{"id":1731,"date":"2025-03-24T08:50:04","date_gmt":"2025-03-23T23:50:04","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1731"},"modified":"2025-03-24T08:50:04","modified_gmt":"2025-03-23T23:50:04","slug":"c%e3%81%aeconst%e3%82%92%e5%ae%8c%e5%85%a8%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%ef%bc%81%e5%ae%9f%e8%b7%b5%e3%81%a7%e4%bd%bf%e3%81%88%e3%82%8b7%e3%81%a4%e3%81%ae%e9%87%8d%e8%a6%81%e3%83%9d%e3%82%a4","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1731","title":{"rendered":"C++\u306econst\u3092\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\uff01\u5b9f\u8df5\u3067\u4f7f\u3048\u308b7\u3064\u306e\u91cd\u8981\u30dd\u30a4\u30f3\u30c8"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">C++\u306b\u304a\u3051\u308bconst\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">const\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u679c\u305f\u30593\u3064\u306e\u91cd\u8981\u306a\u5f79\u5272<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">const\u3092\u4f7f\u7528\u3057\u306a\u3044\u5834\u5408\u306e\u6f5c\u5728\u7684\u306a\u30ea\u30b9\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">const\u30dd\u30a4\u30f3\u30bf\u3068const\u53c2\u7167\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">const T* vs T* const vs const T* const\u306e\u4f7f\u3044\u5206\u3051<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-5\">\u53c2\u7167\u3068\u30dd\u30a4\u30f3\u30bf\u3067const\u306e\u52d5\u4f5c\u304c\u5909\u308f\u308b\u30b1\u30fc\u30b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-6\">\u30e1\u30f3\u30d0\u95a2\u6570\u3067\u306econst\u6307\u5b9a\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-7\">const\u30e1\u30f3\u30d0\u95a2\u6570\u304c\u5fc5\u8981\u306a\u7406\u7531<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-8\">mutable\u6307\u5b9a\u5b50\u3068\u306e\u95a2\u4fc2\u6027\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-9\">constexpr \u3068 const \u306e\u4f7f\u3044\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-10\">\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u5b9a\u6570\u304c\u5fc5\u8981\u306a\u30b1\u30fc\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">\u5b9f\u884c\u6642\u5b9a\u6570\u3067\u5341\u5206\u306a\u5834\u5408\u306e\u5224\u65ad\u57fa\u6e96<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068const\u306e\u95a2\u4fc2\u6027<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\u3068const\u306e\u5f71\u97ff<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-14\">\u5b9f\u884c\u901f\u5ea6\u5411\u4e0a\u306e\u305f\u3081\u306e\u65b0\u3057\u3044const\u6d3b\u7528\u8853<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-15\">\u30e2\u30c0\u30f3C++\u306b\u304a\u3051\u308bconst\u306e\u4f7f\u3044\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-16\">\u30e9\u30e0\u30c0\u5f0f\u3067\u306econst\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-17\">range-based for\u30eb\u30fc\u30d7\u3067\u306econst<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-18\">\u5b9f\u8df5\u7684\u306aconst\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3\u96c6<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-19\">\u3088\u304f\u3042\u308b\u30d0\u30b0\u3092\u9632\u3050\u305f\u3081\u306econst\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-20\">\u5927\u898f\u6a21\u958b\u767a\u3067\u306econst\u898f\u7d04\u306e\u4f5c\u308a\u65b9<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">C++\u306b\u304a\u3051\u308bconst\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<p>const\u306f\u3001C++\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u6700\u3082\u91cd\u8981\u306a\u30ad\u30fc\u30ef\u30fc\u30c9\u306e1\u3064\u3067\u3059\u3002\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u3001\u30d0\u30b0\u3092\u672a\u7136\u306b\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001const\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3068\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">const\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u679c\u305f\u30593\u3064\u306e\u91cd\u8981\u306a\u5f79\u5272<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5024\u306e\u4e0d\u5909\u6027\u306e\u4fdd\u8a3c<\/strong><\/li>\n<\/ol>\n\n\n\n<p>const\u306f\u3001\u5909\u6570\u306e\u5024\u304c\u5909\u66f4\u3055\u308c\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4e88\u6e2c\u53ef\u80fd\u6027\u304c\u5411\u4e0a\u3057\u3001\u610f\u56f3\u3057\u306a\u3044\u5909\u66f4\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">const int MAX_ATTEMPTS = 3;  \/\/ \u5b9a\u6570\u3068\u3057\u3066\u5ba3\u8a00\nMAX_ATTEMPTS = 4;           \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u5024\u306e\u5909\u66f4\u306f\u4e0d\u53ef\n\n\/\/ \u914d\u5217\u3067\u306e\u4f7f\u7528\u4f8b\nconst int VALID_SCORES[] = {80, 85, 90, 95, 100};\nVALID_SCORES[0] = 75;      \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u914d\u5217\u8981\u7d20\u306e\u5909\u66f4\u306f\u4e0d\u53ef<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u95a2\u6570\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u4fdd\u8b77<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u95a2\u6570\u30d1\u30e9\u30e1\u30fc\u30bf\u3092const\u3067\u4fee\u98fe\u3059\u308b\u3053\u3068\u3067\u3001\u95a2\u6570\u5185\u3067\u306e\u8aa4\u3063\u305f\u5909\u66f4\u3092\u9632\u304e\u3001\u610f\u56f3\u3092\u660e\u78ba\u306b\u793a\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f const \u53c2\u7167\u3067\u6e21\u3059\nvoid processUser(const User&amp; user) {\n    std::cout &lt;&lt; user.getName();  \/\/ \u8aad\u307f\u53d6\u308a\u306f\u53ef\u80fd\n    user.setAge(25);             \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u5909\u66f4\u306f\u4e0d\u53ef\n}\n\n\/\/ \u914d\u5217\u3084\u30dd\u30a4\u30f3\u30bf\u3092 const \u3067\u4fdd\u8b77\nvoid printArray(const int* arr, size_t size) {\n    for (size_t i = 0; i &lt; size; ++i) {\n        std::cout &lt;&lt; arr[i];     \/\/ \u8aad\u307f\u53d6\u308a\u306f\u53ef\u80fd\n        arr[i] = 0;              \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u5909\u66f4\u306f\u4e0d\u53ef\n    }\n}<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u8a2d\u8a08\u3068\u30ab\u30d7\u30bb\u30eb\u5316\u306e\u5f37\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<p>const\u30e1\u30f3\u30d0\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u3092\u5909\u66f4\u3057\u306a\u3044\u64cd\u4f5c\u3092\u660e\u793a\u7684\u306b\u793a\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class BankAccount {\npublic:\n    \/\/ \u6b8b\u9ad8\u7167\u4f1a\uff1a\u72b6\u614b\u3092\u5909\u66f4\u3057\u306a\u3044\u306e\u3067const\n    double getBalance() const {\n        return balance;\n    }\n\n    \/\/ \u5165\u91d1\uff1a\u72b6\u614b\u3092\u5909\u66f4\u3059\u308b\u306e\u3067const\u306b\u3057\u306a\u3044\n    void deposit(double amount) {\n        balance += amount;\n    }\n\nprivate:\n    double balance;\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">const\u3092\u4f7f\u7528\u3057\u306a\u3044\u5834\u5408\u306e\u6f5c\u5728\u7684\u306a\u30ea\u30b9\u30af<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u610f\u56f3\u3057\u306a\u3044\u5909\u66f4\u306b\u3088\u308b\u30d0\u30b0<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">void updateScore(int* score) {  \/\/ const\u3092\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044\u5371\u967a\u306a\u4f8b\n    *score = *score * 2;        \/\/ \u8aa4\u3063\u3066\u5024\u30922\u500d\u306b\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\n}\n\n\/\/ \u3088\u308a\u5b89\u5168\u306a\u8a2d\u8a08\nvoid calculateScore(const int* input, int* output) {\n    *output = *input * 2;       \/\/ \u5165\u529b\u306f\u4fdd\u8b77\u3055\u308c\u3001\u51fa\u529b\u306f\u660e\u793a\u7684\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u4e26\u884c\u51e6\u7406\u3067\u306e\u554f\u984c<\/strong><\/li>\n<\/ol>\n\n\n\n<p>const\u3092\u4f7f\u7528\u3057\u306a\u3044\u3068\u3001\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u540c\u3058\u30c7\u30fc\u30bf\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u306b\u4e88\u671f\u3057\u306a\u3044\u52d5\u4f5c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class SharedResource {\n    std::vector&lt;int&gt; data;\npublic:\n    \/\/ \u5371\u967a\uff1aconst\u304c\u306a\u3044\u305f\u3081\u3001\u8aad\u307f\u53d6\u308a\u64cd\u4f5c\u304c\u66f8\u304d\u8fbc\u307f\u3092\u884c\u3046\u53ef\u80fd\u6027\n    std::vector&lt;int&gt;&amp; getData() {\n        return data;\n    }\n\n    \/\/ \u5b89\u5168\uff1aconst\u306b\u3088\u3063\u3066\u8aad\u307f\u53d6\u308a\u5c02\u7528\u3067\u3042\u308b\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u308b\n    const std::vector&lt;int&gt;&amp; getData() const {\n        return data;\n    }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u4e0d\u660e\u78ba\u306b\u306a\u308b\u30ea\u30b9\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u610f\u56f3\u304c\u4e0d\u660e\u78ba\u306a\u8a2d\u8a08\nvoid processConfig(Configuration* config) {\n    \/\/ config\u3092\u5909\u66f4\u3059\u308b\u306e\u304b\u3001\u53c2\u7167\u3059\u308b\u3060\u3051\u306a\u306e\u304b\u4e0d\u660e\u78ba\n}\n\n\/\/ \u610f\u56f3\u304c\u660e\u78ba\u306a\u8a2d\u8a08\nvoid processConfig(const Configuration* config) {\n    \/\/ config\u306f\u53c2\u7167\u3059\u308b\u3060\u3051\u3067\u5909\u66f4\u3057\u306a\u3044\u3053\u3068\u304c\u660e\u78ba\n}<\/pre>\n\n\n\n<p>const\u3092\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u308c\u3089\u306e\u30ea\u30b9\u30af\u3092\u5927\u5e45\u306b\u8efd\u6e1b\u3057\u3001\u3088\u308a\u5b89\u5168\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u5927\u898f\u6a21\u306a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3084\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306f\u3001const\u306e\u4f7f\u7528\u306f\u5fc5\u9808\u306e\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">const\u30dd\u30a4\u30f3\u30bf\u3068const\u53c2\u7167\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b<\/h2>\n\n\n\n<p>C++\u306b\u304a\u3051\u308bconst\u30dd\u30a4\u30f3\u30bf\u3068\u53c2\u7167\u306e\u4f7f\u3044\u5206\u3051\u306f\u3001\u30e1\u30e2\u30ea\u5b89\u5168\u6027\u3068\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u3092\u660e\u78ba\u306b\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u5fb4\u3068\u9069\u5207\u306a\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">const T* vs T* const vs const T* const\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>const T* \uff08\u30c7\u30fc\u30bf\u304cconst\uff09<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u30dd\u30a4\u30f3\u30bf\u304c\u6307\u3059\u5148\u306e\u30c7\u30fc\u30bf\u3092\u5909\u66f4\u3067\u304d\u306a\u3044\u3001\u3057\u304b\u3057\u30dd\u30a4\u30f3\u30bf\u81ea\u4f53\u306f\u5225\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u305b\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">int value1 = 10;\nint value2 = 20;\nconst int* ptr = &amp;value1;  \/\/ \u30c7\u30fc\u30bf\u3092const\u3068\u3057\u3066\u6271\u3046\u30dd\u30a4\u30f3\u30bf\n\n*ptr = 30;                 \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u30c7\u30fc\u30bf\u306e\u5909\u66f4\u4e0d\u53ef\nptr = &amp;value2;            \/\/ OK\uff1a\u30dd\u30a4\u30f3\u30bf\u306f\u5225\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u305b\u308b\n\n\/\/ \u3088\u304f\u3042\u308b\u4f7f\u7528\u4f8b\uff1a\u914d\u5217\u306e\u8d70\u67fb\nvoid printArray(const int* arr, size_t size) {\n    \/\/ arr\u306e\u8981\u7d20\u306f\u8aad\u307f\u53d6\u308a\u5c02\u7528\n    for (size_t i = 0; i &lt; size; ++i) {\n        std::cout &lt;&lt; arr[i] &lt;&lt; \" \";\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>T* const \uff08\u30dd\u30a4\u30f3\u30bf\u304cconst\uff09<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u30dd\u30a4\u30f3\u30bf\u81ea\u4f53\u304c\u56fa\u5b9a\u3055\u308c\u3001\u5225\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u305b\u307e\u305b\u3093\u304c\u3001\u30c7\u30fc\u30bf\u306f\u5909\u66f4\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">int value1 = 10;\nint value2 = 20;\nint* const ptr = &amp;value1;  \/\/ \u30dd\u30a4\u30f3\u30bf\u81ea\u4f53\u3092const\u306b\n\n*ptr = 30;                 \/\/ OK\uff1a\u30c7\u30fc\u30bf\u306e\u5909\u66f4\u53ef\u80fd\nptr = &amp;value2;            \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u30dd\u30a4\u30f3\u30bf\u306f\u56fa\u5b9a\n\n\/\/ \u3088\u304f\u3042\u308b\u4f7f\u7528\u4f8b\uff1a\u56fa\u5b9a\u30d0\u30c3\u30d5\u30a1\u306e\u7ba1\u7406\nclass Buffer {\n    int* const data;  \/\/ \u30d0\u30c3\u30d5\u30a1\u30dd\u30a4\u30f3\u30bf\u306f\u5909\u66f4\u4e0d\u53ef\npublic:\n    Buffer(size_t size) : data(new int[size]) {}\n    ~Buffer() { delete[] data; }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>const T* const \uff08\u4e21\u65b9\u304cconst\uff09<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u30dd\u30a4\u30f3\u30bf\u3082\u30c7\u30fc\u30bf\u3082\u5909\u66f4\u3067\u304d\u306a\u3044\u3001\u5b8c\u5168\u306a\u8aad\u307f\u53d6\u308a\u5c02\u7528\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">int value = 10;\nconst int* const ptr = &amp;value;  \/\/ \u30c7\u30fc\u30bf\u3082\u30dd\u30a4\u30f3\u30bf\u3082const\n\n*ptr = 20;                      \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u30c7\u30fc\u30bf\u5909\u66f4\u4e0d\u53ef\nptr = &amp;other_value;            \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u30dd\u30a4\u30f3\u30bf\u5909\u66f4\u4e0d\u53ef\n\n\/\/ \u3088\u304f\u3042\u308b\u4f7f\u7528\u4f8b\uff1a\u5171\u6709\u30ea\u30bd\u30fc\u30b9\u306e\u4fdd\u8b77\nclass SharedResource {\n    const int* const readOnlyData;\npublic:\n    SharedResource(const int* data) : readOnlyData(data) {}\n    \/\/ \u30c7\u30fc\u30bf\u306e\u8aad\u307f\u53d6\u308a\u306e\u307f\u53ef\u80fd\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u53c2\u7167\u3068\u30dd\u30a4\u30f3\u30bf\u3067const\u306e\u52d5\u4f5c\u304c\u5909\u308f\u308b\u30b1\u30fc\u30b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>const\u53c2\u7167\u306e\u7279\u5fb4<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u53c2\u7167\u306f\u672c\u8cea\u7684\u306b\u30dd\u30a4\u30f3\u30bf\u306e\u3088\u3046\u306a\u518d\u4ee3\u5165\u304c\u3067\u304d\u306a\u3044\u305f\u3081\u3001const\u306e\u610f\u5473\u304c\u30c7\u30fc\u30bf\u306e\u4fdd\u8b77\u306e\u307f\u306b\u9650\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">int value = 10;\nconst int&amp; ref = value;  \/\/ const\u53c2\u7167\n\nref = 20;               \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u30c7\u30fc\u30bf\u5909\u66f4\u4e0d\u53ef\n\/\/ \u53c2\u7167\u81ea\u4f53\u306e\u5909\u66f4\u3068\u3044\u3046\u6982\u5ff5\u306f\u306a\u3044\uff08\u521d\u671f\u5316\u6642\u306b\u675f\u7e1b\u3055\u308c\u308b\uff09\n\n\/\/ \u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5bff\u547d\u5ef6\u9577\nconst std::string&amp; str = std::string(\"temp\");  \/\/ OK\uff1a\u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5bff\u547d\u304c\u5ef6\u9577\u3055\u308c\u308b\nstd::string&amp; nonConstRef = std::string(\"temp\"); \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u975econst\u53c2\u7167\u3067\u306f\u4e0d\u53ef<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u53c2\u7167\u3068\u30dd\u30a4\u30f3\u30bf\u306e\u9078\u629e\u57fa\u6e96<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class HeavyObject {\n    \/\/ \u5927\u91cf\u306e\u30c7\u30fc\u30bf\n};\n\n\/\/ \u63a8\u5968\uff1a\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306fconst\u53c2\u7167\u3067\u6e21\u3059\nvoid processObject(const HeavyObject&amp; obj) {\n    \/\/ obj\u306f\u5909\u66f4\u4e0d\u53ef\u3060\u304c\u3001\u30b3\u30d4\u30fc\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3082\u306a\u3044\n}\n\n\/\/ \u975e\u63a8\u5968\uff1a\u4e0d\u5fc5\u8981\u306a\u30b3\u30d4\u30fc\u304c\u767a\u751f\nvoid processObjectBad(HeavyObject obj) {\n    \/\/ obj\u306f\u30b3\u30d4\u30fc\u3055\u308c\u308b\n}\n\n\/\/ \u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u3046\u3079\u304d\u5834\u5408\uff1anullable\u306a\u5024\u3092\u6271\u3046\nvoid processOptionalObject(const HeavyObject* obj) {\n    if (obj) {  \/\/ null\u30c1\u30a7\u30c3\u30af\u304c\u53ef\u80fd\n        \/\/ \u51e6\u7406\n    }\n}<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u3088\u304f\u3042\u308b\u8aa4\u308a\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u4e0d\u5fc5\u8981\u306a\u30dd\u30a4\u30f3\u30bf\u306e\u4f7f\u7528\nvoid printString(const std::string* str) {\n    std::cout &lt;&lt; *str;  \/\/ \u9593\u63a5\u53c2\u7167\u304c\u5fc5\u8981\n}\n\n\/\/ \u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a\u5358\u7d14\u306a\u8aad\u307f\u53d6\u308a\u306b\u306fconst\u53c2\u7167\u3092\u4f7f\u7528\nvoid printString(const std::string&amp; str) {\n    std::cout &lt;&lt; str;   \/\/ \u30b7\u30f3\u30d7\u30eb\u3067\u5b89\u5168\n}\n\n\/\/ \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u64cd\u4f5c\nclass DataManager {\n    std::vector&lt;int&gt; data;\npublic:\n    \/\/ \u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a\u8aad\u307f\u53d6\u308a\u5c02\u7528\u30a2\u30af\u30bb\u30b9\u306fconst\u53c2\u7167\u3092\u8fd4\u3059\n    const std::vector&lt;int&gt;&amp; getData() const {\n        return data;\n    }\n\n    \/\/ \u5909\u66f4\u53ef\u80fd\u306a\u30a2\u30af\u30bb\u30b9\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u975econst\u53c2\u7167\u3092\u8fd4\u3059\n    std::vector&lt;int&gt;&amp; getData() {\n        return data;\n    }\n};<\/pre>\n\n\n\n<p>const\u30dd\u30a4\u30f3\u30bf\u3068\u53c2\u7167\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051\u306f\u3001\u30b3\u30fc\u30c9\u306e\u5b89\u5168\u6027\u3068\u610f\u56f3\u306e\u660e\u78ba\u3055\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u307e\u3059\u3002\u7279\u306b\u3001const\u53c2\u7167\u306f\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u52b9\u7387\u7684\u306a\u53d7\u3051\u6e21\u3057\u306b\u6700\u9069\u3067\u3042\u308b\u4e00\u65b9\u3001\u30dd\u30a4\u30f3\u30bf\u306fnull\u306e\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u30e2\u30c0\u30f3C++\u3067\u306f\u3001\u53ef\u80fd\u306a\u9650\u308a\u30dd\u30a4\u30f3\u30bf\u3088\u308a\u3082\u53c2\u7167\u3092\u4f7f\u7528\u3057\u3001const\u3092\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-6\">\u30e1\u30f3\u30d0\u95a2\u6570\u3067\u306econst\u6307\u5b9a\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n\n\n<p>const\u30e1\u30f3\u30d0\u95a2\u6570\u306f\u3001C++\u306b\u304a\u3051\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001const\u30e1\u30f3\u30d0\u95a2\u6570\u306e\u9069\u5207\u306a\u4f7f\u7528\u65b9\u6cd5\u3068\u3001mutable\u6307\u5b9a\u5b50\u3068\u306e\u95a2\u4fc2\u6027\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">const\u30e1\u30f3\u30d0\u95a2\u6570\u304c\u5fc5\u8981\u306a\u7406\u7531<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u4fdd\u8b77<\/strong><\/li>\n<\/ol>\n\n\n\n<p>const\u30e1\u30f3\u30d0\u95a2\u6570\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u3092\u5909\u66f4\u3057\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4e88\u671f\u3057\u306a\u3044\u526f\u4f5c\u7528\u3092\u9632\u304e\u3001\u30b3\u30fc\u30c9\u306e\u5b89\u5168\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class BankAccount {\n    double balance;\npublic:\n    \/\/ \u6b8b\u9ad8\u7167\u4f1a\uff1a\u72b6\u614b\u3092\u5909\u66f4\u3057\u306a\u3044\u306e\u3067const\n    double getBalance() const {\n        return balance;\n    }\n\n    \/\/ \u53d6\u5f15\u5c65\u6b74\u306e\u8ffd\u52a0\uff1a\u72b6\u614b\u3092\u5909\u66f4\u3059\u308b\u306e\u3067const\u306b\u3057\u306a\u3044\n    void addTransaction(const Transaction&amp; t) {\n        transactions.push_back(t);\n    }\nprivate:\n    std::vector&lt;Transaction&gt; transactions;\n};\n\nvoid printBalance(const BankAccount&amp; account) {\n    \/\/ const\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306fconst\u30e1\u30f3\u30d0\u95a2\u6570\u306e\u307f\u547c\u3073\u51fa\u3057\u53ef\u80fd\n    std::cout &lt;&lt; account.getBalance();  \/\/ OK\n    account.addTransaction(t);          \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u4e26\u884c\u51e6\u7406\u3067\u306e\u5b89\u5168\u6027\u78ba\u4fdd<\/strong><\/li>\n<\/ol>\n\n\n\n<p>const\u30e1\u30f3\u30d0\u95a2\u6570\u306f\u3001\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u306e\u5b89\u5168\u306a\u8aad\u307f\u53d6\u308a\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ThreadSafeCounter {\n    mutable std::mutex mtx;  \/\/ \u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u306fmutable\u3068\u3057\u3066\u5ba3\u8a00\n    int value;\npublic:\n    \/\/ \u8aad\u307f\u53d6\u308a\u64cd\u4f5c\u306fconst\u3060\u304c\u3001\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u306e\u30ed\u30c3\u30af\u304c\u5fc5\u8981\n    int getValue() const {\n        std::lock_guard&lt;std::mutex&gt; lock(mtx);\n        return value;\n    }\n\n    \/\/ \u66f8\u304d\u8fbc\u307f\u64cd\u4f5c\u306f\u975econst\n    void increment() {\n        std::lock_guard&lt;std::mutex&gt; lock(mtx);\n        ++value;\n    }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u660e\u78ba\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<p>const\u30e1\u30f3\u30d0\u95a2\u6570\u3092\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u3088\u308a\u660e\u78ba\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DataAnalyzer {\npublic:\n    \/\/ \u89e3\u6790\u7d50\u679c\u306e\u53d6\u5f97\uff1a\u30c7\u30fc\u30bf\u3092\u5909\u66f4\u3057\u306a\u3044\n    std::vector&lt;Result&gt; getResults() const {\n        return results;\n    }\n\n    \/\/ \u30c7\u30fc\u30bf\u306e\u8ffd\u52a0\uff1a\u72b6\u614b\u3092\u5909\u66f4\u3059\u308b\n    void addData(const Data&amp; newData) {\n        data.push_back(newData);\n        results.clear();  \/\/ \u7d50\u679c\u3092\u30af\u30ea\u30a2\n    }\n\n    \/\/ \u89e3\u6790\u306e\u5b9f\u884c\uff1a\u5185\u90e8\u72b6\u614b\u3092\u5909\u66f4\u3059\u308b\n    void analyze() {\n        results = performAnalysis(data);\n    }\nprivate:\n    std::vector&lt;Data&gt; data;\n    std::vector&lt;Result&gt; results;\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">mutable\u6307\u5b9a\u5b50\u3068\u306e\u95a2\u4fc2\u6027\u3092\u7406\u89e3\u3059\u308b<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<p>mutable\u306f\u3001const\u30e1\u30f3\u30d0\u95a2\u6570\u5185\u3067\u3082\u5909\u66f4\u53ef\u80fd\u306a\u5909\u6570\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u4e3b\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3084\u9045\u5ef6\u8a08\u7b97\u306e\u5b9f\u88c5\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ComplexCalculator {\n    mutable std::optional&lt;double&gt; cachedResult;\n    mutable std::mutex cacheMutex;\n    const double input;\n\npublic:\n    ComplexCalculator(double in) : input(in) {}\n\n    \/\/ \u91cd\u3044\u8a08\u7b97\u7d50\u679c\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\n    double getResult() const {\n        std::lock_guard&lt;std::mutex&gt; lock(cacheMutex);\n        if (!cachedResult) {\n            cachedResult = performHeavyCalculation(input);\n        }\n        return *cachedResult;\n    }\nprivate:\n    double performHeavyCalculation(double x) const {\n        \/\/ \u91cd\u3044\u8a08\u7b97\u51e6\u7406\n        return x * x;  \/\/ \u7c21\u7565\u5316\u3057\u305f\u4f8b\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30ed\u30ae\u30f3\u30b0\u3068\u76e3\u8996<\/strong><\/li>\n<\/ol>\n\n\n\n<p>mutable\u3092\u4f7f\u7528\u3057\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u3092\u5909\u66f4\u305b\u305a\u306b\u76e3\u8996\u3084\u30ed\u30ae\u30f3\u30b0\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class SecureDocument {\n    std::string content;\n    mutable std::vector&lt;LogEntry&gt; accessLog;\n    mutable std::mutex logMutex;\n\npublic:\n    \/\/ \u5185\u5bb9\u306e\u8aad\u307f\u53d6\u308a\u6642\u306b\u30ed\u30b0\u3092\u8a18\u9332\n    std::string getContent() const {\n        logAccess();  \/\/ const\u30e1\u30f3\u30d0\u95a2\u6570\u5185\u3067\u30ed\u30b0\u3092\u8a18\u9332\n        return content;\n    }\n\nprivate:\n    void logAccess() const {\n        std::lock_guard&lt;std::mutex&gt; lock(logMutex);\n        accessLog.push_back(LogEntry{\n            std::chrono::system_clock::now(),\n            \"content accessed\"\n        });\n    }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>mutable\u306e\u4f7f\u7528\u306b\u95a2\u3059\u308b\u6ce8\u610f\u70b9<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DataManager {\n    mutable int accessCount = 0;\n    std::vector&lt;int&gt; data;\n\npublic:\n    \/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1amutable\u306e\u904e\u5270\u4f7f\u7528\n    void modifyData() const {  \/\/ const\u306a\u306e\u306b\u72b6\u614b\u3092\u5909\u66f4\u3057\u3066\u3044\u308b\n        ++accessCount;  \/\/ OK: mutable\u306a\u306e\u3067const\u30e1\u30f3\u30d0\u95a2\u6570\u3067\u5909\u66f4\u53ef\u80fd\n        data.push_back(42);  \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc: data\u306fmutable\u3067\u306f\u306a\u3044\n    }\n\n    \/\/ \u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1aconst\u6027\u3092\u9069\u5207\u306b\u4f7f\u7528\n    void addData(int value) {  \/\/ \u975econst\u3067\u72b6\u614b\u3092\u5909\u66f4\n        data.push_back(value);\n        ++accessCount;\n    }\n\n    int getAccessCount() const {  \/\/ \u8aad\u307f\u53d6\u308a\u306e\u307f\n        return accessCount;\n    }\n};<\/pre>\n\n\n\n<p>const\u30e1\u30f3\u30d0\u95a2\u6570\u3068mutable\u306e\u9069\u5207\u306a\u7d44\u307f\u5408\u308f\u305b\u306f\u3001\u30af\u30e9\u30b9\u306e\u8a2d\u8a08\u3092\u6539\u5584\u3057\u3001\u30b3\u30fc\u30c9\u306e\u4fdd\u5b88\u6027\u3068\u5b89\u5168\u6027\u3092\u9ad8\u3081\u307e\u3059\u3002\u305f\u3060\u3057\u3001mutable\u306e\u4f7f\u7528\u306f\u5fc5\u8981\u6700\u5c0f\u9650\u306b\u7559\u3081\u3001\u4e3b\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3084\u30ed\u30ae\u30f3\u30b0\u306a\u3069\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8ad6\u7406\u7684\u306a\u72b6\u614b\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u306a\u3044\u7528\u9014\u306b\u9650\u5b9a\u3059\u3079\u304d\u3067\u3059\u3002\u9069\u5207\u306a\u4f7f\u7528\u306b\u3088\u308a\u3001\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30b3\u30fc\u30c9\u306e\u4f5c\u6210\u3084\u3001\u52b9\u7387\u7684\u306a\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-9\">constexpr \u3068 const \u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>constexpr\u306f\u3001C++11\u3067\u5c0e\u5165\u3055\u308c\u305f\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u5b9a\u6570\u8a55\u4fa1\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001constexpr\u306e\u9069\u5207\u306a\u4f7f\u7528\u65b9\u6cd5\u3068\u3001\u5f93\u6765\u306econst\u3068\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u5b9a\u6570\u304c\u5fc5\u8981\u306a\u30b1\u30fc\u30b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u914d\u5217\u30b5\u30a4\u30ba\u306e\u6307\u5b9a<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u5024\u304c\u78ba\u5b9a\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u9762\u3067\u306f\u3001constexpr\u304c\u5fc5\u9808\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a55\u4fa1\u3055\u308c\u308b\u95a2\u6570\nconstexpr int calculateArraySize(int base) {\n    return base * 2 + 1;\n}\n\n\/\/ \u914d\u5217\u30b5\u30a4\u30ba\u3068\u3057\u3066constexpr\u95a2\u6570\u3092\u4f7f\u7528\nconstexpr int size = calculateArraySize(5);\nint array[size];  \/\/ OK: \u30b5\u30a4\u30ba\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u6c7a\u5b9a\n\n\/\/ \u4ee5\u4e0b\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\nint runtime_value = 10;\nconst int const_size = runtime_value * 2;  \/\/ \u5b9f\u884c\u6642\u306b\u8a55\u4fa1\n\/\/ int array2[const_size];  \/\/ \u30a8\u30e9\u30fc\uff1a\u30b5\u30a4\u30ba\u306f\u5b9f\u884c\u6642\u306b\u6c7a\u5b9a<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u975e\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u306f\u3001constexpr\u5024\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">template&lt;int Size&gt;\nclass FixedBuffer {\n    int data[Size];\npublic:\n    constexpr int getSize() const {\n        return Size;\n    }\n};\n\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a55\u4fa1\u3055\u308c\u308b\nconstexpr int bufferSize = 100;\nFixedBuffer&lt;bufferSize&gt; buffer;  \/\/ OK\n\nconst int runtime_size = 100;  \/\/ \u5b9f\u884c\u6642\u306b\u8a55\u4fa1\n\/\/ FixedBuffer&lt;runtime_size&gt; buffer2;  \/\/ \u30a8\u30e9\u30fc<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u6700\u9069\u5316\u306e\u305f\u3081\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u8a08\u7b97<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a08\u7b97\u3055\u308c\u308b\u6570\u5b66\u95a2\u6570\nconstexpr double power(double base, int exponent) {\n    return exponent == 0 ? 1 :\n           exponent &gt; 0 ? base * power(base, exponent - 1) :\n           1 \/ power(base, -exponent);\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nconstexpr double preCalculated = power(2.0, 10);  \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a08\u7b97<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u5b9f\u884c\u6642\u5b9a\u6570\u3067\u5341\u5206\u306a\u5834\u5408\u306e\u5224\u65ad\u57fa\u6e96<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u4f7f\u7528\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u8003\u616e<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ConfigManager {\n    \/\/ \u5b9f\u884c\u6642\u306b\u5024\u304c\u6c7a\u5b9a\u3055\u308c\u308b\u5b9a\u6570\n    const std::string configPath;\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u5b9a\u6570\n    constexpr static int MAX_RETRIES = 3;\n\npublic:\n    ConfigManager(const std::string&amp; path) \n        : configPath(path) {}  \/\/ \u5b9f\u884c\u6642\u306e\u521d\u671f\u5316\u3067OK\n\n    constexpr int getMaxRetries() const {\n        return MAX_RETRIES;\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u52d5\u7684\u306a\u5024\u306e\u6271\u3044<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class NetworkSettings {\n    const int port;        \/\/ \u5b9f\u884c\u6642\u306b\u6c7a\u5b9a\u3055\u308c\u308b\u5b9a\u6570\n    const std::string host;  \/\/ \u5b9f\u884c\u6642\u306b\u6c7a\u5b9a\u3055\u308c\u308b\u5b9a\u6570\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u5b9a\u6570\u3068\u3057\u3066\u9069\u5207\u306a\u5024\n    constexpr static int DEFAULT_PORT = 8080;\n    constexpr static int MAX_CONNECTIONS = 100;\n\npublic:\n    NetworkSettings(int p, const std::string&amp; h)\n        : port(p), host(h) {}\n\n    \/\/ constexpr\u3068const\u306e\u4f7f\u3044\u5206\u3051\n    constexpr static int getMaxConnections() {\n        return MAX_CONNECTIONS;\n    }\n\n    const std::string&amp; getHost() const {\n        return host;\n    }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>constexpr\u95a2\u6570\u306e\u8a2d\u8a08<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u3068\u5b9f\u884c\u6642\u306e\u4e21\u65b9\u3067\u4f7f\u3048\u308b\u95a2\u6570\nconstexpr int fibonacci(int n) {\n    return n &lt;= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nconstexpr int compile_time_fib = fibonacci(10);  \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a08\u7b97\n\nint runtime_n = getUserInput();  \/\/ \u5b9f\u884c\u6642\u306b\u5024\u3092\u53d6\u5f97\nint runtime_fib = fibonacci(runtime_n);  \/\/ \u5b9f\u884c\u6642\u306b\u8a08\u7b97\n\n\/\/ constexpr\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4f8b\nclass Point {\n    int x, y;\npublic:\n    constexpr Point(int x_, int y_) : x(x_), y(y_) {}\n\n    constexpr int getX() const { return x; }\n    constexpr int getY() const { return y; }\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a08\u7b97\u53ef\u80fd\u306a\u64cd\u4f5c\n    constexpr Point operator+(const Point&amp; other) const {\n        return Point(x + other.x, y + other.y);\n    }\n};<\/pre>\n\n\n\n<p>constexpr\u3068const\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051\u306f\u3001\u4ee5\u4e0b\u306e\u57fa\u6e96\u3067\u5224\u65ad\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u5024\u304c\u5fc5\u8981\u306a\u5834\u5408\uff08\u914d\u5217\u30b5\u30a4\u30ba\u3001\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306a\u3069\uff09\uff1aconstexpr<\/li>\n\n\n\n<li>\u5b9f\u884c\u6642\u306b\u5024\u304c\u6c7a\u5b9a\u3055\u308c\u308b\u5834\u5408\uff08\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u3001\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u306a\u3069\uff09\uff1aconst<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u91cd\u8981\u306a\u5834\u5408\uff1a\u53ef\u80fd\u306a\u9650\u308aconstexpr<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u61f8\u5ff5\u3055\u308c\u308b\u5834\u5408\uff1a\u72b6\u6cc1\u306b\u5fdc\u3058\u3066const\u3092\u4f7f\u7528<\/li>\n<\/ol>\n\n\n\n<p>constexpr\u3092\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u6700\u9069\u5316\u304c\u53ef\u80fd\u306b\u306a\u308a\u3001\u5b9f\u884c\u6642\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u904e\u5270\u306a\u4f7f\u7528\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u9593\u306e\u5897\u52a0\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u9069\u5207\u306a\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068const\u306e\u95a2\u4fc2\u6027<\/h2>\n\n\n\n<p>const\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u5358\u306a\u308b\u5236\u7d04\u3067\u306f\u306a\u304f\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u91cd\u8981\u306a\u6700\u9069\u5316\u306e\u6a5f\u4f1a\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001const\u304c\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u4e0e\u3048\u308b\u5f71\u97ff\u3068\u3001\u305d\u306e\u6d3b\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\u3068const\u306e\u5f71\u97ff<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a4\u30f3\u30e9\u30a4\u30f3\u5316\u306e\u4fc3\u9032<\/strong><\/li>\n<\/ol>\n\n\n\n<p>const\u30e1\u30f3\u30d0\u95a2\u6570\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u3088\u308a\u7a4d\u6975\u7684\u306b\u30a4\u30f3\u30e9\u30a4\u30f3\u5316\u3092\u884c\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class Vector {\n    double x, y, z;\npublic:\n    \/\/ const\u30e1\u30f3\u30d0\u95a2\u6570\u306f\u526f\u4f5c\u7528\u304c\u306a\u3044\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u308b\n    constexpr double getLength() const {\n        return std::sqrt(x*x + y*y + z*z);\n    }\n\n    \/\/ \u975econst\u306e\u5834\u5408\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u614e\u91cd\u306b\u306a\u308b\u5fc5\u8981\u304c\u3042\u308b\n    double modifyAndGetLength() {\n        x += 1.0;  \/\/ \u526f\u4f5c\u7528\u304c\u3042\u308b\n        return std::sqrt(x*x + y*y + z*z);\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid processVectors(const std::vector&lt;Vector&gt;&amp; vectors) {\n    double total = 0.0;\n    \/\/ getLength\u306f\u30a4\u30f3\u30e9\u30a4\u30f3\u5316\u3055\u308c\u3084\u3059\u3044\n    for (const auto&amp; v : vectors) {\n        total += v.getLength();\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u5b9a\u6570\u4f1d\u64ad\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ConfigurationManager {\n    const int maxConnections;\n    const double timeout;\n\npublic:\n    ConfigurationManager(int max, double t)\n        : maxConnections(max), timeout(t) {}\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u5024\u304c\u5909\u66f4\u3055\u308c\u306a\u3044\u3053\u3068\u3092\u77e5\u3063\u3066\u3044\u308b\u305f\u3081\n    \/\/ \u3088\u308a\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c9\u3092\u751f\u6210\u3067\u304d\u308b\n    bool canAcceptConnection(int currentConnections) const {\n        return currentConnections &lt; maxConnections;\n    }\n\n    bool hasTimedOut(double elapsed) const {\n        return elapsed &gt; timeout;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u5b9f\u884c\u901f\u5ea6\u5411\u4e0a\u306e\u305f\u3081\u306e\u65b0\u3057\u3044const\u6d3b\u7528\u8853<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>const\u53c2\u7167\u306b\u3088\u308b\u30b3\u30d4\u30fc\u524a\u6e1b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6bd4\u8f03\n\n\/\/ \u975e\u52b9\u7387\u306a\u5b9f\u88c5\uff1a\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30d4\u30fc\u304c\u767a\u751f\nvoid processDataBad(BigObject obj) {\n    \/\/ obj\u306f\u547c\u3073\u51fa\u3057\u6642\u306b\u30b3\u30d4\u30fc\u3055\u308c\u308b\n}\n\n\/\/ \u52b9\u7387\u7684\u306a\u5b9f\u88c5\uff1aconst\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u3067\u4e0d\u8981\u306a\u30b3\u30d4\u30fc\u3092\u9632\u3050\nvoid processDataGood(const BigObject&amp; obj) {\n    \/\/ \u30b3\u30d4\u30fc\u306f\u767a\u751f\u3057\u306a\u3044\n}\n\n\/\/ \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u4f8b\nBigObject huge_obj(1000000);  \/\/ \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\n\n\/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u9055\u3044\nauto start = std::chrono::high_resolution_clock::now();\nprocessDataBad(huge_obj);    \/\/ \u30b3\u30d4\u30fc\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u5927\u304d\u3044\nauto end = std::chrono::high_resolution_clock::now();\n\nauto start2 = std::chrono::high_resolution_clock::now();\nprocessDataGood(huge_obj);   \/\/ \u30b3\u30d4\u30fc\u306a\u3057\u3067\u9ad8\u901f\nauto end2 = std::chrono::high_resolution_clock::now();<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u4e26\u5217\u51e6\u7406\u3067\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DataProcessor {\n    const std::vector&lt;int&gt; data;  \/\/ \u5909\u66f4\u4e0d\u53ef\u306a\u30c7\u30fc\u30bf\n    mutable std::mutex resultMutex;\n    mutable std::optional&lt;double&gt; cachedResult;\n\npublic:\n    \/\/ const\u30e1\u30f3\u30d0\u95a2\u6570\u306f\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u5b89\u5168\u306b\u547c\u3073\u51fa\u305b\u308b\n    double processData() const {\n        std::lock_guard&lt;std::mutex&gt; lock(resultMutex);\n        if (cachedResult) {\n            return *cachedResult;  \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u3042\u308b\u5834\u5408\u306f\u5373\u5ea7\u306b\u8fd4\u3059\n        }\n\n        \/\/ \u91cd\u3044\u8a08\u7b97\n        double result = 0.0;\n        for (const auto&amp; val : data) {\n            result += std::sqrt(static_cast&lt;double&gt;(val));\n        }\n\n        cachedResult = result;  \/\/ \u7d50\u679c\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\n        return result;\n    }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u6700\u9069\u5316\u306e\u5b9f\u8df5\u4f8b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ RVO (Return Value Optimization) \u3068const\u306e\u7d44\u307f\u5408\u308f\u305b\nclass DataContainer {\n    std::vector&lt;int&gt; data;\n\npublic:\n    \/\/ const\u30e1\u30bd\u30c3\u30c9\u3068RVO\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3088\u308a\u52b9\u7387\u7684\n    const std::vector&lt;int&gt;&amp; getData() const {\n        return data;  \/\/ \u30b3\u30d4\u30fc\u306a\u3057\u3067\u8fd4\u5374\n    }\n\n    \/\/ \u975econst\u306e\u5834\u5408\u3001\u610f\u56f3\u3057\u306a\u3044\u5909\u66f4\u304c\u53ef\u80fd\u306a\u305f\u3081\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u6700\u9069\u5316\u306e\u6a5f\u4f1a\u3092\u5931\u3046\u53ef\u80fd\u6027\u304c\u3042\u308b\n    std::vector&lt;int&gt;&amp; getData() {\n        return data;\n    }\n};\n\n\/\/ const\u6b63\u3057\u3044\u8a2d\u8a08\u306b\u3088\u308b\u6700\u9069\u5316\nclass OptimizedProcessor {\n    const std::unordered_map&lt;std::string, int&gt; lookupTable;\n\npublic:\n    \/\/ const\u306b\u3088\u308a\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u5024\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3084\n    \/\/ \u547d\u4ee4\u306e\u4e26\u3079\u66ff\u3048\u306a\u3069\u306e\u6700\u9069\u5316\u304c\u53ef\u80fd\n    int lookup(const std::string&amp; key) const {\n        auto it = lookupTable.find(key);\n        return it != lookupTable.end() ? it-&gt;second : -1;\n    }\n};<\/pre>\n\n\n\n<p>const\u306e\u9069\u5207\u306a\u4f7f\u7528\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u6700\u9069\u5316\u306e\u6a5f\u4f1a\u3092\u63d0\u4f9b\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3088\u308b\u7a4d\u6975\u7684\u306a\u30a4\u30f3\u30e9\u30a4\u30f3\u5316<\/li>\n\n\n\n<li>\u5b9a\u6570\u4f1d\u64ad\u306b\u3088\u308b\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u30b3\u30d4\u30fc\u306e\u524a\u9664<\/li>\n\n\n\n<li>\u30b9\u30ec\u30c3\u30c9\u5b89\u5168\u6027\u306e\u4fdd\u8a3c\u306b\u3088\u308b\u30ed\u30c3\u30af\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u52b9\u7387\u306e\u5411\u4e0a<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u306f\u3001\u7279\u306b\u4ee5\u4e0b\u306e\u5834\u9762\u3067\u52b9\u679c\u3092\u767a\u63ee\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u51e6\u7406<\/li>\n\n\n\n<li>\u9ad8\u983b\u5ea6\u3067\u547c\u3073\u51fa\u3055\u308c\u308b\u95a2\u6570<\/li>\n\n\n\n<li>\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u4e26\u884c\u51e6\u7406<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u91cd\u8981\u306a\u5834\u9762<\/li>\n<\/ul>\n\n\n\n<p>const\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u5b89\u5168\u6027\u3092\u9ad8\u3081\u306a\u304c\u3089\u3001\u540c\u6642\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3082\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-15\">\u30e2\u30c0\u30f3C++\u306b\u304a\u3051\u308bconst\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>\u30e2\u30c0\u30f3C++\u3067\u306f\u3001const\u306e\u4f7f\u7528\u65b9\u6cd5\u304c\u5f93\u6765\u3088\u308a\u3082\u591a\u69d8\u5316\u3057\u3001\u3088\u308a\u5f37\u529b\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u6700\u65b0\u306eC++\u6a5f\u80fd\u3068const\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u30e9\u30e0\u30c0\u5f0f\u3067\u306econst\u6d3b\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>const\u30e9\u30e0\u30c0\u5f0f\u306e\u57fa\u672c<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DataProcessor {\n    std::vector&lt;int&gt; data;\npublic:\n    \/\/ const\u30e9\u30e0\u30c0\u5f0f\u3092\u8fd4\u3059\u30e1\u30f3\u30d0\u95a2\u6570\n    auto getAnalyzer() const {\n        return [](const auto&amp; value) {\n            return value * 2;  \/\/ \u7d14\u7c8b\u306a\u8a08\u7b97\u306e\u307f\n        };\n    }\n\n    \/\/ \u30ad\u30e3\u30d7\u30c1\u30e3\u3068const\u306e\u7d44\u307f\u5408\u308f\u305b\n    auto getDataAnalyzer() const {\n        \/\/ \u30c7\u30fc\u30bf\u3092const\u53c2\u7167\u3067\u30ad\u30e3\u30d7\u30c1\u30e3\n        return [this](int multiplier) const {\n            int sum = 0;\n            for (const auto&amp; val : data) {\n                sum += val * multiplier;\n            }\n            return sum;\n        };\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>mutable\u30e9\u30e0\u30c0\u3068const\u306e\u4f7f\u3044\u5206\u3051<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class CacheManager {\npublic:\n    \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u7528\u3059\u308b\u30e9\u30e0\u30c0\n    auto createCachedCalculator() {\n        return [cache = std::map&lt;int, int&gt;{}](int value) mutable {\n            auto it = cache.find(value);\n            if (it != cache.end()) {\n                return it-&gt;second;\n            }\n            int result = heavyCalculation(value);\n            cache = result;\n            return result;\n        };\n    }\n\n    \/\/ const\u30e9\u30e0\u30c0\u306b\u3088\u308b\u7d14\u7c8b\u306a\u8a08\u7b97\n    auto createPureCalculator() const {\n        return [](int value) const {\n            return heavyCalculation(value);\n        };\n    }\nprivate:\n    static int heavyCalculation(int value) {\n        return value * value;  \/\/ \u7c21\u7565\u5316\u3057\u305f\u4f8b\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">range-based for\u30eb\u30fc\u30d7\u3067\u306econst<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u52b9\u7387\u7684\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DataContainer {\n    std::vector&lt;BigObject&gt; objects;\npublic:\n    \/\/ const\u306e\u6d3b\u7528\u306b\u3088\u308b\u52b9\u7387\u7684\u306a\u51e6\u7406\n    void processObjects() const {\n        \/\/ const\u53c2\u7167\u306b\u3088\u308b\u52b9\u7387\u7684\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\n        for (const auto&amp; obj : objects) {\n            obj.analyze();  \/\/ const\u30e1\u30f3\u30d0\u95a2\u6570\u306e\u307f\u547c\u3073\u51fa\u3057\u53ef\u80fd\n        }\n    }\n\n    \/\/ \u69cb\u9020\u5316\u675f\u7e1b\u3068const\u306e\u7d44\u307f\u5408\u308f\u305b\n    void analyzeMap() const {\n        std::map&lt;std::string, int&gt; data;\n        for (const auto&amp; [key, value] : data) {\n            std::cout &lt;&lt; key &lt;&lt; \": \" &lt;&lt; value &lt;&lt; '\\n';\n        }\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>views\u3068const\u306e\u7d44\u307f\u5408\u308f\u305b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;ranges&gt;\n\nclass ModernContainer {\n    std::vector&lt;int&gt; numbers;\npublic:\n    \/\/ ranges\u30e9\u30a4\u30d6\u30e9\u30ea\u3068const\u306e\u7d44\u307f\u5408\u308f\u305b\n    auto getEvenNumbers() const {\n        return numbers | std::views::filter([](int n) {\n            return n % 2 == 0;\n        });\n    }\n\n    \/\/ \u8907\u6570\u306eviews\u306e\u7d44\u307f\u5408\u308f\u305b\n    auto getTransformedNumbers() const {\n        return numbers \n            | std::views::filter([](int n) { return n &gt; 0; })\n            | std::views::transform([](int n) { return n * 2; });\n    }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u3068const<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ResourceManager {\n    std::shared_ptr&lt;const BigResource&gt; resource;\npublic:\n    \/\/ const\u3068\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u7d44\u307f\u5408\u308f\u305b\n    void processResource() const {\n        \/\/ resource\u306fconst\u3001\u4e2d\u8eab\u3082\u5909\u66f4\u4e0d\u53ef\n        for (const auto&amp; item : resource-&gt;getData()) {\n            std::cout &lt;&lt; item &lt;&lt; '\\n';\n        }\n    }\n\n    \/\/ std::unique_ptr\u3068const\u306e\u7d44\u307f\u5408\u308f\u305b\n    void transferResource(std::unique_ptr&lt;const BigResource&gt; newResource) {\n        resource = std::move(newResource);\n    }\n};<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>\u30b3\u30f3\u30bb\u30d7\u30c8\u3068const\u306e\u7d44\u307f\u5408\u308f\u305b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">template&lt;typename T&gt;\nconcept Processable = requires(const T&amp; t) {\n    { t.process() } -&gt; std::same_as&lt;void&gt;;\n    { t.isValid() const } -&gt; std::same_as&lt;bool&gt;;\n};\n\ntemplate&lt;Processable T&gt;\nclass ModernProcessor {\n    T data;\npublic:\n    \/\/ \u30b3\u30f3\u30bb\u30d7\u30c8\u306b\u3088\u308b\u5236\u7d04\u3068const\u306e\u7d44\u307f\u5408\u308f\u305b\n    bool validateData() const {\n        return data.isValid();  \/\/ const\u30e1\u30f3\u30d0\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\n    }\n\n    void processData() {\n        if (validateData()) {\n            data.process();\n        }\n    }\n};<\/pre>\n\n\n\n<p>\u30e2\u30c0\u30f3C++\u306b\u304a\u3051\u308bconst\u306e\u6d3b\u7528\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e9\u30e0\u30c0\u5f0f\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ad\u30e3\u30d7\u30c1\u30e3\u30ea\u30b9\u30c8\u3067\u306econst\u53c2\u7167\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>const\u30e1\u30f3\u30d0\u95a2\u6570\u3068\u3057\u3066\u306e\u30e9\u30e0\u30c0\u5f0f\u306e\u5b9a\u7fa9<\/li>\n\n\n\n<li>mutable\u3068\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u65b0\u3057\u3044\u30eb\u30fc\u30d7\u69cb\u6587\u3067\u306e\u6d3b\u7528<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>range-based for\u3067\u306econst\u53c2\u7167<\/li>\n\n\n\n<li>\u69cb\u9020\u5316\u675f\u7e1b\u3067\u306econst<\/li>\n\n\n\n<li>ranges\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>const shared_ptr\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>const unique_ptr\u306e\u79fb\u52d5\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30bb\u30d7\u30c8\u3068\u306e\u7d71\u5408<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>const\u30e1\u30f3\u30d0\u95a2\u6570\u306e\u8981\u6c42<\/li>\n\n\n\n<li>const\u53c2\u7167\u3067\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5236\u7d04<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6a5f\u80fd\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u3067\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-18\">\u5b9f\u8df5\u7684\u306aconst\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3\u96c6<\/h2>\n\n\n\n<p>\u5b9f\u969b\u306e\u958b\u767a\u73fe\u5834\u3067\u306econst\u6d3b\u7528\u306b\u3064\u3044\u3066\u3001\u30d0\u30b0\u9632\u6b62\u30d1\u30bf\u30fc\u30f3\u3068\u5927\u898f\u6a21\u958b\u767a\u3067\u306e\u898f\u7d04\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u3088\u304f\u3042\u308b\u30d0\u30b0\u3092\u9632\u3050\u305f\u3081\u306econst\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e0d\u5909\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d1\u30bf\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u3092\u5909\u66f4\u4e0d\u53ef\u80fd\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u4e26\u884c\u51e6\u7406\u306e\u5b89\u5168\u6027\u3092\u78ba\u4fdd\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class Configuration {\n    const std::string appName;\n    const std::unordered_map&lt;std::string, std::string&gt; settings;\n\npublic:\n    Configuration(std::string name, \n                 std::unordered_map&lt;std::string, std::string&gt; config)\n        : appName(std::move(name))\n        , settings(std::move(config)) {}\n\n    \/\/ \u3059\u3079\u3066\u306e\u30a2\u30af\u30bb\u30b5\u306fconst\n    std::string getAppName() const { return appName; }\n\n    std::string getSetting(const std::string&amp; key) const {\n        auto it = settings.find(key);\n        return it != settings.end() ? it-&gt;second : \"\";\n    }\n\n    \/\/ \u5909\u66f4\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u65b0\u3057\u3044\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8fd4\u3059\n    Configuration withSetting(const std::string&amp; key, \n                            const std::string&amp; value) const {\n        auto newSettings = settings;\n        newSettings[key] = value;\n        return Configuration(appName, std::move(newSettings));\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>Const Correct Interface\u30d1\u30bf\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u8a2d\u8a08\u6642\u304b\u3089const\u3092\u8003\u616e\u306b\u5165\u308c\u308b\u3053\u3068\u3067\u3001\u8aa4\u7528\u3092\u9632\u304e\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DataService {\npublic:\n    \/\/ \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9a\u7fa9\n    virtual const std::vector&lt;int&gt;&amp; getData() const = 0;\n    virtual void updateData(const std::vector&lt;int&gt;&amp; newData) = 0;\n    virtual ~DataService() = default;\n};\n\nclass FileDataService : public DataService {\n    std::vector&lt;int&gt; data;\npublic:\n    \/\/ const correct\u306a\u5b9f\u88c5\n    const std::vector&lt;int&gt;&amp; getData() const override {\n        return data;\n    }\n\n    void updateData(const std::vector&lt;int&gt;&amp; newData) override {\n        data = newData;\n    }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u76e3\u8996\u53ef\u80fd\u306a\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u30d1\u30bf\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u72b6\u614b\u5909\u66f4\u3092\u76e3\u8996\u3057\u306a\u304c\u3089\u3001\u30c7\u30fc\u30bf\u306e\u4e0d\u5909\u6027\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ObservableData {\n    const std::vector&lt;int&gt; data;\n    mutable std::vector&lt;std::function&lt;void(const std::vector&lt;int&gt;&amp;)&gt;&gt; observers;\n    mutable std::mutex observerMutex;\n\npublic:\n    explicit ObservableData(std::vector&lt;int&gt; initial)\n        : data(std::move(initial)) {}\n\n    \/\/ \u30c7\u30fc\u30bf\u306e\u76e3\u8996\u3092\u8ffd\u52a0\uff08const\u30e1\u30bd\u30c3\u30c9\u5185\u3067observers\u3092\u5909\u66f4\uff09\n    void addObserver(std::function&lt;void(const std::vector&lt;int&gt;&amp;)&gt; observer) const {\n        std::lock_guard&lt;std::mutex&gt; lock(observerMutex);\n        observers.push_back(std::move(observer));\n        \/\/ \u65b0\u3057\u3044\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u306b\u73fe\u5728\u306e\u72b6\u614b\u3092\u901a\u77e5\n        observer(data);\n    }\n\n    \/\/ \u65b0\u3057\u3044\u30c7\u30fc\u30bf\u3067\u65b0\u3057\u3044\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\n    ObservableData withNewData(std::vector&lt;int&gt; newData) const {\n        std::lock_guard&lt;std::mutex&gt; lock(observerMutex);\n        for (const auto&amp; observer : observers) {\n            observer(newData);\n        }\n        return ObservableData(std::move(newData));\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">\u5927\u898f\u6a21\u958b\u767a\u3067\u306econst\u898f\u7d04\u306e\u4f5c\u308a\u65b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c1\u30fc\u30e0\u3067\u306e\u57fa\u672c\u898f\u7d04<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u898f\u7d041: \u30e1\u30f3\u30d0\u5909\u6570\u306f\u53ef\u80fd\u306a\u9650\u308aconst\u3067\u5ba3\u8a00\nclass UserProfile {\n    const std::string id;          \/\/ \u5909\u66f4\u4e0d\u53ef\n    const std::string username;     \/\/ \u5909\u66f4\u4e0d\u53ef\n    mutable int accessCount = 0;    \/\/ \u7d71\u8a08\u60c5\u5831\u306f\u5909\u66f4\u53ef\u80fd\n\npublic:\n    UserProfile(std::string userId, std::string name)\n        : id(std::move(userId))\n        , username(std::move(name)) {}\n\n    \/\/ \u898f\u7d042: \u5024\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u306f\u5fc5\u305aconst\n    std::string getId() const { return id; }\n    std::string getUsername() const { return username; }\n\n    \/\/ \u898f\u7d043: \u5185\u90e8\u72b6\u614b\u3092\u5909\u66f4\u3057\u306a\u3044\u64cd\u4f5c\u306fconst\u30e1\u30bd\u30c3\u30c9\u306b\n    void recordAccess() const {\n        ++accessCount;  \/\/ mutable\u306a\u306e\u3067\u8a31\u53ef\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ReviewableCode {\npublic:\n    \/\/ \u2713 \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u5fc5\u305aconst\u53c2\u7167\u3067\u53d7\u3051\u53d6\u308b\n    void processLargeObject(const BigObject&amp; obj);\n\n    \/\/ \u2713 STL\u30b3\u30f3\u30c6\u30ca\u306e\u53cd\u5fa9\u51e6\u7406\u306fconst\u53c2\u7167\u3092\u4f7f\u7528\n    void processVector(const std::vector&lt;int&gt;&amp; vec) const {\n        for (const auto&amp; item : vec) {\n            \/\/ \u51e6\u7406\n        }\n    }\n\n    \/\/ \u2713 \u30e1\u30f3\u30d0\u95a2\u6570\u306f\u53ef\u80fd\u306a\u9650\u308aconst\u3067\u5ba3\u8a00\n    bool validate() const;\n\n    \/\/ \u2713 \u30dd\u30a4\u30f3\u30bf\u3092\u8fd4\u3059\u5834\u5408\u306fconst correctness\u3092\u8003\u616e\n    const Resource* getResource() const;\n    Resource* getResource();\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u5927\u898f\u6a21\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306econst\u898f\u7d04\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u5168\u4f53\u3067\u4f7f\u7528\u3059\u308b\u57fa\u5e95\u30af\u30e9\u30b9\nclass EntityBase {\nprotected:\n    const std::string entityId;\n    mutable std::mutex accessMutex;\n\npublic:\n    explicit EntityBase(std::string id) : entityId(std::move(id)) {}\n\n    \/\/ \u5171\u901a\u306econst\u898f\u7d04\u3092\u9069\u7528\n    virtual const std::string&amp; getId() const final {\n        return entityId;\n    }\n\n    \/\/ const\u64cd\u4f5c\u306e\u305f\u3081\u306e\u4eee\u60f3\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\n    virtual bool validate() const = 0;\n};\n\n\/\/ \u5177\u8c61\u30af\u30e9\u30b9\u3067\u306e\u5b9f\u88c5\u4f8b\nclass UserEntity : public EntityBase {\n    const std::string email;\n    mutable std::vector&lt;LogEntry&gt; accessLog;\n\npublic:\n    UserEntity(std::string id, std::string userEmail)\n        : EntityBase(std::move(id))\n        , email(std::move(userEmail)) {}\n\n    bool validate() const override {\n        std::lock_guard&lt;std::mutex&gt; lock(accessMutex);\n        accessLog.push_back(LogEntry{\"validate\", std::time(nullptr)});\n        return !email.empty();\n    }\n\n    \/\/ \u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u306a\u64cd\u4f5c\u306e\u4f8b\n    UserEntity withUpdatedEmail(std::string newEmail) const {\n        return UserEntity(entityId, std::move(newEmail));\n    }\n};<\/pre>\n\n\n\n<p>\u5b9f\u8df5\u7684\u306aconst\u6d3b\u7528\u306e\u305f\u3081\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u306e\u4e0d\u5909\u6027\u3092\u512a\u5148<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5909\u66f4\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u65b0\u3057\u3044\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8fd4\u3059<\/li>\n\n\n\n<li>\u72b6\u614b\u5909\u66f4\u304c\u5fc5\u8981\u306a\u5834\u5408\u306fmutable\u3092\u9069\u5207\u306b\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u8a2d\u8a08\u306e\u539f\u5247<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8aad\u307f\u53d6\u308a\u64cd\u4f5c\u306f\u5fc5\u305aconst<\/li>\n\n\n\n<li>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u5e38\u306bconst\u53c2\u7167\u3067\u6e21\u3059<\/li>\n\n\n\n<li>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u53cd\u5fa9\u51e6\u7406\u306fconst\u53c2\u7167\u3092\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u898f\u7d04<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u306econst correctness\u78ba\u8a8d<\/li>\n\n\n\n<li>\u5171\u901a\u306e\u57fa\u5e95\u30af\u30e9\u30b9\u3067const\u898f\u7d04\u3092\u5f37\u5236<\/li>\n\n\n\n<li>\u5909\u66f4\u64cd\u4f5c\u3068\u53c2\u7167\u64cd\u4f5c\u3092\u660e\u78ba\u306b\u5206\u96e2<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3068\u898f\u7d04\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u4fdd\u5b88\u6027\u304c\u9ad8\u304f\u3001\u30d0\u30b0\u306e\u5c11\u306a\u3044\u5927\u898f\u6a21\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":{"0":"post-1731","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-cpp","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1731","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1731"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1731\/revisions"}],"predecessor-version":[{"id":1732,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1731\/revisions\/1732"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}