{"id":1810,"date":"2025-03-24T08:49:52","date_gmt":"2025-03-23T23:49:52","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1810"},"modified":"2025-03-24T08:49:52","modified_gmt":"2025-03-23T23:49:52","slug":"c%e3%81%ae%e5%8f%82%e7%85%a7%e6%b8%a1%e3%81%97%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e5%8a%b9%e7%8e%87%e7%9a%84%e3%81%aa%e3%82%b3%e3%83%bc%e3%83%87%e3%82%a3%e3%83%b3%e3%82%b0","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1810","title":{"rendered":"C++\u306e\u53c2\u7167\u6e21\u3057\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u305f\u3081\u306e7\u3064\u306e\u4f7f\u3044\u65b9"},"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\">\u53c2\u7167\u6e21\u3057\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u53c2\u7167\u6e21\u3057\u3068\u306f\u4f55\u304b\uff1a\u30a2\u30c9\u30ec\u30b9\u6e21\u3057\u306e\u65b0\u3057\u3044\u5f62<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">\u306a\u305cC++\u306b\u53c2\u7167\u304c\u5c0e\u5165\u3055\u308c\u305f\u306e\u304b\uff1a\u6b74\u53f2\u7684\u306a\u80cc\u666f<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">\u5024\u6e21\u3057\u3068\u53c2\u7167\u6e21\u3057\u306e\u9055\u3044<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-5\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u3092\u691c\u8a3c\u3059\u308b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-6\">\u53c2\u7167\u6e21\u3057\u306e\u6b63\u3057\u3044\u4f7f\u3044\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-7\">\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u52b9\u7387\u7684\u306b\u6e21\u3059\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-8\">const\u3092\u4f7f\u3063\u305f\u5b89\u5168\u306a\u53c2\u7167\u6e21\u3057\u306e\u5b9f\u73fe<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-9\">\u95a2\u6570\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5909\u66f4\u3059\u308b\u969b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-10\">\u53c2\u7167\u6e21\u3057\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u30b7\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-11\">STL\u30b3\u30f3\u30c6\u30ca\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-12\">\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u95a2\u6570\u3067\u306e\u4f7f\u3044\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">\u30e9\u30e0\u30c0\u5f0f\u3067\u306e\u53c2\u7167\u30ad\u30e3\u30d7\u30c1\u30e3\u306e\u6d3b\u7528<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-14\">\u53c2\u7167\u6e21\u3057\u3067\u3088\u304f\u3042\u308b\u30d0\u30b0\u3068\u5bfe\u7b56<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-15\">\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u53c2\u7167\u3092\u9632\u3050\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-16\">\u4e26\u884c\u51e6\u7406\u3067\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-17\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306e\u30b1\u30fc\u30b9\u30b9\u30bf\u30c7\u30a3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-18\">\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306e\u6700\u9069\u5316\u4e8b\u4f8b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u306b\u3088\u308b\u52b9\u679c\u6e2c\u5b9a<\/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\">\u53c2\u7167\u6e21\u3057\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u53c2\u7167\u6e21\u3057\u3068\u306f\u4f55\u304b\uff1a\u30a2\u30c9\u30ec\u30b9\u6e21\u3057\u306e\u65b0\u3057\u3044\u5f62<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u53c2\u7167\u6e21\u3057\u306f\u3001C++\u304cC\u8a00\u8a9e\u304b\u3089\u9032\u5316\u3059\u308b\u904e\u7a0b\u3067\u5c0e\u5165\u3055\u308c\u305f\u91cd\u8981\u306a\u6a5f\u80fd\u306e\u4e00\u3064\u3067\u3059\u3002\u3053\u308c\u306f\u5909\u6570\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\uff08\u5225\u540d\uff09\u3092\u4f5c\u6210\u3059\u308b\u6a5f\u80fd\u3067\u3001\u30dd\u30a4\u30f3\u30bf\u3088\u308a\u3082\u5b89\u5168\u3067\u76f4\u611f\u7684\u306a\u65b9\u6cd5\u3067\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u3092\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/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=\"\">void modifyValue(int&amp; value) {  \/\/ \u53c2\u7167\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5ba3\u8a00\n    value = 100;  \/\/ \u76f4\u63a5\u5024\u3092\u5909\u66f4\u3067\u304d\u308b\n}\n\nint main() {\n    int number = 42;\n    modifyValue(number);  \/\/ number\u306f100\u306b\u5909\u66f4\u3055\u308c\u308b\n    return 0;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53c2\u7167\u306e\u4e3b\u306a\u7279\u5fb4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5ba3\u8a00\u6642\u306b\u5fc5\u305a\u521d\u671f\u5316\u304c\u5fc5\u8981<\/li>\n\n\n\n<li>NULL\u53c2\u7167\u306f\u5b58\u5728\u3057\u306a\u3044<\/li>\n\n\n\n<li>\u4e00\u5ea6\u521d\u671f\u5316\u3059\u308b\u3068\u5225\u306e\u5909\u6570\u3092\u53c2\u7167\u3067\u304d\u306a\u3044<\/li>\n\n\n\n<li>\u30dd\u30a4\u30f3\u30bf\u3068\u9055\u3044\u3001\u53c2\u7167\u6f14\u7b97\u5b50\uff08*\uff09\u306b\u3088\u308b\u9593\u63a5\u53c2\u7167\u304c\u4e0d\u8981<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u306a\u305cC++\u306b\u53c2\u7167\u304c\u5c0e\u5165\u3055\u308c\u305f\u306e\u304b\uff1a\u6b74\u53f2\u7684\u306a\u80cc\u666f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C++\u306b\u53c2\u7167\u304c\u5c0e\u5165\u3055\u308c\u305f\u80cc\u666f\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u91cd\u8981\u306a\u7406\u7531\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5b89\u5168\u6027\u306e\u5411\u4e0a<\/strong><br>C\u8a00\u8a9e\u306e\u30dd\u30a4\u30f3\u30bf\u306f\u5f37\u529b\u3067\u3059\u304c\u3001NULL\u30dd\u30a4\u30f3\u30bf\u3084\u7121\u52b9\u306a\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306b\u3088\u308b\u30af\u30e9\u30c3\u30b7\u30e5\u306e\u5371\u967a\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u53c2\u7167\u306f\u3053\u308c\u3089\u306e\u554f\u984c\u3092\u8efd\u6e1b\u3057\u307e\u3059\u3002<\/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=\"\">\/\/ \u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u7528\u3057\u305f\u5371\u967a\u306a\u4f8b\nvoid riskyPointer(int* ptr) {\n    if (ptr == nullptr) {  \/\/ NULL\u30c1\u30a7\u30c3\u30af\u304c\u5fc5\u8981\n        return;\n    }\n    *ptr = 100;  \/\/ \u9593\u63a5\u53c2\u7167\u304c\u5fc5\u8981\n}\n\n\/\/ \u53c2\u7167\u3092\u4f7f\u7528\u3057\u305f\u5b89\u5168\u306a\u4f8b\nvoid safeReference(int&amp; ref) {  \/\/ NULL\u30c1\u30a7\u30c3\u30af\u4e0d\u8981\n    ref = 100;  \/\/ \u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u6f14\u7b97\u5b50\u306e\u5b9f\u88c5<\/strong><br>\u6f14\u7b97\u5b50\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3092\u76f4\u611f\u7684\u306b\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306b\u3001\u53c2\u7167\u306f\u4e0d\u53ef\u6b20\u306a\u6a5f\u80fd\u3068\u306a\u308a\u307e\u3057\u305f\uff1a<\/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 Complex {\npublic:\n    Complex&amp; operator+=(const Complex&amp; other) {\n        real += other.real;\n        imag += other.imag;\n        return *this;  \/\/ \u81ea\u8eab\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059\n    }\nprivate:\n    double real;\n    double imag;\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u52b9\u7387\u7684\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53d7\u3051\u6e21\u3057<\/strong><br>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30b3\u30d4\u30fc\u305b\u305a\u306b\u95a2\u6570\u306b\u6e21\u305b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\uff1a<\/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=\"\">\/\/ \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u52b9\u7387\u7684\u306b\u6271\u3046\u4f8b\nvoid processLargeObject(const std::vector&lt;int&gt;&amp; largeVector) {\n    \/\/ \u30b3\u30d4\u30fc\u3092\u4f5c\u3089\u305a\u306b\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\n    for (const auto&amp; element : largeVector) {\n        \/\/ \u51e6\u7406\n    }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u3088\u3046\u306b\u3001\u53c2\u7167\u306e\u5c0e\u5165\u306b\u3088\u308a\u3001C++\u306f\u4ee5\u4e0b\u306e\u5229\u70b9\u3092\u7372\u5f97\u3057\u307e\u3057\u305f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u3088\u308a\u5b89\u5168\u306a\u30e1\u30e2\u30ea\u64cd\u4f5c<\/li>\n\n\n\n<li>\u76f4\u611f\u7684\u306a\u30b3\u30fc\u30c9\u8a18\u8ff0<\/li>\n\n\n\n<li>\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u4f7f\u7528<\/li>\n\n\n\n<li>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u3088\u308a\u81ea\u7136\u306a\u30b5\u30dd\u30fc\u30c8<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u521d\u5b66\u8005\u306e\u65b9\u306f\u3001\u7279\u306b\u4ee5\u4e0b\u306e\u70b9\u306b\u6ce8\u610f\u3057\u3066\u53c2\u7167\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u95a2\u6570\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u306f\u3001\u5909\u66f4\u304c\u5fc5\u8981\u306a\u3044\u5834\u5408\u306f<code>const<\/code>\u53c2\u7167\u3092\u4f7f\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5834\u5408\u306f\u3001\u30b3\u30d4\u30fc\u3092\u907f\u3051\u308b\u305f\u3081\u53c2\u7167\u3092\u4f7f\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u53c2\u7167\u3092\u8fd4\u3059\u95a2\u6570\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3055\u306a\u3044\u3088\u3046\u6ce8\u610f\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u53c2\u7167\u306f\u73fe\u4ee3\u306eC++\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u4e0d\u53ef\u6b20\u306a\u6a5f\u80fd\u3067\u3042\u308a\u3001\u9069\u5207\u306b\u4f7f\u7528\u3059\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-3\">\u5024\u6e21\u3057\u3068\u53c2\u7167\u6e21\u3057\u306e\u9055\u3044<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5024\u6e21\u3057\u3068\u53c2\u7167\u6e21\u3057\u306e\u6700\u3082\u91cd\u8981\u306a\u9055\u3044\u306f\u3001\u30e1\u30e2\u30ea\u306e\u4f7f\u7528\u65b9\u6cd5\u306b\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u4f8b\u3067\u5177\u4f53\u7684\u306b\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff1a<\/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=\"\">#include &lt;vector&gt;\n#include &lt;string&gt;\n\n\/\/ \u5024\u6e21\u3057\u306e\u4f8b\nvoid byValue(std::vector&lt;int&gt; vec) {\n    vec.push_back(100);  \/\/ \u5143\u306e\u914d\u5217\u306b\u306f\u5f71\u97ff\u3057\u306a\u3044\n}\n\n\/\/ \u53c2\u7167\u6e21\u3057\u306e\u4f8b\nvoid byReference(std::vector&lt;int&gt;&amp; vec) {\n    vec.push_back(100);  \/\/ \u5143\u306e\u914d\u5217\u304c\u5909\u66f4\u3055\u308c\u308b\n}\n\nint main() {\n    std::vector&lt;int&gt; numbers{1, 2, 3, 4, 5};\n\n    \/\/ \u5024\u6e21\u3057\uff1avector\u306e\u30b3\u30d4\u30fc\u304c\u4f5c\u6210\u3055\u308c\u308b\n    byValue(numbers);      \/\/ numbers\u306f\u5909\u66f4\u3055\u308c\u306a\u3044\n\n    \/\/ \u53c2\u7167\u6e21\u3057\uff1a\u30b3\u30d4\u30fc\u306f\u4f5c\u6210\u3055\u308c\u306a\u3044\n    byReference(numbers);  \/\/ numbers\u304c\u5909\u66f4\u3055\u308c\u308b\n\n    return 0;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6bd4\u8f03\uff1a<\/p>\n\n\n<div id=\"id-18f68234-c6b8-4fb6-bea9-2881203c32b9\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6e21\u3057\u65b9<\/th><th>\u30e1\u30e2\u30ea\u6d88\u8cbb<\/th><th>\u7279\u5fb4<\/th><\/tr><\/thead><tbody><tr><td>\u5024\u6e21\u3057<\/td><td>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30b5\u30a4\u30ba\u5206\u306e\u8ffd\u52a0\u30e1\u30e2\u30ea\u304c\u5fc5\u8981<\/td><td>\u2013 \u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5b8c\u5168\u306a\u30b3\u30d4\u30fc\u3092\u4f5c\u6210<br>\u2013 \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306f\u975e\u52b9\u7387<\/td><\/tr><tr><td>\u53c2\u7167\u6e21\u3057<\/td><td>\u30dd\u30a4\u30f3\u30bf\u30b5\u30a4\u30ba\uff08\u901a\u5e388\u30d0\u30a4\u30c8\uff09\u306e\u307f<\/td><td>\u2013 \u8ffd\u52a0\u306e\u30e1\u30e2\u30ea\u78ba\u4fdd\u304c\u6700\u5c0f\u9650<br>\u2013 \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3082\u52b9\u7387\u7684<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u3092\u691c\u8a3c\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5024\u6e21\u3057\u3068\u53c2\u7167\u6e21\u3057\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u9055\u3044\u3092\u3001\u5b9f\u969b\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/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=\"\">#include &lt;chrono&gt;\n#include &lt;iostream&gt;\n#include &lt;vector&gt;\n\n\/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6e2c\u5b9a\u7528\u306e\u95a2\u6570\ntemplate&lt;typename Func&gt;\nlong long measureTime(Func f) {\n    auto start = std::chrono::high_resolution_clock::now();\n    f();\n    auto end = std::chrono::high_resolution_clock::now();\n    return std::chrono::duration_cast&lt;std::chrono::microseconds&gt;(end - start).count();\n}\n\n\/\/ \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u51e6\u7406\u3059\u308b\u95a2\u6570\uff08\u5024\u6e21\u3057\uff09\nvoid processLargeObjectByValue(std::vector&lt;double&gt; vec) {\n    for (auto&amp; v : vec) {\n        v *= 2.0;\n    }\n}\n\n\/\/ \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u51e6\u7406\u3059\u308b\u95a2\u6570\uff08\u53c2\u7167\u6e21\u3057\uff09\nvoid processLargeObjectByReference(std::vector&lt;double&gt;&amp; vec) {\n    for (auto&amp; v : vec) {\n        v *= 2.0;\n    }\n}\n\n\/\/ \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c\nint main() {\n    const size_t size = 1000000;  \/\/ 100\u4e07\u8981\u7d20\n    std::vector&lt;double&gt; data(size, 1.0);\n\n    \/\/ \u5024\u6e21\u3057\u306e\u5b9f\u884c\u6642\u9593\u6e2c\u5b9a\n    auto timeByValue = measureTime([&amp;]() {\n        processLargeObjectByValue(data);\n    });\n\n    \/\/ \u53c2\u7167\u6e21\u3057\u306e\u5b9f\u884c\u6642\u9593\u6e2c\u5b9a\n    auto timeByReference = measureTime([&amp;]() {\n        processLargeObjectByReference(data);\n    });\n\n    std::cout &lt;&lt; \"\u5024\u6e21\u3057\u5b9f\u884c\u6642\u9593: \" &lt;&lt; timeByValue &lt;&lt; \"\u03bcs\\n\";\n    std::cout &lt;&lt; \"\u53c2\u7167\u6e21\u3057\u5b9f\u884c\u6642\u9593: \" &lt;&lt; timeByReference &lt;&lt; \"\u03bcs\\n\";\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5178\u578b\u7684\u306a\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c\uff1a<\/p>\n\n\n<div id=\"id-46288627-a9ad-47db-a6d0-1bacfa33b341\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba<\/th><th>\u5024\u6e21\u3057<\/th><th>\u53c2\u7167\u6e21\u3057<\/th><th>\u5dee\u5206<\/th><\/tr><\/thead><tbody><tr><td>1,000\u8981\u7d20<\/td><td>15\u03bcs<\/td><td>5\u03bcs<\/td><td>3\u500d<\/td><\/tr><tr><td>10,000\u8981\u7d20<\/td><td>150\u03bcs<\/td><td>45\u03bcs<\/td><td>3.3\u500d<\/td><\/tr><tr><td>100,000\u8981\u7d20<\/td><td>1,500\u03bcs<\/td><td>450\u03bcs<\/td><td>3.3\u500d<\/td><\/tr><tr><td>1,000,000\u8981\u7d20<\/td><td>15,000\u03bcs<\/td><td>4,500\u03bcs<\/td><td>3.3\u500d<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u8981\u56e0\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b5\u30a4\u30ba<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5c0f\u3055\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08int, double\u7b49\uff09\uff1a\u5024\u6e21\u3057\u3067\u3082\u5927\u304d\u306a\u5f71\u97ff\u306a\u3057<\/li>\n\n\n\n<li>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08vector, string\u7b49\uff09\uff1a\u53c2\u7167\u6e21\u3057\u304c\u5727\u5012\u7684\u306b\u6709\u5229<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u95a2\u6570\u547c\u3073\u51fa\u3057\u306e\u983b\u5ea6<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u983b\u7e41\u306a\u547c\u3073\u51fa\u3057\uff1a\u53c2\u7167\u6e21\u3057\u306e\u65b9\u304c\u6709\u5229<\/li>\n\n\n\n<li>\u7a00\u306a\u547c\u3073\u51fa\u3057\uff1a\u9055\u3044\u306f\u6bd4\u8f03\u7684\u5c0f\u3055\u3044<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6700\u9069\u5316\u306e\u5f71\u97ff<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\u306b\u3088\u308a\u3001\u5c0f\u3055\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u6e21\u3057\u306f\u53c2\u7167\u6e21\u3057\u3068\u540c\u7b49\u306b\u306a\u308b\u3053\u3068\u3082\u3042\u308b<\/li>\n\n\n\n<li>Return Value Optimization (RVO)\u306b\u3088\u308a\u3001\u623b\u308a\u5024\u306e\u6700\u9069\u5316\u304c\u884c\u308f\u308c\u308b<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u9078\u629e\u306e\u6307\u91dd\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u57fa\u672c\u578b\uff08int, double\u7b49\uff09\u306f\u5024\u6e21\u3057\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u53c2\u7167\u6e21\u3057\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5909\u66f4\u3057\u306a\u3044\u5834\u5408\u306f const \u53c2\u7167\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u90e8\u5206\u3067\u306f\u5fc5\u305a\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u3092\u5b9f\u65bd<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u3088\u3046\u306b\u3001\u5024\u6e21\u3057\u3068\u53c2\u7167\u6e21\u3057\u306f\u4f7f\u7528\u3059\u308b\u30b1\u30fc\u30b9\u306b\u3088\u3063\u3066\u5927\u304d\u304f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051\u304c\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u52b9\u7387\u3092\u5de6\u53f3\u3059\u308b\u91cd\u8981\u306a\u8981\u7d20\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-6\">\u53c2\u7167\u6e21\u3057\u306e\u6b63\u3057\u3044\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u52b9\u7387\u7684\u306b\u6e21\u3059\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6271\u3046\u969b\u306e\u53c2\u7167\u6e21\u3057\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff1a<\/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=\"\">#include &lt;string&gt;\n#include &lt;vector&gt;\n\nclass LargeObject {\n    std::vector&lt;double&gt; data;\n    std::string description;\npublic:\n    LargeObject(size_t size) : data(size) {}\n};\n\n\/\/ \u975e\u52b9\u7387\u306a\u5b9f\u88c5\uff08\u5024\u6e21\u3057\uff09\nvoid processObjectBad(LargeObject obj) {\n    \/\/ obj\u306f\u547c\u3073\u51fa\u3057\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30d4\u30fc\n}\n\n\/\/ \u52b9\u7387\u7684\u306a\u5b9f\u88c5\uff08const\u53c2\u7167\u6e21\u3057\uff09\nvoid processObjectGood(const LargeObject&amp; obj) {\n    \/\/ obj\u306f\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\n}\n\n\/\/ \u30b3\u30f3\u30c6\u30ca\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406\nvoid processContainer(const std::vector&lt;LargeObject&gt;&amp; objects) {\n    for (const auto&amp; obj : objects) {  \/\/ \u7bc4\u56f2for\u30eb\u30fc\u30d7\u3067\u3082\u53c2\u7167\u3092\u4f7f\u7528\n        \/\/ obj\u306e\u51e6\u7406\n    }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u52b9\u7387\u7684\u306a\u53c2\u7167\u6e21\u3057\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>16\u30d0\u30a4\u30c8\u4ee5\u4e0a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u53c2\u7167\u6e21\u3057\u3092\u691c\u8a0e<\/li>\n\n\n\n<li>STL\u30b3\u30f3\u30c6\u30ca\u306f\u5e38\u306b\u53c2\u7167\u6e21\u3057\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u30e6\u30fc\u30b6\u30fc\u5b9a\u7fa9\u30af\u30e9\u30b9\u306f\u57fa\u672c\u7684\u306b\u53c2\u7167\u6e21\u3057\u3092\u4f7f\u7528<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">const\u3092\u4f7f\u3063\u305f\u5b89\u5168\u306a\u53c2\u7167\u6e21\u3057\u306e\u5b9f\u73fe<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">const\u53c2\u7167\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e0d\u5909\u6027\u3092\u4fdd\u8a3c\u3059\u308b\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\uff1a<\/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=\"\">#include &lt;string&gt;\n\nclass Customer {\n    std::string name;\n    int id;\npublic:\n    \/\/ getter\u306fconst\u30e1\u30f3\u30d0\u95a2\u6570\u3068\u3057\u3066\u5b9f\u88c5\n    const std::string&amp; getName() const {\n        return name;  \/\/ \u6587\u5b57\u5217\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059\n    }\n\n    \/\/ setter\u306f\u53c2\u7167\u3067\u53d7\u3051\u53d6\u308a\n    void setName(const std::string&amp; newName) {\n        name = newName;\n    }\n};\n\n\/\/ \u5b89\u5168\u306a\u5b9f\u88c5\u4f8b\nvoid printCustomerInfo(const Customer&amp; customer) {\n    \/\/ customer\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5909\u66f4\u3067\u304d\u306a\u3044\n    std::cout &lt;&lt; customer.getName() &lt;&lt; std::endl;\n}\n\n\/\/ \u30b3\u30f3\u30c6\u30ca\u8981\u7d20\u3078\u306e\u5b89\u5168\u306a\u30a2\u30af\u30bb\u30b9\nvoid processCustomers(const std::vector&lt;Customer&gt;&amp; customers) {\n    for (const auto&amp; customer : customers) {\n        printCustomerInfo(customer);\n    }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">const\u53c2\u7167\u3092\u4f7f\u7528\u3059\u3079\u304d\u30b1\u30fc\u30b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8aad\u307f\u53d6\u308a\u5c02\u7528\u306e\u64cd\u4f5c<\/li>\n\n\n\n<li>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167<\/li>\n\n\n\n<li>\u30b3\u30f3\u30c6\u30ca\u306e\u53cd\u5fa9\u51e6\u7406<\/li>\n\n\n\n<li>getter\u95a2\u6570\u306e\u623b\u308a\u5024<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u95a2\u6570\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5909\u66f4\u3059\u308b\u969b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306e\u9069\u5207\u306a\u5b9f\u88c5\u65b9\u6cd5\uff1a<\/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 OrderProcessor {\npublic:\n    \/\/ \u5909\u66f4\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u975econst\u306a\u53c2\u7167\u3092\u4f7f\u7528\n    bool processOrder(Order&amp; order) {\n        if (!validateOrder(order)) {\n            return false;\n        }\n        order.setStatus(OrderStatus::Processing);\n        return true;\n    }\n\nprivate:\n    \/\/ \u5909\u66f4\u4e0d\u8981\u306a\u691c\u8a3c\u306f const \u53c2\u7167\u3092\u4f7f\u7528\n    bool validateOrder(const Order&amp; order) const {\n        return order.getTotal() &gt; 0;\n    }\n};\n\n\/\/ \u8907\u6570\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5909\u66f4\u3059\u308b\u4f8b\nvoid updatePrices(std::vector&lt;Product&gt;&amp; products, double factor) {\n    for (auto&amp; product : products) {\n        product.setPrice(product.getPrice() * factor);\n    }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53c2\u7167\u3092\u8fd4\u3059\u95a2\u6570\u306e\u6ce8\u610f\u70b9\uff1a<\/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 Container {\n    std::vector&lt;int&gt; data;\npublic:\n    \/\/ OK: \u30e1\u30f3\u30d0\u5909\u6570\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059\n    int&amp; at(size_t index) {\n        return data[index];\n    }\n\n    \/\/ NG: \u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059\n    int&amp; badReference() {\n        int local = 42;\n        return local;  \/\/ \u5371\u967a\uff01\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u304c\u7d42\u4e86\n    }\n};<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5909\u66f4\u6642\u306e\u53c2\u7167\u4f7f\u7528\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5909\u66f4\u304c\u5fc5\u8981\u306a\u5834\u5408\u306e\u307f\u975econst\u306a\u53c2\u7167\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u53c2\u7167\u3092\u8fd4\u3059\u5834\u5408\u306f\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u306b\u6ce8\u610f<\/li>\n\n\n\n<li>\u8907\u6570\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e00\u62ec\u66f4\u65b0\u306b\u306f\u7bc4\u56f2for\u30eb\u30fc\u30d7\u3068\u53c2\u7167\u3092\u7d44\u307f\u5408\u308f\u305b<\/li>\n\n\n\n<li>\u30e1\u30f3\u30d0\u95a2\u6570\u3067\u306f\u5fc5\u8981\u306b\u5fdc\u3058\u3066const\u3092\u4ed8\u4e0e<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u5b88\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u3067\u5b89\u5168\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306bconst\u53c2\u7167\u306e\u9069\u5207\u306a\u4f7f\u7528\u306f\u3001\u30d0\u30b0\u306e\u9632\u6b62\u3068\u30b3\u30fc\u30c9\u306e\u4fdd\u5b88\u6027\u5411\u4e0a\u306b\u5927\u304d\u304f\u8ca2\u732e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-10\">\u53c2\u7167\u6e21\u3057\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u30b7\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">STL\u30b3\u30f3\u30c6\u30ca\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">STL\u30b3\u30f3\u30c6\u30ca\u3092\u52b9\u7387\u7684\u306b\u6271\u3046\u305f\u3081\u306e\u53c2\u7167\u6e21\u3057\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff1a<\/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=\"\">#include &lt;vector&gt;\n#include &lt;algorithm&gt;\n#include &lt;string&gt;\n#include &lt;map&gt;\n\n\/\/ \u30c7\u30fc\u30bf\u5909\u63db\u306e\u52b9\u7387\u7684\u306a\u5b9f\u88c5\nvoid transformData(const std::vector&lt;std::string&gt;&amp; input,\n                  std::vector&lt;int&gt;&amp; output) {\n    output.reserve(input.size());  \/\/ \u30e1\u30e2\u30ea\u306e\u4e8b\u524d\u78ba\u4fdd\n    for (const auto&amp; str : input) {\n        output.push_back(std::stoi(str));\n    }\n}\n\n\/\/ \u30de\u30c3\u30d7\u306e\u8981\u7d20\u3092\u53c2\u7167\u3067\u53d6\u5f97\nvoid updateUserScores(std::map&lt;std::string, int&gt;&amp; scores) {\n    \/\/ \u53c2\u7167\u3067\u76f4\u63a5\u8981\u7d20\u3092\u66f4\u65b0\n    auto&amp; johnScore = scores[\"John\"];  \/\/ \u65b0\u898f\u8981\u7d20\u306e\u5834\u5408\u306f\u4f5c\u6210\u3055\u308c\u308b\n    johnScore += 100;\n\n    \/\/ find\u4f7f\u7528\u6642\u306e\u53c2\u7167\n    if (auto it = scores.find(\"Alice\"); it != scores.end()) {\n        auto&amp; score = it-&gt;second;  \/\/ \u53c2\u7167\u3067\u53d6\u5f97\n        score *= 2;  \/\/ \u76f4\u63a5\u66f4\u65b0\n    }\n}\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u30b3\u30f3\u30c6\u30ca\u3067\u306e\u53c2\u7167\u4f7f\u7528\ntemplate&lt;typename T&gt;\nclass CircularBuffer {\n    std::vector&lt;T&gt; data;\n    size_t head = 0;\npublic:\n    \/\/ \u5148\u982d\u8981\u7d20\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059\n    T&amp; front() { return data[head]; }\n    const T&amp; front() const { return data[head]; }\n};<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">STL\u3067\u306e\u53c2\u7167\u4f7f\u7528\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a4\u30c6\u30ec\u30fc\u30bf\u3068\u53c2\u7167\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u52b9\u7387\u7684\u306a\u8981\u7d20\u30a2\u30af\u30bb\u30b9<\/li>\n\n\n\n<li>\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u306e\u53c2\u7167\u30ad\u30e3\u30d7\u30c1\u30e3\u306b\u3088\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/li>\n\n\n\n<li>map\/set\u3067\u306e\u8981\u7d20\u53c2\u7167\u306b\u3088\u308b\u76f4\u63a5\u66f4\u65b0<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u95a2\u6570\u3067\u306e\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u53c2\u7167\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\uff1a<\/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 ResourceManager {\n    std::vector&lt;Resource&gt; resources;\npublic:\n    \/\/ \u30c1\u30a7\u30fc\u30f3\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\n    ResourceManager&amp; add(const Resource&amp; res) {\n        resources.push_back(res);\n        return *this;  \/\/ \u81ea\u8eab\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059\n    }\n\n    \/\/ \u8981\u7d20\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059getter\n    Resource&amp; getResource(size_t index) {\n        return resources[index];\n    }\n\n    \/\/ const\u7248\u306egetter\n    const Resource&amp; getResource(size_t index) const {\n        return resources[index];\n    }\n};\n\n\/\/ Builder\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u6d3b\u7528\nclass QueryBuilder {\n    Query query;\npublic:\n    QueryBuilder&amp; where(const std::string&amp; condition) {\n        query.addCondition(condition);\n        return *this;\n    }\n\n    QueryBuilder&amp; orderBy(const std::string&amp; field) {\n        query.setOrderBy(field);\n        return *this;\n    }\n\n    \/\/ \u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u306e\u4f7f\u7528\u4f8b\n    static void example() {\n        QueryBuilder()\n            .where(\"age &gt; 20\")\n            .orderBy(\"name\")\n            .where(\"status = 'active'\");\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30e9\u30e0\u30c0\u5f0f\u3067\u306e\u53c2\u7167\u30ad\u30e3\u30d7\u30c1\u30e3\u306e\u6d3b\u7528<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30e2\u30c0\u30f3C++\u306b\u304a\u3051\u308b\u30e9\u30e0\u30c0\u5f0f\u3068\u53c2\u7167\u306e\u7d44\u307f\u5408\u308f\u305b\uff1a<\/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=\"\">#include &lt;functional&gt;\n#include &lt;algorithm&gt;\n\nclass DataProcessor {\npublic:\n    void processItems(std::vector&lt;Item&gt;&amp; items, int threshold) {\n        \/\/ \u53c2\u7167\u30ad\u30e3\u30d7\u30c1\u30e3\u306e\u4f8b\n        int count = 0;\n        std::for_each(items.begin(), items.end(),\n            [&amp;count, threshold](Item&amp; item) {\n                if (item.getValue() &gt; threshold) {\n                    item.process();\n                    ++count;  \/\/ \u5916\u90e8\u5909\u6570\u3092\u53c2\u7167\u3067\u66f4\u65b0\n                }\n            });\n\n        \/\/ \u8907\u6570\u5909\u6570\u306e\u53c2\u7167\u30ad\u30e3\u30d7\u30c1\u30e3\n        double total = 0.0;\n        int processed = 0;\n        std::for_each(items.begin(), items.end(),\n            [&amp;](Item&amp; item) {  \/\/ \u3059\u3079\u3066\u306e\u5909\u6570\u3092\u53c2\u7167\u3067\u30ad\u30e3\u30d7\u30c1\u30e3\n                total += item.getValue();\n                ++processed;\n            });\n    }\n};\n\n\/\/ \u975e\u540c\u671f\u51e6\u7406\u3067\u306e\u6d3b\u7528\nvoid asyncExample() {\n    std::vector&lt;Data&gt; results;\n    std::mutex mutex;\n\n    auto processor = [&amp;results, &amp;mutex](const Data&amp; data) {\n        auto processed = heavyComputation(data);\n        std::lock_guard&lt;std::mutex&gt; lock(mutex);\n        results.push_back(processed);\n    };\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u30b7\u30fc\u30f3\u3067\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>STL\u30b3\u30f3\u30c6\u30ca\u4f7f\u7528\u6642\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u7121\u52b9\u5316\u306b\u6ce8\u610f<\/li>\n\n\n\n<li>\u8981\u7d20\u306e\u8ffd\u52a0\/\u524a\u9664\u6642\u306f\u53c2\u7167\u306e\u6709\u52b9\u6027\u3092\u78ba\u8a8d<\/li>\n\n\n\n<li>\u4e26\u5217\u51e6\u7406\u6642\u306f\u9069\u5207\u306a\u540c\u671f\u51e6\u7406\u3092\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30f3\u30d0\u95a2\u6570\u3067\u306e\u4f7f\u7528\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u306f\u5fc5\u305a\u53c2\u7167\u3092\u8fd4\u3059<\/li>\n\n\n\n<li>const\u30e1\u30f3\u30d0\u95a2\u6570\u3067\u306f const \u53c2\u7167\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u4eee\u60f3\u95a2\u6570\u3067\u3082\u53c2\u7167\u306e\u4e00\u8cab\u6027\u3092\u4fdd\u6301<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e9\u30e0\u30c0\u5f0f\u3067\u306e\u4f7f\u7528\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ad\u30e3\u30d7\u30c1\u30e3\u3059\u308b\u5909\u6570\u306e\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u306b\u6ce8\u610f<\/li>\n\n\n\n<li>\u4e26\u5217\u51e6\u7406\u6642\u306f\u9069\u5207\u306a\u30b9\u30b3\u30fc\u30d7\u7ba1\u7406<\/li>\n\n\n\n<li>\u30e0\u30fc\u30d6\u6355\u6349\u3068\u306e\u4f75\u7528\u6642\u306f\u6ce8\u610f\u304c\u5fc5\u8981<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044C++\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-14\">\u53c2\u7167\u6e21\u3057\u3067\u3088\u304f\u3042\u308b\u30d0\u30b0\u3068\u5bfe\u7b56<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u53c2\u7167\u3092\u9632\u3050\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u53c2\u7167\uff08\u7121\u52b9\u306a\u53c2\u7167\uff09\u306f\u3001\u6700\u3082\u4e00\u822c\u7684\u3067\u5371\u967a\u306a\u53c2\u7167\u95a2\u9023\u306e\u30d0\u30b0\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u306a\u30b1\u30fc\u30b9\u3068\u5bfe\u7b56\u3092\u793a\u3057\u307e\u3059\uff1a<\/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 ResourceHandler {\nprivate:\n    \/\/ \u5371\u967a\u306a\u5b9f\u88c5\uff1a\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u53c2\u7167\u3092\u8fd4\u3059\u53ef\u80fd\u6027\n    int&amp; getDangerousReference() {\n        int temp = 42;\n        return temp;  \/\/ \u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059 - \u30d0\u30b0\uff01\n    }\n\n    \/\/ \u5b89\u5168\u306a\u5b9f\u88c5\uff1a\u5024\u3092\u8fd4\u3059\n    int getSafeValue() {\n        int temp = 42;\n        return temp;  \/\/ \u5024\u3092\u8fd4\u3059 - OK\n    }\n\n    \/\/ \u5b89\u5168\u306a\u5b9f\u88c5\uff1a\u30e1\u30f3\u30d0\u5909\u6570\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3059\n    int&amp; getSafeMemberReference() {\n        return memberVariable;  \/\/ \u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u5909\u6570\u3078\u306e\u53c2\u7167 - OK\n    }\n\n    int memberVariable;\n};\n\n\/\/ \u3088\u304f\u3042\u308b\u5371\u967a\u306a\u30d1\u30bf\u30fc\u30f3\u3068\u5bfe\u7b56\nclass Container {\npublic:\n    \/\/ \u5371\u967a\u306a\u5b9f\u88c5\n    std::vector&lt;int&gt;&amp; getBadReference() {\n        std::vector&lt;int&gt; temp{1, 2, 3};\n        return temp;  \/\/ \u30b9\u30b3\u30fc\u30d7\u3092\u629c\u3051\u308b\u3068\u7121\u52b9\u306b\u306a\u308b\n    }\n\n    \/\/ \u5b89\u5168\u306a\u5b9f\u88c51\uff1a\u5024\u3092\u8fd4\u3059\n    std::vector&lt;int&gt; getSafeValue() {\n        return data;  \/\/ \u30b3\u30d4\u30fc\u307e\u305f\u306f\u30e0\u30fc\u30d6\u304c\u767a\u751f\n    }\n\n    \/\/ \u5b89\u5168\u306a\u5b9f\u88c52\uff1a\u53c2\u7167\u3092\u8fd4\u3059\u304c\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u3092\u4fdd\u8a3c\n    const std::vector&lt;int&gt;&amp; getSafeReference() const {\n        return data;  \/\/ \u30e1\u30f3\u30d0\u5909\u6570\u3078\u306e\u53c2\u7167\n    }\n\nprivate:\n    std::vector&lt;int&gt; data;\n};<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c0\u30f3\u30b0\u30ea\u30f3\u30b0\u53c2\u7167\u3092\u9632\u3050\u305f\u3081\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3055\u306a\u3044<\/li>\n\n\n\n<li>\u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\u3092\u4fdd\u6301\u3057\u306a\u3044<\/li>\n\n\n\n<li>\u30e1\u30f3\u30d0\u5909\u6570\u3078\u306e\u53c2\u7167\u306f<code>this<\/code>\u306e\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u3092\u8003\u616e<\/li>\n\n\n\n<li>\u30b3\u30f3\u30c6\u30ca\u306e\u8981\u7d20\u3078\u306e\u53c2\u7167\u306f\u518d\u5272\u308a\u5f53\u3066\u6642\u306b\u6ce8\u610f<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u4e26\u884c\u51e6\u7406\u3067\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e26\u884c\u51e6\u7406\u74b0\u5883\u3067\u306e\u53c2\u7167\u4f7f\u7528\u306b\u306f\u7279\u5225\u306a\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\uff1a<\/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=\"\">#include &lt;thread&gt;\n#include &lt;mutex&gt;\n#include &lt;memory&gt;\n\nclass ThreadSafeCounter {\npublic:\n    void increment() {\n        std::lock_guard&lt;std::mutex&gt; lock(mutex);\n        ++count;\n    }\n\n    \/\/ \u5371\u967a\u306a\u5b9f\u88c5\n    int&amp; getUnsafeReference() {\n        return count;  \/\/ \u30ed\u30c3\u30af\u306a\u3057\u3067\u53c2\u7167\u3092\u8fd4\u3059 - \u30d0\u30b0\uff01\n    }\n\n    \/\/ \u5b89\u5168\u306a\u5b9f\u88c5\n    int getValue() const {\n        std::lock_guard&lt;std::mutex&gt; lock(mutex);\n        return count;  \/\/ \u5024\u306e\u30b3\u30d4\u30fc\u3092\u8fd4\u3059\n    }\n\nprivate:\n    mutable std::mutex mutex;\n    int count = 0;\n};\n\n\/\/ \u5171\u6709\u30c7\u30fc\u30bf\u3078\u306e\u5b89\u5168\u306a\u30a2\u30af\u30bb\u30b9\nclass SafeDataHandler {\npublic:\n    void processData(const std::vector&lt;int&gt;&amp; data) {\n        std::lock_guard&lt;std::mutex&gt; lock(mutex);\n        \/\/ \u5b89\u5168\u306a\u51e6\u7406\n        sharedData = data;\n    }\n\n    \/\/ \u53c2\u7167\u3092\u8fd4\u3059\u5834\u5408\u306f\u5171\u6709\u30c7\u30fc\u30bf\u306e\u30b3\u30d4\u30fc\u3092\u8fd4\u3059\n    std::vector&lt;int&gt; getDataCopy() const {\n        std::lock_guard&lt;std::mutex&gt; lock(mutex);\n        return sharedData;\n    }\n\nprivate:\n    std::mutex mutex;\n    std::vector&lt;int&gt; sharedData;\n};<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e26\u884c\u51e6\u7406\u3067\u306e\u53c2\u7167\u4f7f\u7528\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5171\u6709\u30c7\u30fc\u30bf\u3078\u306e\u53c2\u7167\u306f\u5fc5\u305a\u30ed\u30c3\u30af\u3067\u4fdd\u8b77<\/li>\n\n\n\n<li>\u53ef\u80fd\u306a\u9650\u308a\u53c2\u7167\u3067\u306f\u306a\u304f\u5024\u3092\u8fd4\u3059<\/li>\n\n\n\n<li>const\u53c2\u7167\u306e\u4f7f\u7528\u3092\u691c\u8a0e<\/li>\n\n\n\n<li>\u30a2\u30c8\u30df\u30c3\u30af\u64cd\u4f5c\u306e\u6d3b\u7528<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u3088\u304f\u3042\u308b\u30d0\u30b0\u30d1\u30bf\u30fc\u30f3\u3068\u305d\u306e\u5bfe\u7b56\uff1a<\/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=\"\">\/\/ 1. \u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u7121\u52b9\u5316\nvoid commonBug1() {\n    std::vector&lt;int&gt; numbers{1, 2, 3};\n    auto&amp; first = numbers[0];  \/\/ \u5371\u967a\u306a\u53c2\u7167\n    numbers.push_back(4);      \/\/ \u518d\u5272\u308a\u5f53\u3066\u3067\u7121\u52b9\u5316\u3055\u308c\u308b\u53ef\u80fd\u6027\n}\n\n\/\/ \u5bfe\u7b561: \u53c2\u7167\u3092\u77ed\u671f\u9593\u306e\u307f\u4fdd\u6301\nvoid solution1() {\n    std::vector&lt;int&gt; numbers{1, 2, 3};\n    numbers.reserve(10);       \/\/ \u4e8b\u524d\u306b\u5bb9\u91cf\u78ba\u4fdd\n    auto&amp; first = numbers[0];  \/\/ \u3053\u308c\u306a\u3089\u5b89\u5168\n    numbers.push_back(4);\n}\n\n\/\/ 2. \u6761\u4ef6\u5206\u5c90\u3067\u306e\u53c2\u7167\u521d\u671f\u5316\u5fd8\u308c\nvoid commonBug2(bool condition) {\n    int&amp; ref;  \/\/ \u30a8\u30e9\u30fc\uff1a\u53c2\u7167\u306f\u521d\u671f\u5316\u304c\u5fc5\u8981\n    if (condition) {\n        int value = 42;\n        ref = value;  \/\/ \u30d0\u30b0\uff1a\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3078\u306e\u53c2\u7167\n    }\n}\n\n\/\/ \u5bfe\u7b562: \u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u4f7f\u7528\nvoid solution2(bool condition) {\n    std::shared_ptr&lt;int&gt; ptr;\n    if (condition) {\n        ptr = std::make_shared&lt;int&gt;(42);\n    }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d0\u30b0\u9632\u6b62\u306e\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u53c2\u7167\u306e\u30e9\u30a4\u30d5\u30bf\u30a4\u30e0\u7ba1\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53c2\u7167\u306f\u53ef\u80fd\u306a\u9650\u308a\u77ed\u3044\u30b9\u30b3\u30fc\u30d7\u3067\u4f7f\u7528<\/li>\n\n\n\n<li>\u4e0d\u78ba\u5b9f\u306a\u5834\u5408\u306f\u5024\u6e21\u3057\u3092\u9078\u629e<\/li>\n\n\n\n<li>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u6d3b\u7528\u3092\u691c\u8a0e<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30c6\u30ca\u64cd\u4f5c\u3067\u306e\u6ce8\u610f<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30c6\u30ec\u30fc\u30bf\u7121\u52b9\u5316\u306b\u6ce8\u610f<\/li>\n\n\n\n<li>\u8981\u7d20\u8ffd\u52a0\u6642\u306e\u518d\u5272\u308a\u5f53\u3066\u3092\u8003\u616e<\/li>\n\n\n\n<li>\u4e8b\u524d\u306e\u30e1\u30e2\u30ea\u78ba\u4fdd\u3092\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e26\u884c\u51e6\u7406\u3067\u306e\u5bfe\u7b56<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u306b\u3088\u308b\u4fdd\u8b77<\/li>\n\n\n\n<li>\u30a2\u30c8\u30df\u30c3\u30af\u64cd\u4f5c\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n\n\n\n<li>\u5024\u306e\u30b3\u30d4\u30fc\u3092\u7a4d\u6975\u7684\u306b\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04\u306e\u6574\u5099<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53c2\u7167\u3092\u8fd4\u3059\u95a2\u6570\u306e\u547d\u540d\u898f\u5247<\/li>\n\n\n\n<li>const\u53c2\u7167\u306e\u7a4d\u6975\u7684\u306a\u4f7f\u7528<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u306e\u91cd\u70b9\u78ba\u8a8d\u9805\u76ee<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u6ce8\u610f\u70b9\u3068\u5bfe\u7b56\u3092\u610f\u8b58\u3059\u308b\u3053\u3068\u3067\u3001\u53c2\u7167\u306b\u95a2\u9023\u3059\u308b\u591a\u304f\u306e\u30d0\u30b0\u3092\u672a\u7136\u306b\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-17\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306e\u30b1\u30fc\u30b9\u30b9\u30bf\u30c7\u30a3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306e\u6700\u9069\u5316\u4e8b\u4f8b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5927\u898f\u6a21\u753b\u50cf\u51e6\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6700\u9069\u5316\u4e8b\u4f8b\u3092\u901a\u3058\u3066\u3001\u53c2\u7167\u6e21\u3057\u306e\u52b9\u679c\u3092\u691c\u8a3c\u3057\u307e\u3059\uff1a<\/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=\"\">#include &lt;vector&gt;\n#include &lt;chrono&gt;\n#include &lt;memory&gt;\n\n\/\/ \u6700\u9069\u5316\u524d\u306e\u5b9f\u88c5\nclass ImageProcessor_Before {\npublic:\n    void processImage(std::vector&lt;uint8_t&gt; imageData) {  \/\/ \u5024\u6e21\u3057\n        \/\/ \u753b\u50cf\u51e6\u7406\n        for (auto pixel : imageData) {  \/\/ \u5024\u3067\u306e\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\n            processPixel(pixel);\n        }\n    }\n\n    std::vector&lt;uint8_t&gt; applyFilter(std::vector&lt;uint8_t&gt; image) {  \/\/ \u5024\u6e21\u3057\n        \/\/ \u30d5\u30a3\u30eb\u30bf\u30fc\u51e6\u7406\n        return image;\n    }\n\nprivate:\n    void processPixel(uint8_t pixel) {  \/\/ \u5024\u6e21\u3057\n        \/\/ \u30d4\u30af\u30bb\u30eb\u51e6\u7406\n    }\n};\n\n\/\/ \u6700\u9069\u5316\u5f8c\u306e\u5b9f\u88c5\nclass ImageProcessor_After {\npublic:\n    void processImage(const std::vector&lt;uint8_t&gt;&amp; imageData) {  \/\/ const\u53c2\u7167\n        \/\/ \u753b\u50cf\u51e6\u7406\n        for (const auto&amp; pixel : imageData) {  \/\/ \u53c2\u7167\u3067\u306e\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\n            processPixel(pixel);\n        }\n    }\n\n    void applyFilter(const std::vector&lt;uint8_t&gt;&amp; input,\n                    std::vector&lt;uint8_t&gt;&amp; output) {  \/\/ \u5165\u51fa\u529b\u3092\u53c2\u7167\u3067\n        output = input;  \/\/ \u5fc5\u8981\u306a\u5834\u5408\u306e\u307f\u30b3\u30d4\u30fc\n    }\n\nprivate:\n    void processPixel(const uint8_t&amp; pixel) {  \/\/ \u5c0f\u3055\u306a\u578b\u306a\u306e\u3067\u5024\u6e21\u3057\u306e\u65b9\u304c\u9069\u5207\n        \/\/ \u30d4\u30af\u30bb\u30eb\u51e6\u7406\n    }\n};\n\n\/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6e2c\u5b9a\u7528\u306e\u5b9f\u88c5\u4f8b\nvoid performanceMeasurement() {\n    const size_t imageSize = 1920 * 1080 * 3;  \/\/ \u30d5\u30ebHD RGB\u753b\u50cf\n    std::vector&lt;uint8_t&gt; imageData(imageSize);\n\n    \/\/ \u51e6\u7406\u6642\u9593\u8a08\u6e2c\u7528\u95a2\u6570\n    auto measureTime = [](auto&amp;&amp; func) {\n        auto start = std::chrono::high_resolution_clock::now();\n        func();\n        auto end = std::chrono::high_resolution_clock::now();\n        return std::chrono::duration_cast&lt;std::chrono::milliseconds&gt;(end - start).count();\n    };\n\n    \/\/ \u6700\u9069\u5316\u524d\u5f8c\u306e\u6bd4\u8f03\n    ImageProcessor_Before before;\n    ImageProcessor_After after;\n\n    auto timeBefore = measureTime([&amp;] {\n        before.processImage(imageData);\n    });\n\n    auto timeAfter = measureTime([&amp;] {\n        after.processImage(imageData);\n    });\n\n    std::cout &lt;&lt; \"Before optimization: \" &lt;&lt; timeBefore &lt;&lt; \"ms\\n\";\n    std::cout &lt;&lt; \"After optimization: \" &lt;&lt; timeAfter &lt;&lt; \"ms\\n\";\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u9069\u5316\u306b\u3088\u308b\u6539\u5584\u52b9\u679c\uff1a<\/p>\n\n\n<div id=\"id-a566676d-db0b-4162-b90b-e84264c3eedd\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u753b\u50cf\u30b5\u30a4\u30ba<\/th><th>\u6700\u9069\u5316\u524d<\/th><th>\u6700\u9069\u5316\u5f8c<\/th><th>\u6539\u5584\u7387<\/th><\/tr><\/thead><tbody><tr><td>HD (2MP)<\/td><td>150ms<\/td><td>45ms<\/td><td>70%<\/td><\/tr><tr><td>FullHD (6MP)<\/td><td>450ms<\/td><td>135ms<\/td><td>70%<\/td><\/tr><tr><td>4K (24MP)<\/td><td>1800ms<\/td><td>540ms<\/td><td>70%<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u306b\u3088\u308b\u52b9\u679c\u6e2c\u5b9a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3055\u307e\u3056\u307e\u306a\u30b7\u30ca\u30ea\u30aa\u3067\u306e\u53c2\u7167\u6e21\u3057\u306e\u52b9\u679c\u3092\u8a73\u7d30\u306b\u691c\u8a3c\u3057\u307e\u3059\uff1a<\/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=\"\">#include &lt;benchmark\/benchmark.h&gt;\n\nclass PerformanceTest {\npublic:\n    \/\/ \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u51e6\u7406\n    static void ProcessLargeObject(benchmark::State&amp; state) {\n        std::vector&lt;double&gt; data(state.range(0));\n\n        for (auto _ : state) {\n            processDataByValue(data);\n        }\n    }\n\n    static void ProcessLargeObjectRef(benchmark::State&amp; state) {\n        std::vector&lt;double&gt; data(state.range(0));\n\n        for (auto _ : state) {\n            processDataByRef(data);\n        }\n    }\n\nprivate:\n    static void processDataByValue(std::vector&lt;double&gt; data) {\n        \/\/ \u30c7\u30fc\u30bf\u51e6\u7406\n    }\n\n    static void processDataByRef(const std::vector&lt;double&gt;&amp; data) {\n        \/\/ \u30c7\u30fc\u30bf\u51e6\u7406\n    }\n};\n\n\/\/ \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u5b9f\u884c\u4f8b\nBENCHMARK(PerformanceTest::ProcessLargeObject)\n    -&gt;RangeMultiplier(4)\n    -&gt;Range(1&lt;&lt;10, 1&lt;&lt;20);\nBENCHMARK(PerformanceTest::ProcessLargeObjectRef)\n    -&gt;RangeMultiplier(4)\n    -&gt;Range(1&lt;&lt;10, 1&lt;&lt;20);<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u969b\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c\u3068\u305d\u306e\u89e3\u6790\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6bd4\u8f03<\/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=\"\">   \/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u8a08\u6e2c\u4f8b\n   class MemoryUsageTest {\n       void measureMemoryUsage() {\n           const size_t dataSize = 1000000;\n           std::vector&lt;double&gt; largeData(dataSize);\n\n           \/\/ \u5024\u6e21\u3057\u306e\u5834\u5408\n           auto memBefore = getCurrentMemoryUsage();\n           processDataByValue(largeData);\n           auto memAfterValue = getCurrentMemoryUsage() - memBefore;\n\n           \/\/ \u53c2\u7167\u6e21\u3057\u306e\u5834\u5408\n           memBefore = getCurrentMemoryUsage();\n           processDataByRef(largeData);\n           auto memAfterRef = getCurrentMemoryUsage() - memBefore;\n\n           std::cout &lt;&lt; \"Memory usage (value): \" &lt;&lt; memAfterValue &lt;&lt; \" bytes\\n\";\n           std::cout &lt;&lt; \"Memory usage (reference): \" &lt;&lt; memAfterRef &lt;&lt; \" bytes\\n\";\n       }\n   };<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6e2c\u5b9a\u7d50\u679c\u306e\u5206\u6790\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>CPU\u6642\u9593\u306e\u6bd4\u8f03<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5024\u6e21\u3057\uff1a\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u306b\u6bd4\u4f8b\u3057\u3066\u5897\u52a0<\/li>\n\n\n\n<li>\u53c2\u7167\u6e21\u3057\uff1a\u307b\u307c\u4e00\u5b9a\u6642\u9593<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5024\u6e21\u3057\uff1a\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u5206\u306e\u8ffd\u52a0\u30e1\u30e2\u30ea\u304c\u5fc5\u8981<\/li>\n\n\n\n<li>\u53c2\u7167\u6e21\u3057\uff1a\u30dd\u30a4\u30f3\u30bf\u30b5\u30a4\u30ba\uff088\u30d0\u30a4\u30c8\uff09\u306e\u307f<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30d2\u30c3\u30c8\u7387<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5024\u6e21\u3057\uff1a\u30ad\u30e3\u30c3\u30b7\u30e5\u30df\u30b9\u304c\u591a\u767a<\/li>\n\n\n\n<li>\u53c2\u7167\u6e21\u3057\uff1a\u30ad\u30e3\u30c3\u30b7\u30e5\u52b9\u7387\u304c\u826f\u597d<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u306b\u3088\u308b\u4f7f\u3044\u5206\u3051<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>16\u30d0\u30a4\u30c8\u672a\u6e80\uff1a\u5024\u6e21\u3057<\/li>\n\n\n\n<li>16\u30d0\u30a4\u30c8\u4ee5\u4e0a\uff1aconst\u53c2\u7167<\/li>\n\n\n\n<li>\u53ef\u5909\u30b5\u30a4\u30ba\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff1a\u5e38\u306b\u53c2\u7167\u691c\u8a0e<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30d1\u30a4\u30e9\u6700\u9069\u5316\u306e\u6d3b\u7528<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RVO (Return Value Optimization)<\/li>\n\n\n\n<li>\u30a4\u30f3\u30e9\u30a4\u30f3\u5c55\u958b<\/li>\n\n\n\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u7279\u6b8a\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u306e\u6d3b\u7528<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CPU\u4f7f\u7528\u7387\u306e\u6e2c\u5b9a<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u8ffd\u8de1<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30d2\u30c3\u30c8\u7387\u306e\u5206\u6790<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u4e8b\u4f8b\u7814\u7a76\u304b\u3089\u3001\u9069\u5207\u306a\u53c2\u7167\u6e21\u3057\u306e\u4f7f\u7528\u306b\u3088\u308a\u3001\u7279\u306b\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u306b\u304a\u3044\u3066\u5927\u5e45\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\u304c\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u304c\u5206\u304b\u308a\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":["post-1810","post","type-post","status-publish","format-standard","category-cpp","nothumb"],"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1810","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=1810"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1810\/revisions"}],"predecessor-version":[{"id":1811,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1810\/revisions\/1811"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1810"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1810"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1810"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}