{"id":1733,"date":"2025-03-24T08:50:03","date_gmt":"2025-03-23T23:50:03","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1733"},"modified":"2025-03-24T08:50:03","modified_gmt":"2025-03-23T23:50:03","slug":"c%e3%81%aeexplicit%e6%8c%87%e5%ae%9a%e5%ad%90%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e6%84%8f%e5%9b%b3%e3%81%97%e3%81%aa%e3%81%84%e5%9e%8b%e5%a4%89%e6%8f%9b%e3%82%92%e9%98%b2%e3%81%8e","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1733","title":{"rendered":"C++\u306eexplicit\u6307\u5b9a\u5b50\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u610f\u56f3\u3057\u306a\u3044\u578b\u5909\u63db\u3092\u9632\u304e\u3001\u5805\u7262\u306a\u30b3\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b7\u3064\u306e\u5b9f\u8df5\u4f8b"},"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\">explicit\u6307\u5b9a\u5b50\u3068\u306f\uff1a\u57fa\u672c\u6982\u5ff5\u3068\u91cd\u8981\u6027<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u3082\u305f\u3089\u3059\u4e88\u671f\u305b\u306c\u30d0\u30b0<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">explicit\u6307\u5b9a\u5b50\u306b\u3088\u308b\u30b3\u30fc\u30c9\u306e\u5b89\u5168\u6027\u5411\u4e0a<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">explicit\u6307\u5b9a\u5b50\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u30b7\u30f3\u30b0\u30eb\u30d1\u30e9\u30e1\u30fc\u30bf\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u306e\u6d3b\u7528<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u5909\u63db\u6f14\u7b97\u5b50\u3067\u306e\u4f7f\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u306e\u5fdc\u7528<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">explicit\u3092\u4f7f\u7528\u3059\u3079\u304d7\u3064\u306e\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">1. \u6570\u5024\u578b\u3092\u53d7\u3051\u53d6\u308b\u30af\u30e9\u30b9\u306e\u8a2d\u8a08\u6642<\/a>      <\/li>      <li>        <a href=\"#i-9\">2. STL\u30b3\u30f3\u30c6\u30ca\u306e\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-10\">3. \u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u81ea\u4f5c\u6642<\/a>      <\/li>      <li>        <a href=\"#i-11\">4. \u30d5\u30a1\u30af\u30c8\u30ea\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-12\">5. \u6f14\u7b97\u5b50\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3067\u306e\u4f7f\u7528<\/a>      <\/li>      <li>        <a href=\"#i-13\">6. \u30ea\u30bd\u30fc\u30b9\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u30af\u30e9\u30b9\u306e\u8a2d\u8a08<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-14\">7. \u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u306e\u5b9f\u88c5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-15\">explicit\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-16\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u3068\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li>        <a href=\"#i-17\">\u3088\u304f\u3042\u308b\u8aa4\u7528\u3068\u305d\u306e\u56de\u907f\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u306e\u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-19\">C++20\u4ee5\u964d\u306eexplicit\u306e\u65b0\u6a5f\u80fd<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-20\">\u6761\u4ef6\u4ed8\u304dexplicit\u6307\u5b9a\u306e\u6d3b\u7528\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-21\">\u65b0\u3057\u3044\u69cb\u6587\u3068\u4e92\u63db\u6027\u306e\u8003\u616e<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-22\">\u5b9f\u8df5\u7684\u306a\u30c7\u30d0\u30c3\u30b0\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-23\">\u30b3\u30f3\u30d1\u30a4\u30e9\u30a8\u30e9\u30fc\u306e\u89e3\u8aad\u3068\u5bfe\u51e6\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-24\">\u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30e9\u30fc\u306e\u4e88\u9632\u3068\u5bfe\u7b56<\/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\">explicit\u6307\u5b9a\u5b50\u3068\u306f\uff1a\u57fa\u672c\u6982\u5ff5\u3068\u91cd\u8981\u6027<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u3082\u305f\u3089\u3059\u4e88\u671f\u305b\u306c\u30d0\u30b0<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C++\u8a00\u8a9e\u306b\u304a\u3051\u308b\u6697\u9ed9\u306e\u578b\u5909\u63db\u306f\u3001\u30b3\u30fc\u30c9\u306e\u67d4\u8edf\u6027\u3092\u9ad8\u3081\u308b\u4e00\u65b9\u3067\u3001\u4e88\u671f\u305b\u306c\u30d0\u30b0\u306e\u539f\u56e0\u3068\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u4f8b\u3067\u3001\u305d\u306e\u554f\u984c\u70b9\u3092\u898b\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=\"\">class StringBuffer {\npublic:\n    \/\/ \u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u3066\u6587\u5b57\u5217\u30d0\u30c3\u30d5\u30a1\u3092\u4f5c\u6210\u3059\u308b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n    StringBuffer(size_t size) : buffer_(new char[size]), size_(size) {\n        \/\/ \u30d0\u30c3\u30d5\u30a1\u306e\u521d\u671f\u5316\u51e6\u7406\n    }\n\n    ~StringBuffer() {\n        delete[] buffer_;\n    }\n\nprivate:\n    char* buffer_;\n    size_t size_;\n};\n\nvoid processBuffer(const StringBuffer&amp; buf) {\n    \/\/ \u30d0\u30c3\u30d5\u30a1\u51e6\u7406\u30ed\u30b8\u30c3\u30af\n}\n\nint main() {\n    \/\/ \u610f\u56f3\u3057\u306a\u3044\u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u767a\u751f\n    processBuffer(100);    \/\/ int \u304b\u3089 StringBuffer \u3078\u306e\u6697\u9ed9\u306e\u5909\u63db\n\n    return 0;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001<code>processBuffer(100)<\/code>\u306e\u547c\u3073\u51fa\u3057\u6642\u306b\u3001\u6574\u6570\u5024<code>100<\/code>\u304c<code>StringBuffer<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u6697\u9ed9\u7684\u306b\u5909\u63db\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u4e0d\u660e\u78ba\u306b\u306a\u308b<\/li>\n\n\n\n<li>\u4e88\u671f\u305b\u306c\u30e1\u30e2\u30ea\u5272\u308a\u5f53\u3066\u304c\u767a\u751f\u3059\u308b<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff<\/li>\n\n\n\n<li>\u30c7\u30d0\u30c3\u30b0\u304c\u56f0\u96e3\u306b\u306a\u308b<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">explicit\u6307\u5b9a\u5b50\u306b\u3088\u308b\u30b3\u30fc\u30c9\u306e\u5b89\u5168\u6027\u5411\u4e0a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>explicit<\/code>\u6307\u5b9a\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u308c\u3089\u306e\u554f\u984c\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\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 StringBuffer {\npublic:\n    \/\/ explicit\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u8ffd\u52a0\n    explicit StringBuffer(size_t size) : buffer_(new char[size]), size_(size) {\n        \/\/ \u30d0\u30c3\u30d5\u30a1\u306e\u521d\u671f\u5316\u51e6\u7406\n    }\n\n    ~StringBuffer() {\n        delete[] buffer_;\n    }\n\nprivate:\n    char* buffer_;\n    size_t size_;\n};\n\nint main() {\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u7981\u6b62\u3055\u308c\u308b\n    \/\/ processBuffer(100);  \n\n    \/\/ \u6b63\u3057\u3044\u4f7f\u7528\u65b9\u6cd5\n    processBuffer(StringBuffer(100));  \/\/ \u660e\u793a\u7684\u306a\u5909\u63db\n\n    return 0;\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>explicit<\/code>\u6307\u5b9a\u5b50\u306e\u4e3b\u306a\u5229\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u306e\u660e\u78ba\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u547c\u3073\u51fa\u3057\u304c\u660e\u793a\u7684\u306b\u5fc5\u8981\u3068\u306a\u308a\u3001\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u660e\u78ba\u306b\u306a\u308a\u307e\u3059<\/li>\n\n\n\n<li>\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u8aa4\u7528\u3092\u9632\u304e\u3084\u3059\u304f\u306a\u308a\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u578b\u5b89\u5168\u6027\u306e\u5411\u4e0a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u610f\u56f3\u3057\u306a\u3044\u578b\u5909\u63db\u3092\u9632\u304e\u3001\u578b\u95a2\u9023\u306e\u30d0\u30b0\u3092\u65e9\u671f\u306b\u767a\u898b\u3067\u304d\u307e\u3059<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30a8\u30e9\u30fc\u3092\u691c\u51fa\u3067\u304d\u308b\u305f\u3081\u3001\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u3092\u9632\u3052\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4fdd\u5b88\u6027\u306e\u5411\u4e0a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u306e\u52d5\u4f5c\u304c\u4e88\u6e2c\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059<\/li>\n\n\n\n<li>\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u304c\u5b89\u5168\u306b\u884c\u3048\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u8981\u306a\u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\u3092\u9632\u304e\u307e\u3059<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u306e\u52b9\u7387\u304c\u5411\u4e0a\u3057\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><code>explicit<\/code>\u6307\u5b9a\u5b50\u306f\u3001\u7279\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u91cd\u8981\u3067\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b7\u30f3\u30b0\u30eb\u30d1\u30e9\u30e1\u30fc\u30bf\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5b9a\u7fa9\u6642<\/li>\n\n\n\n<li>\u578b\u5909\u63db\u6f14\u7b97\u5b50\u306e\u5b9f\u88c5\u6642<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u30af\u30e9\u30b9\u306e\u8a2d\u8a08\u6642<\/li>\n\n\n\n<li>STL\u30b3\u30f3\u30c6\u30ca\u306e\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u5b9f\u88c5\u6642<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u9069\u5207\u306a<code>explicit<\/code>\u6307\u5b9a\u5b50\u306e\u4f7f\u7528\u306f\u3001\u30e2\u30c0\u30f3C++\u306b\u304a\u3051\u308b\u5805\u7262\u306a\u30b3\u30fc\u30c9\u8a2d\u8a08\u306e\u57fa\u672c\u539f\u5247\u306e1\u3064\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">explicit\u6307\u5b9a\u5b50\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u30b7\u30f3\u30b0\u30eb\u30d1\u30e9\u30e1\u30fc\u30bf\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u306e\u6d3b\u7528<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b7\u30f3\u30b0\u30eb\u30d1\u30e9\u30e1\u30fc\u30bf\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u3001\u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u767a\u751f\u3057\u3084\u3059\u3044\u4ee3\u8868\u7684\u306a\u5834\u9762\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001<code>explicit<\/code>\u6307\u5b9a\u5b50\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u4f8b\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 NetworkConnection {\npublic:\n    \/\/ \u63a5\u7d9a\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3092\u6307\u5b9a\u3059\u308b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n    explicit NetworkConnection(int timeoutSeconds)\n        : timeout_(timeoutSeconds) {\n        \/\/ \u63a5\u7d9a\u306e\u521d\u671f\u5316\u51e6\u7406\n    }\n\n    bool connect() {\n        \/\/ \u63a5\u7d9a\u51e6\u7406\u306e\u5b9f\u88c5\n        return true;\n    }\n\nprivate:\n    int timeout_;\n};\n\n\/\/ \u63a5\u7d9a\u3092\u51e6\u7406\u3059\u308b\u95a2\u6570\nvoid processConnection(const NetworkConnection&amp; conn) {\n    \/\/ \u63a5\u7d9a\u51e6\u7406\n}\n\nint main() {\n    \/\/ OK: \u660e\u793a\u7684\u306a\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u547c\u3073\u51fa\u3057\n    NetworkConnection conn1(30);\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc: int \u304b\u3089 NetworkConnection \u3078\u306e\u6697\u9ed9\u306e\u5909\u63db\u306f\u7981\u6b62\n    \/\/ processConnection(60);\n\n    \/\/ OK: \u660e\u793a\u7684\u306a\u5909\u63db\n    processConnection(NetworkConnection(60));\n\n    return 0;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u5909\u63db\u6f14\u7b97\u5b50\u3067\u306e\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C++11\u4ee5\u964d\u3001\u5909\u63db\u6f14\u7b97\u5b50\u306b\u3082<code>explicit<\/code>\u3092\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\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 SafeInt {\npublic:\n    SafeInt(int value) : value_(value) {}\n\n    \/\/ explicit\u306a\u5909\u63db\u6f14\u7b97\u5b50\n    explicit operator bool() const {\n        return value_ != 0;\n    }\n\n    \/\/ \u901a\u5e38\u306e\u7b97\u8853\u6f14\u7b97\u5b50\n    SafeInt operator+(const SafeInt&amp; other) const {\n        return SafeInt(value_ + other.value_);\n    }\n\nprivate:\n    int value_;\n};\n\nvoid example() {\n    SafeInt num1(42);\n    SafeInt num2(0);\n\n    \/\/ OK: \u660e\u793a\u7684\u306a\u6761\u4ef6\u3067\u306e\u4f7f\u7528\n    if (static_cast&lt;bool&gt;(num1)) {\n        \/\/ \u51e6\u7406\n    }\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc: \u6697\u9ed9\u306e\u5909\u63db\u306f\u7981\u6b62\n    \/\/ bool b = num1;\n\n    \/\/ OK: \u660e\u793a\u7684\u306a\u5909\u63db\n    bool b = static_cast&lt;bool&gt;(num1);\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u306e\u5fdc\u7528<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u306e<code>explicit<\/code>\u306e\u4f7f\u7528\u306f\u3001\u7279\u306b\u578b\u5b89\u5168\u6027\u304c\u91cd\u8981\u306a\u5834\u9762\u3067\u6709\u52b9\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=\"\">template&lt;typename T&gt;\nclass SmartContainer {\npublic:\n    \/\/ \u30b5\u30a4\u30ba\u6307\u5b9a\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n    explicit SmartContainer(size_t size)\n        : data_(new T[size]), size_(size) {}\n\n    \/\/ \u4ed6\u306e\u30b3\u30f3\u30c6\u30ca\u304b\u3089\u306e\u5909\u63db\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n    template&lt;typename U&gt;\n    explicit SmartContainer(const SmartContainer&lt;U&gt;&amp; other)\n        : data_(new T[other.size()]), size_(other.size()) {\n        \/\/ \u30c7\u30fc\u30bf\u306e\u30b3\u30d4\u30fc\u3068\u578b\u5909\u63db\n        for (size_t i = 0; i &lt; size_; ++i) {\n            data_[i] = static_cast&lt;T&gt;(other[i]);\n        }\n    }\n\n    \/\/ \u30c7\u30b9\u30c8\u30e9\u30af\u30bf\n    ~SmartContainer() {\n        delete[] data_;\n    }\n\n    \/\/ \u30a2\u30af\u30bb\u30b5\u30e1\u30bd\u30c3\u30c9\n    size_t size() const { return size_; }\n    const T&amp; operator[](size_t index) const { return data_[index]; }\n    T&amp; operator[](size_t index) { return data_[index]; }\n\nprivate:\n    T* data_;\n    size_t size_;\n};\n\nvoid example() {\n    SmartContainer&lt;double&gt; doubles(5);  \/\/ OK\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc: size_t \u304b\u3089 SmartContainer \u3078\u306e\u6697\u9ed9\u306e\u5909\u63db\u306f\u7981\u6b62\n    \/\/ SmartContainer&lt;int&gt; ints = 10;\n\n    \/\/ OK: \u660e\u793a\u7684\u306a\u69cb\u7bc9\n    SmartContainer&lt;int&gt; ints(10);\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc: \u6697\u9ed9\u306e\u578b\u5909\u63db\u306f\u7981\u6b62\n    \/\/ SmartContainer&lt;int&gt; converted = doubles;\n\n    \/\/ OK: \u660e\u793a\u7684\u306a\u5909\u63db\n    SmartContainer&lt;int&gt; converted(doubles);\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30b3\u30fc\u30c9\u4f8b\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3092\u793a\u3057\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u578b\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u578b\u5b89\u5168\u6027\u306e\u78ba\u4fdd<\/li>\n\n\n\n<li>\u7570\u306a\u308b\u578b\u9593\u306e\u5909\u63db\u306b\u304a\u3051\u308b\u660e\u793a\u7684\u306a\u5236\u5fa1<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u3092\u4f34\u3046\u30af\u30e9\u30b9\u3067\u306e\u5b89\u5168\u306a\u578b\u5909\u63db<\/li>\n\n\n\n<li>\u30b3\u30f3\u30c6\u30ca\u985e\u3067\u306e\u9069\u5207\u306a<code>explicit<\/code>\u306e\u4f7f\u7528\u65b9\u6cd5<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u7279\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u9762\u3067\u6709\u52b9\u3067\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5927\u898f\u6a21\u306a\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u30c7\u30fc\u30bf\u578b\u306e\u5b89\u5168\u306a\u5909\u63db<\/li>\n\n\n\n<li>\u30e9\u30a4\u30d6\u30e9\u30eaAPI\u306e\u8a2d\u8a08<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u5834\u9762\u3067\u306e\u30e1\u30e2\u30ea\u7ba1\u7406<\/li>\n\n\n\n<li>\u578b\u5b89\u5168\u6027\u304c\u91cd\u8981\u306a\u91d1\u878d\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u95a2\u9023\u306e\u30b3\u30fc\u30c9<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u5177\u4f53\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3068\u3068\u3082\u306b\u3001<code>explicit<\/code>\u3092\u4f7f\u7528\u3059\u3079\u304d7\u3064\u306e\u91cd\u8981\u306a\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3\u3092\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">explicit\u3092\u4f7f\u7528\u3059\u3079\u304d7\u3064\u306e\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">1. \u6570\u5024\u578b\u3092\u53d7\u3051\u53d6\u308b\u30af\u30e9\u30b9\u306e\u8a2d\u8a08\u6642<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6570\u5024\u578b\u3092\u6271\u3046\u30af\u30e9\u30b9\u3067\u306f\u3001\u610f\u56f3\u3057\u306a\u3044\u6570\u5024\u5909\u63db\u3092\u9632\u3050\u305f\u3081\u306b<code>explicit<\/code>\u306e\u4f7f\u7528\u304c\u91cd\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=\"\">class Percentage {\npublic:\n    \/\/ 0-100\u306e\u7bc4\u56f2\u3067\u5024\u3092\u53d7\u3051\u53d6\u308b\n    explicit Percentage(double value) {\n        if (value &lt; 0.0 || value &gt; 100.0) {\n            throw std::out_of_range(\"Percentage must be between 0 and 100\");\n        }\n        value_ = value;\n    }\n\n    double getValue() const { return value_; }\n\nprivate:\n    double value_;\n};\n\nvoid calculateDiscount(const Percentage&amp; discount) {\n    \/\/ \u5272\u5f15\u8a08\u7b97\u306e\u30ed\u30b8\u30c3\u30af\n}\n\nint main() {\n    \/\/ OK: \u660e\u793a\u7684\u306a\u69cb\u7bc9\n    Percentage valid(75.0);\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc: \u6697\u9ed9\u306e\u5909\u63db\u3092\u9632\u3050\n    \/\/ calculateDiscount(50.0);\n\n    \/\/ OK: \u660e\u793a\u7684\u306a\u5909\u63db\n    calculateDiscount(Percentage(50.0));\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">2. STL\u30b3\u30f3\u30c6\u30ca\u306e\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">STL\u30b3\u30f3\u30c6\u30ca\u3092\u30e9\u30c3\u30d7\u3059\u308b\u969b\u306f\u3001\u610f\u56f3\u3057\u306a\u3044\u5909\u63db\u3092\u9632\u3050\u305f\u3081\u306b<code>explicit<\/code>\u3092\u4f7f\u7528\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=\"\">template&lt;typename T&gt;\nclass SafeVector {\npublic:\n    explicit SafeVector(size_t initialSize)\n        : data_(initialSize) {}\n\n    \/\/ \u30a4\u30c6\u30ec\u30fc\u30bf\u7bc4\u56f2\u304b\u3089\u306e\u69cb\u7bc9\n    template&lt;typename Iterator&gt;\n    explicit SafeVector(Iterator begin, Iterator end)\n        : data_(begin, end) {}\n\n    \/\/ \u5883\u754c\u30c1\u30a7\u30c3\u30af\u4ed8\u304d\u306e\u30a2\u30af\u30bb\u30b9\n    T&amp; at(size_t index) {\n        return data_.at(index);  \/\/ std::out_of_range\u4f8b\u5916\u3092\u6295\u3052\u308b\u53ef\u80fd\u6027\u3042\u308a\n    }\n\n    size_t size() const { return data_.size(); }\n\nprivate:\n    std::vector&lt;T&gt; data_;\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">3. \u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u81ea\u4f5c\u6642<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ab\u30b9\u30bf\u30e0\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u5b9f\u88c5\u3067\u306f\u3001\u751f\u30dd\u30a4\u30f3\u30bf\u304b\u3089\u306e\u6697\u9ed9\u306e\u5909\u63db\u3092\u9632\u3050\u305f\u3081\u306b<code>explicit<\/code>\u304c\u5fc5\u9808\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=\"\">template&lt;typename T&gt;\nclass ScopedPtr {\npublic:\n    explicit ScopedPtr(T* ptr = nullptr) : ptr_(ptr) {}\n\n    ~ScopedPtr() {\n        delete ptr_;\n    }\n\n    \/\/ \u30e0\u30fc\u30d6\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\n    ScopedPtr(ScopedPtr&amp;&amp; other) noexcept\n        : ptr_(other.ptr_) {\n        other.ptr_ = nullptr;\n    }\n\n    \/\/ \u30b3\u30d4\u30fc\u7981\u6b62\n    ScopedPtr(const ScopedPtr&amp;) = delete;\n    ScopedPtr&amp; operator=(const ScopedPtr&amp;) = delete;\n\n    T* get() const { return ptr_; }\n    T&amp; operator*() const { return *ptr_; }\n    T* operator-&gt;() const { return ptr_; }\n\nprivate:\n    T* ptr_;\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">4. \u30d5\u30a1\u30af\u30c8\u30ea\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d5\u30a1\u30af\u30c8\u30ea\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u306e\u5236\u5fa1\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u306b<code>explicit<\/code>\u3092\u4f7f\u7528\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 Widget {\nprotected:\n    explicit Widget(int id) : id_(id) {}\n\npublic:\n    virtual ~Widget() = default;\n    static std::unique_ptr&lt;Widget&gt; create(int id);\n    int getId() const { return id_; }\n\nprivate:\n    int id_;\n};\n\nclass SpecialWidget : public Widget {\n    friend class Widget;  \/\/ \u30d5\u30a1\u30af\u30c8\u30ea\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u306e\u30a2\u30af\u30bb\u30b9\u3092\u8a31\u53ef\n    explicit SpecialWidget(int id) : Widget(id) {}\n};\n\nstd::unique_ptr&lt;Widget&gt; Widget::create(int id) {\n    return std::make_unique&lt;SpecialWidget&gt;(id);\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">5. \u6f14\u7b97\u5b50\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3067\u306e\u4f7f\u7528<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u578b\u5909\u63db\u6f14\u7b97\u5b50\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3067\u306f\u3001\u610f\u56f3\u3057\u306a\u3044\u5909\u63db\u3092\u9632\u3050\u305f\u3081\u306b<code>explicit<\/code>\u3092\u4f7f\u7528\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 Rational {\npublic:\n    Rational(int num = 0, int den = 1)\n        : numerator_(num), denominator_(den) {}\n\n    \/\/ double \u3078\u306e\u660e\u793a\u7684\u306a\u5909\u63db\n    explicit operator double() const {\n        return static_cast&lt;double&gt;(numerator_) \/ denominator_;\n    }\n\n    \/\/ bool \u3078\u306e\u660e\u793a\u7684\u306a\u5909\u63db\n    explicit operator bool() const {\n        return numerator_ != 0;\n    }\n\nprivate:\n    int numerator_;\n    int denominator_;\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">6. \u30ea\u30bd\u30fc\u30b9\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u30af\u30e9\u30b9\u306e\u8a2d\u8a08<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u30af\u30e9\u30b9\u3067\u306f\u3001\u30ea\u30bd\u30fc\u30b9\u306e\u5272\u308a\u5f53\u3066\u3068\u89e3\u653e\u3092\u660e\u78ba\u306b\u5236\u5fa1\u3059\u308b\u305f\u3081\u306b<code>explicit<\/code>\u3092\u4f7f\u7528\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 FileHandle {\npublic:\n    explicit FileHandle(const std::string&amp; filename)\n        : file_(std::fopen(filename.c_str(), \"r\")) {\n        if (!file_) {\n            throw std::runtime_error(\"Failed to open file\");\n        }\n    }\n\n    ~FileHandle() {\n        if (file_) {\n            std::fclose(file_);\n        }\n    }\n\n    \/\/ \u30e0\u30fc\u30d6\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\n    FileHandle(FileHandle&amp;&amp; other) noexcept : file_(other.file_) {\n        other.file_ = nullptr;\n    }\n\n    \/\/ \u30b3\u30d4\u30fc\u7981\u6b62\n    FileHandle(const FileHandle&amp;) = delete;\n    FileHandle&amp; operator=(const FileHandle&amp;) = delete;\n\n    FILE* get() const { return file_; }\n\nprivate:\n    FILE* file_;\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">7. \u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6c4e\u7528\u7684\u306a\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u3067\u306f\u3001\u578b\u306e\u5b89\u5168\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b<code>explicit<\/code>\u3092\u4f7f\u7528\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 Timespan {\npublic:\n    explicit Timespan(double seconds) : seconds_(seconds) {\n        if (seconds &lt; 0) {\n            throw std::invalid_argument(\"Negative timespan not allowed\");\n        }\n    }\n\n    static Timespan fromMinutes(double minutes) {\n        return Timespan(minutes * 60.0);\n    }\n\n    static Timespan fromHours(double hours) {\n        return Timespan(hours * 3600.0);\n    }\n\n    double totalSeconds() const { return seconds_; }\n    double totalMinutes() const { return seconds_ \/ 60.0; }\n    double totalHours() const { return seconds_ \/ 3600.0; }\n\nprivate:\n    double seconds_;\n};<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30b7\u30c1\u30e5\u30a8\u30fc\u30b7\u30e7\u30f3\u3067\u306e<code>explicit<\/code>\u306e\u4f7f\u7528\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5229\u70b9\u3092\u3082\u305f\u3089\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u306e\u660e\u78ba\u5316<\/li>\n\n\n\n<li>\u578b\u5b89\u5168\u6027\u306e\u5411\u4e0a<\/li>\n\n\n\n<li>\u30d0\u30b0\u306e\u65e9\u671f\u767a\u898b<\/li>\n\n\n\n<li>\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u306e\u5411\u4e0a<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u52b9\u7387\u5316<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u306e\u5bb9\u6613\u3055<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u306b\u95a2\u9023\u3059\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-15\">explicit\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u3068\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>explicit<\/code>\u6307\u5b9a\u5b50\u306e\u9069\u5207\u306a\u4f7f\u7528\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u76f4\u63a5\u7684\u306a\u5f71\u97ff\u3092\u4e0e\u3048\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=\"\">\/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u89b3\u70b9\u304b\u3089\u898b\u305f\u826f\u3044\u5b9f\u88c5\u4f8b\nclass OptimizedBuffer {\npublic:\n    \/\/ \u5927\u304d\u306a\u30d0\u30c3\u30d5\u30a1\u3092\u6271\u3046\u305f\u3081\u3001\u610f\u56f3\u3057\u306a\u3044\u6697\u9ed9\u306e\u5909\u63db\u3092\u9632\u3050\n    explicit OptimizedBuffer(size_t size)\n        : data_(new char[size]), size_(size) {}\n\n    \/\/ \u30e0\u30fc\u30d6\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f explicit\u306b\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044\n    OptimizedBuffer(OptimizedBuffer&amp;&amp; other) noexcept\n        : data_(other.data_), size_(other.size_) {\n        other.data_ = nullptr;\n        other.size_ = 0;\n    }\n\n    \/\/ \u30b3\u30d4\u30fc\u306f\u9ad8\u30b3\u30b9\u30c8\u306a\u306e\u3067 explicit \u3067\u5236\u9650\n    explicit OptimizedBuffer(const OptimizedBuffer&amp; other)\n        : data_(new char[other.size_]), size_(other.size_) {\n        std::memcpy(data_, other.data_, size_);\n    }\n\n    ~OptimizedBuffer() {\n        delete[] data_;\n    }\n\nprivate:\n    char* data_;\n    size_t size_;\n};\n\n\/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\nvoid processLargeBuffer(const OptimizedBuffer&amp; buffer) {\n    \/\/ \u51e6\u7406\u30ed\u30b8\u30c3\u30af\n}\n\nvoid example() {\n    \/\/ OK: \u660e\u793a\u7684\u306a\u69cb\u7bc9\n    OptimizedBuffer buf1(1024);\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc: \u30b5\u30a4\u30ba\u304b\u3089\u306e\u6697\u9ed9\u306e\u5909\u63db\u3092\u9632\u3050\n    \/\/ processLargeBuffer(2048);\n\n    \/\/ OK: \u660e\u793a\u7684\u306a\u30b3\u30d4\u30fc\n    OptimizedBuffer buf2(buf1);  \/\/ \u660e\u793a\u7684\u306a\u30b3\u30d4\u30fc\u304c\u5fc5\u8981\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e0d\u8981\u306a\u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\u3092\u9632\u6b62<\/li>\n\n\n\n<li>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30d4\u30fc\u3092\u5236\u5fa1<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u5272\u308a\u5f53\u3066\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u79fb\u52d5\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\u306e\u52b9\u7387\u7684\u306a\u6d3b\u7528<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u3088\u304f\u3042\u308b\u8aa4\u7528\u3068\u305d\u306e\u56de\u907f\u65b9\u6cd5<\/h3>\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\u3068\u4fee\u6b63\u4f8b\nclass DataContainer {\npublic:\n    \/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3: \u5fc5\u8981\u306e\u306a\u3044 explicit\n    \/\/ explicit DataContainer() = default;  \/\/ \u4e0d\u8981\n\n    \/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3: explicit\u306b\u3059\u3079\u304d\u3067\u306f\u306a\u3044\u5909\u63db\n    \/\/ explicit operator std::string_view() const { return data_; }  \/\/ \u4e0d\u8981\n\n    \/\/ \u6b63\u3057\u3044\u4f7f\u7528\u4f8b: \u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u5b89\u5168\u306a\u5834\u5408\n    operator std::string_view() const { return data_; }\n\n    \/\/ \u6b63\u3057\u3044\u4f7f\u7528\u4f8b: \u5371\u967a\u306a\u5909\u63db\u3092\u9632\u3050\n    explicit DataContainer(size_t size)\n        : data_(size, '\\0') {}\n\nprivate:\n    std::string data_;\n};\n\n\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3: \u4e0d\u9069\u5207\u306a explicit \u306e\u4f7f\u7528\nclass Counter {\npublic:\n    \/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3: \u5c0f\u3055\u306a\u5024\u578b\u306b\u5bfe\u3059\u308b\u4e0d\u8981\u306a explicit\n    \/\/ explicit Counter(int value) : value_(value) {}  \/\/ \u904e\u5270\u306a\u5236\u9650\n\n    \/\/ \u6b63\u3057\u3044\u5b9f\u88c5: \u5024\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\n    Counter(int value) {\n        if (value &lt; 0) {\n            throw std::invalid_argument(\"Counter value must be non-negative\");\n        }\n        value_ = value;\n    }\n\nprivate:\n    int value_;\n};<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3088\u304f\u3042\u308b\u8aa4\u7528\u3092\u907f\u3051\u308b\u305f\u3081\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3078\u306e\u4e0d\u8981\u306a<code>explicit<\/code>\u3092\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u5b89\u5168\u306a\u5909\u63db\u6f14\u7b97\u5b50\u306b\u306f<code>explicit<\/code>\u3092\u4f7f\u7528\u3057\u306a\u3044<\/li>\n\n\n\n<li>\u5c0f\u3055\u306a\u5024\u578b\u306e\u5909\u63db\u306b\u5bfe\u3059\u308b\u904e\u5270\u306a\u5236\u9650\u3092\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u30b3\u30d4\u30fc\/\u30e0\u30fc\u30d6\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3078\u306e\u4e0d\u8981\u306a<code>explicit<\/code>\u3092\u907f\u3051\u308b<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u306e\u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c8<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u6642\u306e<code>explicit<\/code>\u306b\u95a2\u3059\u308b\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b7\u30f3\u30b0\u30eb\u30d1\u30e9\u30e1\u30fc\u30bf\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u610f\u56f3\u3057\u306a\u3044\u578b\u5909\u63db\u306e\u30ea\u30b9\u30af\u3092\u8a55\u4fa1<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u3092\u78ba\u8a8d<\/li>\n\n\n\n<li>\u4f7f\u7528\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u59a5\u5f53\u6027\u30c1\u30a7\u30c3\u30af<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u578b\u5909\u63db\u6f14\u7b97\u5b50<\/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 ReviewExample {\n   public:\n       \/\/ \u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c81: \u5371\u967a\u306a\u5909\u63db\u306e\u5236\u5fa1\n       explicit operator bool() const {\n           return isValid();\n       }\n\n       \/\/ \u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c82: \u5b89\u5168\u306a\u5909\u63db\u306e\u8a31\u53ef\n       operator std::string_view() const {\n           return data_;\n       }\n\n   private:\n       bool isValid() const;\n       std::string data_;\n   };<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u5272\u308a\u5f53\u3066\u306e\u5236\u5fa1<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u306e\u6240\u6709\u6a29\u79fb\u8ee2\u306e\u660e\u78ba\u3055<\/li>\n\n\n\n<li>\u4f8b\u5916\u5b89\u5168\u6027\u306e\u78ba\u4fdd<\/li>\n<\/ul>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8003\u616e\u4e8b\u9805<\/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 ReviewPerformance {\n   public:\n       \/\/ \u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c83: \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30d4\u30fc\u5236\u5fa1\n       explicit ReviewPerformance(const std::vector&lt;int&gt;&amp; data)\n           : data_(data) {}\n\n       \/\/ \u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c84: \u30e0\u30fc\u30d6\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\u306e\u6700\u9069\u5316\n       ReviewPerformance(ReviewPerformance&amp;&amp; other) noexcept = default;\n\n   private:\n       std::vector&lt;int&gt; data_;\n   };<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u52b9\u679c\u7684\u306a\u5b9f\u65bd\u306e\u305f\u3081\u306b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e00\u8cab\u6027\u306e\u3042\u308b\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04\u306e\u9069\u7528<\/li>\n\n\n\n<li>\u81ea\u52d5\u5316\u3055\u308c\u305f\u30b3\u30fc\u30c9\u89e3\u6790\u30c4\u30fc\u30eb\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6307\u6a19\u306e\u7d99\u7d9a\u7684\u306a\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/li>\n\n\n\n<li>\u30c1\u30fc\u30e0\u5185\u3067\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306e\u5171\u6709<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u6307\u91dd\u306b\u5f93\u3046\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001C++20\u4ee5\u964d\u3067\u306e<code>explicit<\/code>\u306e\u65b0\u6a5f\u80fd\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-19\">C++20\u4ee5\u964d\u306eexplicit\u306e\u65b0\u6a5f\u80fd<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">\u6761\u4ef6\u4ed8\u304dexplicit\u6307\u5b9a\u306e\u6d3b\u7528\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C++20\u3067\u306f\u3001\u6761\u4ef6\u4ed8\u304d<code>explicit<\/code>\u6307\u5b9a\u304c\u5c0e\u5165\u3055\u308c\u3001\u3088\u308a\u67d4\u8edf\u306a\u578b\u5909\u63db\u306e\u5236\u5fa1\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\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=\"\">template&lt;typename T&gt;\nclass SmartNumber {\npublic:\n    \/\/ \u6574\u6570\u578b\u306e\u5834\u5408\u306e\u307fexplicit\u3068\u3059\u308b\u6761\u4ef6\u4ed8\u304d\u6307\u5b9a\n    template&lt;typename U&gt;\n    explicit(std::integral&lt;U&gt;) SmartNumber(U value)\n        : value_(static_cast&lt;T&gt;(value)) {}\n\n    \/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u306e\u5834\u5408\u306e\u307fexplicit\u3068\u3059\u308b\n    template&lt;typename U&gt;\n    explicit(std::floating_point&lt;U&gt;) SmartNumber(U value)\n        : value_(static_cast&lt;T&gt;(value)) {}\n\n    T getValue() const { return value_; }\n\nprivate:\n    T value_;\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid example() {\n    \/\/ \u6574\u6570\u578b\u304b\u3089\u306e\u5909\u63db\u306f\u660e\u793a\u7684\u306b\u5fc5\u8981\n    SmartNumber&lt;double&gt; num1(42);        \/\/ OK: \u660e\u793a\u7684\u306a\u69cb\u7bc9\n    \/\/ SmartNumber&lt;double&gt; num2 = 42;    \/\/ \u30a8\u30e9\u30fc: \u6697\u9ed9\u306e\u5909\u63db\u306f\u7981\u6b62\n\n    \/\/ \u540c\u3058\u578b\u30ab\u30c6\u30b4\u30ea\u9593\u3067\u306f\u6697\u9ed9\u306e\u5909\u63db\u3092\u8a31\u53ef\n    SmartNumber&lt;float&gt; f(3.14f);         \/\/ OK\n    SmartNumber&lt;double&gt; d = f;           \/\/ OK: \u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u9593\u306e\u5909\u63db\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6761\u4ef6\u4ed8\u304d<code>explicit<\/code>\u306e\u4e3b\u306a\u5229\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u578b\u30ab\u30c6\u30b4\u30ea\u306b\u57fa\u3065\u304f\u5909\u63db\u5236\u5fa1<\/li>\n\n\n\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30bf\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u306e\u7d71\u5408<\/li>\n\n\n\n<li>\u3088\u308a\u7d30\u304b\u306a\u578b\u5b89\u5168\u6027\u306e\u5b9f\u73fe<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u578b\u30c1\u30a7\u30c3\u30af\u306e\u5f37\u5316<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u65b0\u3057\u3044\u69cb\u6587\u3068\u4e92\u63db\u6027\u306e\u8003\u616e<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C++20\u3067\u306e\u65b0\u6a5f\u80fd\u3092\u6d3b\u7528\u3057\u306a\u304c\u3089\u3001\u4e0b\u4f4d\u4e92\u63db\u6027\u3092\u4fdd\u3064\u5b9f\u88c5\u4f8b\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=\"\">template&lt;typename T&gt;\nclass SafeContainer {\npublic:\n    \/\/ C++20\u306e\u6761\u4ef6\u4ed8\u304dexplicit\u3092\u4f7f\u7528\n#if __cplusplus &gt;= 202002L\n    template&lt;typename U&gt;\n    explicit(!std::is_same_v&lt;T, U&gt;) SafeContainer(const SafeContainer&lt;U&gt;&amp; other)\n        : data_(other.getData()) {}\n#else\n    \/\/ C++17\u4ee5\u524d\u3067\u306e\u4e92\u63db\u5b9f\u88c5\n    template&lt;typename U&gt;\n    explicit SafeContainer(const SafeContainer&lt;U&gt;&amp; other)\n        : data_(other.getData()) {}\n#endif\n\n    \/\/ \u5171\u901a\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\n    explicit SafeContainer(size_t size = 0) : data_(size) {}\n\n    const std::vector&lt;T&gt;&amp; getData() const { return data_; }\n\n    \/\/ C++20\u306e\u6761\u4ef6\u4ed8\u304dexplicit\u3092\u4f7f\u7528\u3057\u305f\u5909\u63db\u6f14\u7b97\u5b50\n#if __cplusplus &gt;= 202002L\n    template&lt;typename U&gt;\n    explicit(std::is_fundamental_v&lt;U&gt;) operator SafeContainer&lt;U&gt;() const {\n        SafeContainer&lt;U&gt; result(data_.size());\n        std::transform(data_.begin(), data_.end(),\n                      result.data_.begin(),\n                      [](const T&amp; val) { return static_cast&lt;U&gt;(val); });\n        return result;\n    }\n#endif\n\nprivate:\n    std::vector&lt;T&gt; data_;\n\n    \/\/ \u30d5\u30ec\u30f3\u30c9\u5ba3\u8a00\u3067\u30a2\u30af\u30bb\u30b9\u3092\u8a31\u53ef\n    template&lt;typename&gt; friend class SafeContainer;\n};\n\n\/\/ \u65b0\u6a5f\u80fd\u3092\u6d3b\u7528\u3057\u305f\u578b\u7279\u6027\u306e\u5b9a\u7fa9\n#if __cplusplus &gt;= 202002L\ntemplate&lt;typename T&gt;\nstruct is_safe_container : std::false_type {};\n\ntemplate&lt;typename T&gt;\nstruct is_safe_container&lt;SafeContainer&lt;T&gt;&gt; : std::true_type {};\n\ntemplate&lt;typename T&gt;\ninline constexpr bool is_safe_container_v = is_safe_container&lt;T&gt;::value;\n#endif\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid modern_example() {\n    SafeContainer&lt;int&gt; ints(5);\n\n#if __cplusplus &gt;= 202002L\n    \/\/ C++20\u3067\u306e\u9ad8\u5ea6\u306a\u578b\u5909\u63db\u5236\u5fa1\n    SafeContainer&lt;double&gt; doubles = ints;  \/\/ \u660e\u793a\u7684\u306a\u5909\u63db\u304c\u5fc5\u8981\n\n    static_assert(is_safe_container_v&lt;SafeContainer&lt;int&gt;&gt;);\n    static_assert(!is_safe_container_v&lt;std::vector&lt;int&gt;&gt;);\n#endif\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">C++20\u306e\u65b0\u6a5f\u80fd\u3092\u6d3b\u7528\u3059\u308b\u969b\u306e\u8003\u616e\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e0b\u4f4d\u4e92\u63db\u6027\u306e\u7dad\u6301<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d7\u30ea\u30d7\u30ed\u30bb\u30c3\u30b5\u30de\u30af\u30ed\u306b\u3088\u308b\u30d0\u30fc\u30b8\u30e7\u30f3\u5206\u5c90<\/li>\n\n\n\n<li>\u4e92\u63db\u6027\u306e\u3042\u308b\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u5b9f\u88c5\u306e\u63d0\u4f9b<\/li>\n\n\n\n<li>\u6a5f\u80fd\u691c\u51fa\u30de\u30af\u30ed\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u65b0\u3057\u3044\u578b\u7279\u6027\u306e\u6d3b\u7528<\/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=\"\">   \/\/ C++20\u306e\u578b\u7279\u6027\u3092\u4f7f\u7528\u3057\u305f\u5236\u7d04\n   template&lt;typename T&gt;\n   concept SafeConvertible = requires(T a) {\n       { SafeContainer&lt;double&gt;(a) } -&gt; std::same_as&lt;SafeContainer&lt;double&gt;&gt;;\n   };\n\n   template&lt;typename T&gt;\n   requires SafeConvertible&lt;T&gt;\n   void process(const T&amp; value) {\n       \/\/ \u51e6\u7406\u306e\u5b9f\u88c5\n   }<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30d1\u30a4\u30e9\u30b5\u30dd\u30fc\u30c8\u306e\u78ba\u8a8d<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5404\u30b3\u30f3\u30d1\u30a4\u30e9\u3067\u306e\u52d5\u4f5c\u78ba\u8a8d<\/li>\n\n\n\n<li>\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u30e1\u30ab\u30cb\u30ba\u30e0\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d1\u30a4\u30e9\u56fa\u6709\u306e\u6700\u9069\u5316\u306e\u8003\u616e<\/li>\n<\/ul>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u30b3\u30b9\u30c8<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u578b\u30c1\u30a7\u30c3\u30af\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9<\/li>\n\n\n\n<li>\u5b9f\u884c\u6642\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u7279\u6027<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u306b\u3088\u308a\u3001\u3088\u308a\u578b\u5b89\u5168\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u304c\u66f8\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u6a5f\u80fd\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30c7\u30d0\u30c3\u30b0\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-22\">\u5b9f\u8df5\u7684\u306a\u30c7\u30d0\u30c3\u30b0\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-23\">\u30b3\u30f3\u30d1\u30a4\u30e9\u30a8\u30e9\u30fc\u306e\u89e3\u8aad\u3068\u5bfe\u51e6\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>explicit<\/code>\u306b\u95a2\u9023\u3059\u308b\u4e00\u822c\u7684\u306a\u30b3\u30f3\u30d1\u30a4\u30e9\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\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=\"\">class StringWrapper {\npublic:\n    explicit StringWrapper(const std::string&amp; str) : data_(str) {}\n    explicit StringWrapper(size_t size) : data_(size, ' ') {}\n\n    \/\/ \u6587\u5b57\u5217\u5909\u63db\u6f14\u7b97\u5b50\n    explicit operator std::string() const { return data_; }\n\nprivate:\n    std::string data_;\n};\n\n\/\/ \u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3084\u3059\u3044\u30b3\u30fc\u30c9\u4f8b\u3068\u4fee\u6b63\u65b9\u6cd5\nvoid demonstration() {\n    \/\/ \u30a8\u30e9\u30fc1: \u6697\u9ed9\u306e\u5909\u63db\u304c\u7981\u6b62\u3055\u308c\u3066\u3044\u308b\n    \/\/ StringWrapper str1 = \"Hello\";  \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\n    StringWrapper str1(\"Hello\");      \/\/ \u4fee\u6b63: \u660e\u793a\u7684\u306a\u69cb\u7bc9\n\n    \/\/ \u30a8\u30e9\u30fc2: explicit\u5909\u63db\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\n    \/\/ std::string s1 = str1;         \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\n    std::string s1 = static_cast&lt;std::string&gt;(str1);  \/\/ \u4fee\u6b63: \u660e\u793a\u7684\u306a\u5909\u63db\n\n    \/\/ \u30a8\u30e9\u30fc3: \u95a2\u6570\u547c\u3073\u51fa\u3057\u3067\u306e\u6697\u9ed9\u306e\u5909\u63db\n    void processString(StringWrapper sw);\n    \/\/ processString(\"World\");        \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\n    processString(StringWrapper(\"World\"));  \/\/ \u4fee\u6b63: \u660e\u793a\u7684\u306a\u5909\u63db\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u822c\u7684\u306a\u30b3\u30f3\u30d1\u30a4\u30e9\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3068\u305d\u306e\u89e3\u6c7a\u7b56\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u201cno suitable constructor exists to convert from X to Y\u201d<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u539f\u56e0: explicit\u69cb\u7bc9\u5b50\u306b\u3088\u308b\u6697\u9ed9\u306e\u5909\u63db\u306e\u7981\u6b62<\/li>\n\n\n\n<li>\u89e3\u6c7a: \u660e\u793a\u7684\u306a\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u547c\u3073\u51fa\u3057\u3092\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u201ccannot convert from X to Y\u201d<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u539f\u56e0: explicit\u5909\u63db\u6f14\u7b97\u5b50\u306b\u3088\u308b\u5909\u63db\u306e\u5236\u9650<\/li>\n\n\n\n<li>\u89e3\u6c7a: static_cast\u307e\u305f\u306f\u660e\u793a\u7684\u306a\u5909\u63db\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u201cno matching function for call to\u2026\u201d<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u539f\u56e0: \u95a2\u6570\u30d1\u30e9\u30e1\u30fc\u30bf\u3078\u306e\u6697\u9ed9\u306e\u5909\u63db\u304c\u7981\u6b62<\/li>\n\n\n\n<li>\u89e3\u6c7a: \u9069\u5207\u306a\u578b\u306b\u660e\u793a\u7684\u306b\u5909\u63db\u3057\u3066\u304b\u3089\u6e21\u3059<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">\u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30e9\u30fc\u306e\u4e88\u9632\u3068\u5bfe\u7b56<\/h3>\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;\nclass SafeConverter {\npublic:\n    explicit SafeConverter(T value) : value_(value) {\n        validate();\n    }\n\n    \/\/ \u578b\u5909\u63db\u6642\u306e\u691c\u8a3c\u3092\u884c\u3046\n    template&lt;typename U&gt;\n    explicit operator U() const {\n        try {\n            \/\/ \u5909\u63db\u524d\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\n            checkRange&lt;U&gt;();\n            return static_cast&lt;U&gt;(value_);\n        } catch (const std::exception&amp; e) {\n            \/\/ \u30a8\u30e9\u30fc\u30ed\u30b0\u306e\u8a18\u9332\n            std::cerr &lt;&lt; \"Conversion error: \" &lt;&lt; e.what() &lt;&lt; std::endl;\n            throw;\n        }\n    }\n\nprivate:\n    T value_;\n\n    void validate() {\n        if constexpr (std::is_arithmetic_v&lt;T&gt;) {\n            if (std::isnan(static_cast&lt;double&gt;(value_))) {\n                throw std::invalid_argument(\"Value cannot be NaN\");\n            }\n        }\n    }\n\n    template&lt;typename U&gt;\n    void checkRange() const {\n        if constexpr (std::is_arithmetic_v&lt;T&gt; &amp;&amp; std::is_arithmetic_v&lt;U&gt;) {\n            if constexpr (std::is_integral_v&lt;U&gt;) {\n                if (value_ &gt; static_cast&lt;T&gt;(std::numeric_limits&lt;U&gt;::max()) ||\n                    value_ &lt; static_cast&lt;T&gt;(std::numeric_limits&lt;U&gt;::min())) {\n                    throw std::out_of_range(\"Value outside target type range\");\n                }\n            }\n        }\n    }\n};\n\n\/\/ \u30c7\u30d0\u30c3\u30b0\u652f\u63f4\u95a2\u6570\ntemplate&lt;typename T&gt;\nclass DebugWrapper {\npublic:\n    explicit DebugWrapper(T value) : value_(value) {\n        debugLog(\"Constructor called\");\n    }\n\n    template&lt;typename U&gt;\n    explicit operator U() const {\n        debugLog(\"Converting to different type\");\n        return SafeConverter&lt;T&gt;(value_).operator U();\n    }\n\n    ~DebugWrapper() {\n        debugLog(\"Destructor called\");\n    }\n\nprivate:\n    T value_;\n\n    void debugLog(const char* message) const {\n        #ifdef _DEBUG\n        std::cout &lt;&lt; \"[DebugWrapper] \" &lt;&lt; message\n                  &lt;&lt; \" (value: \" &lt;&lt; value_ &lt;&lt; \")\" &lt;&lt; std::endl;\n        #endif\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\u3068\u30a8\u30e9\u30fc\u51e6\u7406\nvoid debugExample() {\n    try {\n        \/\/ \u6b63\u5e38\u306a\u30b1\u30fc\u30b9\n        DebugWrapper&lt;double&gt; d1(42.0);\n        auto i1 = static_cast&lt;int&gt;(d1);\n\n        \/\/ \u30a8\u30e9\u30fc\u30b1\u30fc\u30b9: \u7bc4\u56f2\u5916\u306e\u5024\n        DebugWrapper&lt;double&gt; d2(1e300);\n        \/\/ \u6b21\u306e\u884c\u306f\u4f8b\u5916\u3092\u30b9\u30ed\u30fc\n        \/\/ auto i2 = static_cast&lt;int&gt;(d2);\n\n    } catch (const std::exception&amp; e) {\n        std::cerr &lt;&lt; \"Error caught: \" &lt;&lt; e.what() &lt;&lt; std::endl;\n    }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30e9\u30fc\u306e\u4e88\u9632\u3068\u5bfe\u7b56\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5165\u529b\u5024\u306e\u691c\u8a3c<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af<\/li>\n\n\n\n<li>\u578b\u306e\u4e92\u63db\u6027\u78ba\u8a8d<\/li>\n\n\n\n<li>\u7279\u6b8a\u5024\uff08NaN\u3001\u7121\u9650\u5927\u306a\u3069\uff09\u306e\u51e6\u7406<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a8\u30e9\u30fc\u51e6\u7406\u30e1\u30ab\u30cb\u30ba\u30e0<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u4f8b\u5916\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u30ed\u30b0\u306e\u8a18\u9332<\/li>\n\n\n\n<li>\u30c7\u30d0\u30c3\u30b0\u60c5\u5831\u306e\u63d0\u4f9b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30d0\u30c3\u30b0\u652f\u63f4\u6a5f\u80fd<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ed\u30b0\u51fa\u529b<\/li>\n\n\n\n<li>\u72b6\u614b\u8ffd\u8de1<\/li>\n\n\n\n<li>\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c6\u30b9\u30c8\u6226\u7565<\/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=\"\">   \/\/ \u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u4f8b\n   void runTests() {\n       \/\/ \u6b63\u5e38\u7cfb\u30c6\u30b9\u30c8\n       assert(static_cast&lt;int&gt;(SafeConverter&lt;double&gt;(42.0)) == 42);\n\n       \/\/ \u7570\u5e38\u7cfb\u30c6\u30b9\u30c8\n       bool exceptionCaught = false;\n       try {\n           auto val = static_cast&lt;int&gt;(SafeConverter&lt;double&gt;(1e300));\n       } catch (const std::out_of_range&amp;) {\n           exceptionCaught = true;\n       }\n       assert(exceptionCaught);\n   }<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30c7\u30d0\u30c3\u30b0\u3068\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u6280\u8853\u3092\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001<code>explicit<\/code>\u3092\u4f7f\u7528\u3057\u305f\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u3068\u4fe1\u983c\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; 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