{"id":2038,"date":"2025-03-24T08:48:29","date_gmt":"2025-03-23T23:48:29","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=2038"},"modified":"2025-03-24T08:48:54","modified_gmt":"2025-03-23T23:48:54","slug":"%e3%80%90%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%e3%80%91c-memcpy%e3%81%ae%e5%8d%b1%e9%99%ba%e6%80%a7%e3%81%a8%e6%9c%80%e6%96%b0%e3%81%ae%e5%ae%89%e5%85%a8%e3%81%aa%e4%bd%bf%e3%81%84%e6%96%b92","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=2038","title":{"rendered":"\u3010\u5b8c\u5168\u30ac\u30a4\u30c9\u3011C++ memcpy\u306e\u5371\u967a\u6027\u3068\u6700\u65b0\u306e\u5b89\u5168\u306a\u4f7f\u3044\u65b92024"},"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\">\u30e1\u30e2\u30ea\u30b3\u30d4\u30fc\u306e\u57fa\u790e\u77e5\u8b58\u3068memcpy\u306e\u5f79\u5272<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">C++\u3067\u306e\u30e1\u30e2\u30ea\u64cd\u4f5c\u306e\u91cd\u8981\u6027\u3068\u57fa\u672c\u6982\u5ff5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">memcpy\u304c\u5fc5\u8981\u3068\u3055\u308c\u308b\u7279\u5b9a\u306e\u5834\u9762\u3068\u7528\u9014<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">memcpy\u306e\u6b63\u3057\u3044\u4f7f\u3044\u65b9\u3068\u6ce8\u610f\u70b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">memcpy\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u3068\u5f15\u6570\u306e\u8aac\u660e<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u9632\u3050\u305f\u3081\u306e\u91cd\u8981\u306a\u78ba\u8a8d\u4e8b\u9805<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u9055\u53cd\u306b\u3088\u308b\u672a\u5b9a\u7fa9\u52d5\u4f5c\u306e\u56de\u907f\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">memcpy\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">\u30e1\u30e2\u30ea\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u306e\u6700\u9069\u5316<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u8ee2\u9001\u6642\u306e\u6700\u9069\u5316\u6226\u7565<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">\u73fe\u4ee3\u306eC++\u3067\u63a8\u5968\u3055\u308c\u308b\u30e1\u30e2\u30ea\u30b3\u30d4\u30fc\u624b\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">std::copy\u3068std::move_iterator\u306e\u6d3b\u7528<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-16\">\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u3063\u305f\u5b89\u5168\u306a\u30e1\u30e2\u30ea\u7ba1\u7406<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-19\">memcpy\u306e\u4ee3\u66ff\u624b\u6bb5\u3068\u4f7f\u3044\u5206\u3051<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-20\">memmove\u3068\u306e\u9055\u3044\u3068\u9069\u5207\u306a\u4f7f\u7528\u30b7\u30fc\u30f3<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-22\">C++17\u4ee5\u964d\u3067\u5c0e\u5165\u3055\u308c\u305f\u65b0\u3057\u3044\u30e1\u30e2\u30ea\u64cd\u4f5c\u6a5f\u80fd<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-26\">\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3068\u4e00\u822c\u7684\u306a\u30d0\u30b0\u306e\u9632\u6b62\u7b56<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-27\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u305f\u3081\u306eRAII\u30d1\u30bf\u30fc\u30f3\u306e\u9069\u7528<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-30\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u3067\u306e\u30e1\u30e2\u30ea\u64cd\u4f5c\u306e\u691c\u8a3c\u65b9\u6cd5<\/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\">\u30e1\u30e2\u30ea\u30b3\u30d4\u30fc\u306e\u57fa\u790e\u77e5\u8b58\u3068memcpy\u306e\u5f79\u5272<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">C++\u3067\u306e\u30e1\u30e2\u30ea\u64cd\u4f5c\u306e\u91cd\u8981\u6027\u3068\u57fa\u672c\u6982\u5ff5<\/h3>\n\n\n\n<p>C++\u306b\u304a\u3051\u308b\u30e1\u30e2\u30ea\u64cd\u4f5c\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u4fe1\u983c\u6027\u306b\u76f4\u63a5\u7684\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u7279\u306b\u4f4e\u30ec\u30d9\u30eb\u306e\u30b7\u30b9\u30c6\u30e0\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3084\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u64cd\u4f5c\u304c\u4e0d\u53ef\u6b20\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30e1\u30e2\u30ea\u64cd\u4f5c\u306e\u57fa\u672c\u6982\u5ff5\u3092\u7406\u89e3\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u30ec\u30a4\u30a2\u30a6\u30c8<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b9\u30bf\u30c3\u30af\u30e1\u30e2\u30ea\uff1a\u81ea\u52d5\u7684\u306b\u7ba1\u7406\u3055\u308c\u308b\u4e00\u6642\u7684\u306a\u30e1\u30e2\u30ea\u9818\u57df<\/li>\n\n\n\n<li>\u30d2\u30fc\u30d7\u30e1\u30e2\u30ea\uff1a\u52d5\u7684\u306b\u78ba\u4fdd\u30fb\u89e3\u653e\u304c\u5fc5\u8981\u306a\u6c38\u7d9a\u7684\u306a\u30e1\u30e2\u30ea\u9818\u57df<\/li>\n\n\n\n<li>\u9759\u7684\u30e1\u30e2\u30ea\uff1a\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u4f53\u3067\u5171\u6709\u3055\u308c\u308b\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u7528\u306e\u9818\u57df<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5404\u30d0\u30a4\u30c8\u306b\u306f\u4e00\u610f\u306e\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b<\/li>\n\n\n\n<li>\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u7528\u3057\u3066\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u3092\u53c2\u7167\u30fb\u64cd\u4f5c<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u578b\u3068\u30e1\u30e2\u30ea\u30b5\u30a4\u30ba<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5404\u30c7\u30fc\u30bf\u578b\u306f\u56fa\u6709\u306e\u30e1\u30e2\u30ea\u30b5\u30a4\u30ba\u3092\u6301\u3064\uff08\u4f8b\uff1aint \u306f\u901a\u5e384\u30d0\u30a4\u30c8\uff09<\/li>\n\n\n\n<li>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u8981\u4ef6\u306b\u3088\u308a\u3001\u5b9f\u969b\u306e\u30e1\u30e2\u30ea\u914d\u7f6e\u306b\u5236\u7d04\u304c\u3042\u308b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">memcpy\u304c\u5fc5\u8981\u3068\u3055\u308c\u308b\u7279\u5b9a\u306e\u5834\u9762\u3068\u7528\u9014<\/h3>\n\n\n\n<p>memcpy\u95a2\u6570\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5b9a\u306e\u30b7\u30fc\u30f3\u3067\u7279\u306b\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u306e\u9ad8\u901f\u30b3\u30d4\u30fc<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30c7\u30d0\u30a4\u30b9\u30c9\u30e9\u30a4\u30d0\u3067\u306e\u30d0\u30c3\u30d5\u30a1\u30b3\u30d4\u30fc\nchar buffer1[1024];\nchar buffer2[1024];\n\/\/ \u30d0\u30c3\u30d5\u30a1\u5168\u4f53\u3092\u9ad8\u901f\u306b\u30b3\u30d4\u30fc\nmemcpy(buffer2, buffer1, sizeof(buffer1));<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">struct Data {\n    int id;\n    float value;\n};\n\n\/\/ \u69cb\u9020\u4f53\u3092\u30d0\u30a4\u30c8\u914d\u5217\u306b\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\nData data = {1, 3.14f};\nchar serialized[sizeof(Data)];\nmemcpy(serialized, &amp;data, sizeof(Data));<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u914d\u5217\u64cd\u4f5c<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5927\u898f\u6a21\u306a\u914d\u5217\u306e\u9ad8\u901f\u30b3\u30d4\u30fc\nint source[10000];\nint destination[10000];\nmemcpy(destination, source, sizeof(int) * 10000);<\/pre>\n\n\n\n<p>memcpy\u306e\u4e3b\u306a\u7279\u5fb4\u3068\u5229\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u9ad8\u901f\u6027<\/strong>: \u6700\u9069\u5316\u3055\u308c\u305f\u4f4e\u30ec\u30d9\u30eb\u306e\u30e1\u30e2\u30ea\u30b3\u30d4\u30fc\u64cd\u4f5c<\/li>\n\n\n\n<li><strong>\u5358\u7d14\u6027<\/strong>: \u30b7\u30f3\u30d7\u30eb\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u4f7f\u3044\u3084\u3059\u3044<\/li>\n\n\n\n<li><strong>\u6c4e\u7528\u6027<\/strong>: \u3042\u3089\u3086\u308b\u578b\u306e\u30c7\u30fc\u30bf\u3092\u30d0\u30a4\u30c8\u5358\u4f4d\u3067\u30b3\u30d4\u30fc\u53ef\u80fd<\/li>\n<\/ul>\n\n\n\n<p>\u3057\u304b\u3057\u3001\u4ee5\u4e0b\u306e\u70b9\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30aa\u30fc\u30d0\u30fc\u30e9\u30c3\u30d7\u3059\u308b\u30e1\u30e2\u30ea\u9818\u57df\u9593\u306e\u30b3\u30d4\u30fc\u306b\u306f\u4f7f\u7528\u3067\u304d\u306a\u3044<\/li>\n\n\n\n<li>\u578b\u5b89\u5168\u6027\u304c\u306a\u3044\uff08\u30d0\u30a4\u30c8\u5358\u4f4d\u306e\u30b3\u30d4\u30fc\u306e\u305f\u3081\uff09<\/li>\n\n\n\n<li>\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u30ea\u30b9\u30af\u304c\u3042\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u9069\u5207\u306a\u4f7f\u7528\u30b7\u30fc\u30f3\uff1a<\/p>\n\n\n<div id=\"id-84d1d5d9-0363-40ba-a322-40ed101af28e\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30b7\u30fc\u30f3<\/th><th>\u9069\u5207\u6027<\/th><th>\u7406\u7531<\/th><\/tr><\/thead><tbody><tr><td>\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u306e\u64cd\u4f5c<\/td><td>\u25ce<\/td><td>\u578b\u3092\u8003\u616e\u305b\u305a\u52b9\u7387\u7684\u306b\u30b3\u30d4\u30fc\u53ef\u80fd<\/td><\/tr><tr><td>\u69cb\u9020\u4f53\u306e\u30b3\u30d4\u30fc<\/td><td>\u25cb<\/td><td>POD\u578b\u306e\u5834\u5408\u306f\u9ad8\u901f\u306b\u30b3\u30d4\u30fc\u53ef\u80fd<\/td><\/tr><tr><td>\u6587\u5b57\u5217\u64cd\u4f5c<\/td><td>\u25b3<\/td><td>NULL\u7d42\u7aef\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u3042\u308a<\/td><\/tr><tr><td>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30d4\u30fc<\/td><td>\u00d7<\/td><td>\u30c7\u30b9\u30c8\u30e9\u30af\u30bf\u3084\u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb\u304c\u7834\u58ca\u3055\u308c\u308b\u53ef\u80fd\u6027<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u57fa\u790e\u77e5\u8b58\u3092\u8e0f\u307e\u3048\u305f\u4e0a\u3067\u3001memcpy\u306e\u5b89\u5168\u306a\u4f7f\u7528\u65b9\u6cd5\u3068\u6ce8\u610f\u70b9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">memcpy\u306e\u6b63\u3057\u3044\u4f7f\u3044\u65b9\u3068\u6ce8\u610f\u70b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">memcpy\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u3068\u5f15\u6570\u306e\u8aac\u660e<\/h3>\n\n\n\n<p>memcpy\u95a2\u6570\u306e\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* memcpy(void* destination, const void* source, size_t size);<\/pre>\n\n\n\n<p>\u5404\u5f15\u6570\u306e\u8a73\u7d30\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>destination<\/strong>: \u30b3\u30d4\u30fc\u5148\u306e\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>void*\u578b\u3067\u4efb\u610f\u306e\u578b\u306e\u30dd\u30a4\u30f3\u30bf\u3092\u53d7\u3051\u4ed8\u3051<\/li>\n\n\n\n<li>\u5341\u5206\u306a\u30b5\u30a4\u30ba\u304c\u78ba\u4fdd\u3055\u308c\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>source<\/strong>: \u30b3\u30d4\u30fc\u5143\u306e\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>const void*\u578b\u3067\u8aad\u307f\u53d6\u308a\u5c02\u7528<\/li>\n\n\n\n<li>NULL\u30dd\u30a4\u30f3\u30bf\u306f\u4e0d\u53ef<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>size<\/strong>: \u30b3\u30d4\u30fc\u3059\u308b\u30d0\u30a4\u30c8\u6570<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>size_t\u578b\uff08\u901a\u5e38\u306funsigned long\uff09<\/li>\n\n\n\n<li>0\u3082\u6709\u52b9\u306a\u5024\u3068\u3057\u3066\u6271\u308f\u308c\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u57fa\u672c\u7684\u306a\u4f7f\u7528\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=\"\">\/\/ \u57fa\u672c\u7684\u306a\u914d\u5217\u306e\u30b3\u30d4\u30fc\nint src[] = {1, 2, 3, 4, 5};\nint dest[5];\nmemcpy(dest, src, sizeof(src));  \/\/ \u914d\u5217\u5168\u4f53\u3092\u30b3\u30d4\u30fc\n\n\/\/ \u69cb\u9020\u4f53\u306e\u30b3\u30d4\u30fc\nstruct Point {\n    double x;\n    double y;\n};\nPoint p1 = {1.0, 2.0};\nPoint p2;\nmemcpy(&amp;p2, &amp;p1, sizeof(Point));<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u9632\u3050\u305f\u3081\u306e\u91cd\u8981\u306a\u78ba\u8a8d\u4e8b\u9805<\/h3>\n\n\n\n<p>\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306f\u6df1\u523b\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8106\u5f31\u6027\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u5bfe\u7b56\u3092\u5fc5\u305a\u5b9f\u65bd\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b5\u30a4\u30ba\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5b89\u5168\u306a\u30b3\u30d4\u30fc\u5b9f\u88c5\u306e\u4f8b\nbool safe_memcpy(void* dest, const void* src, size_t dest_size, size_t src_size) {\n    if (!dest || !src) return false;  \/\/ NULL \u30c1\u30a7\u30c3\u30af\n    if (dest_size &lt; src_size) return false;  \/\/ \u30b5\u30a4\u30ba\u30c1\u30a7\u30c3\u30af\n\n    memcpy(dest, src, src_size);\n    return true;\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nchar buffer[100];\nchar data[] = \"Hello, World!\";\nif (!safe_memcpy(buffer, data, sizeof(buffer), sizeof(data))) {\n    \/\/ \u30a8\u30e9\u30fc\u51e6\u7406\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u5883\u754c\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u914d\u5217\u5883\u754c\u306e\u30c1\u30a7\u30c3\u30af\ntemplate&lt;typename T, size_t N&gt;\nbool copy_array(T (&amp;dest)[N], const T* src, size_t src_count) {\n    if (src_count &gt; N) return false;  \/\/ \u5883\u754c\u30c1\u30a7\u30c3\u30af\n    memcpy(dest, src, src_count * sizeof(T));\n    return true;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u9055\u53cd\u306b\u3088\u308b\u672a\u5b9a\u7fa9\u52d5\u4f5c\u306e\u56de\u907f\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306e\u9055\u53cd\u306f\u672a\u5b9a\u7fa9\u52d5\u4f5c\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><strong>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306e\u78ba\u8a8d<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u8003\u616e\u3057\u305f\u30b3\u30d4\u30fc\ntemplate&lt;typename T&gt;\nbool aligned_copy(T* dest, const T* src) {\n    \/\/ \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u8981\u4ef6\u306e\u30c1\u30a7\u30c3\u30af\n    static_assert(std::is_trivially_copyable&lt;T&gt;::value, \n                 \"Type must be trivially copyable\");\n\n    if (reinterpret_cast&lt;std::uintptr_t&gt;(dest) % alignof(T) != 0 ||\n        reinterpret_cast&lt;std::uintptr_t&gt;(src) % alignof(T) != 0) {\n        return false;  \/\/ \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u9055\u53cd\n    }\n\n    memcpy(dest, src, sizeof(T));\n    return true;\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u69cb\u9020\u4f53\u306e\u30d1\u30c7\u30a3\u30f3\u30b0<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u6307\u5b9a\u4ed8\u304d\u69cb\u9020\u4f53\nstruct alignas(8) AlignedStruct {\n    int32_t a;    \/\/ 4\u30d0\u30a4\u30c8\n    int32_t b;    \/\/ 4\u30d0\u30a4\u30c8\n    double c;     \/\/ 8\u30d0\u30a4\u30c8\n};\n\n\/\/ \u5b89\u5168\u306a\u30b3\u30d4\u30fc\nAlignedStruct s1 = {1, 2, 3.14};\nAlignedStruct s2;\nmemcpy(&amp;s2, &amp;s1, sizeof(AlignedStruct));<\/pre>\n\n\n\n<p>\u91cd\u8981\u306a\u6ce8\u610f\u70b9\u307e\u3068\u3081\uff1a<\/p>\n\n\n<div id=\"id-33001a66-830a-47dd-a47b-46f8ed1ff165\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6ce8\u610f\u70b9<\/th><th>\u5bfe\u7b56<\/th><th>\u78ba\u8a8d\u65b9\u6cd5<\/th><\/tr><\/thead><tbody><tr><td>\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba<\/td><td>\u30b5\u30a4\u30ba\u30c1\u30a7\u30c3\u30af\u95a2\u6570\u306e\u5b9f\u88c5<\/td><td>sizeof\u6f14\u7b97\u5b50\u306b\u3088\u308b\u78ba\u8a8d<\/td><\/tr><tr><td>\u30dd\u30a4\u30f3\u30bf\u306e\u6709\u52b9\u6027<\/td><td>NULL\u30c1\u30a7\u30c3\u30af<\/td><td>\u30a2\u30c9\u30ec\u30b9\u6709\u52b9\u6027\u306e\u691c\u8a3c<\/td><\/tr><tr><td>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8<\/td><td>alignas\u6307\u5b9a\u3001\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u30c1\u30a7\u30c3\u30af<\/td><td>std::align_of\u306b\u3088\u308b\u78ba\u8a8d<\/td><\/tr><tr><td>\u578b\u306e\u4e92\u63db\u6027<\/td><td>is_trivially_copyable\u30c1\u30a7\u30c3\u30af<\/td><td>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a2\u30b5\u30fc\u30c8<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u6ce8\u610f\u70b9\u3092\u5b88\u308b\u3053\u3068\u3067\u3001memcpy\u3092\u5b89\u5168\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30c6\u30af\u30cb\u30c3\u30af\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">memcpy\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u30e1\u30e2\u30ea\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u306e\u6700\u9069\u5316<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u64cd\u4f5c\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u9650\u306b\u5f15\u304d\u51fa\u3059\u305f\u3081\u306b\u306f\u3001\u30e1\u30e2\u30ea\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u3092\u610f\u8b58\u3057\u305f\u5b9f\u88c5\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-9\">1. \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u6700\u9069\u5316<\/h4>\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;memory&gt;\n\n\/\/ \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u6307\u5b9a\u4ed8\u304d\u30e1\u30e2\u30ea\u78ba\u4fdd\nvoid* aligned_malloc(size_t size, size_t alignment) {\n    void* ptr = nullptr;\n    if (posix_memalign(&amp;ptr, alignment, size) != 0) {\n        return nullptr;\n    }\n    return ptr;\n}\n\n\/\/ \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u6700\u9069\u5316\u3055\u308c\u305f\u914d\u5217\u30af\u30e9\u30b9\ntemplate&lt;typename T, size_t Alignment = alignof(T)&gt;\nclass AlignedArray {\n    std::unique_ptr&lt;T[], std::function&lt;void(T*)&gt;&gt; data;\n    size_t size_;\n\npublic:\n    explicit AlignedArray(size_t n) : size_(n) {\n        T* ptr = static_cast&lt;T*&gt;(aligned_malloc(n * sizeof(T), Alignment));\n        data = std::unique_ptr&lt;T[], std::function&lt;void(T*)&gt;&gt;(\n            ptr, [](T* p) { free(p); }\n        );\n    }\n\n    T* get() { return data.get(); }\n    const T* get() const { return data.get(); }\n    size_t size() const { return size_; }\n};<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-10\">2. \u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u8003\u616e<\/h4>\n\n\n\n<p>\u4e00\u822c\u7684\u306aCPU\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u30b5\u30a4\u30ba\u306f64\u30d0\u30a4\u30c8\u3067\u3059\u3002\u3053\u308c\u3092\u8003\u616e\u3057\u305f\u30e1\u30e2\u30ea\u64cd\u4f5c\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5411\u4e0a\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=\"\">\/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u5883\u754c\u3067\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\nconstexpr size_t CACHE_LINE_SIZE = 64;\n\nstruct alignas(CACHE_LINE_SIZE) CacheAlignedStruct {\n    std::array&lt;char, CACHE_LINE_SIZE&gt; data;\n};\n\n\/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u306a\u30b3\u30d4\u30fc\u95a2\u6570\ntemplate&lt;typename T&gt;\nvoid cache_friendly_copy(T* dest, const T* src, size_t count) {\n    \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u5883\u754c\u3067\u306e\u30b3\u30d4\u30fc\n    const size_t elements_per_cacheline = CACHE_LINE_SIZE \/ sizeof(T);\n\n    \/\/ \u30e1\u30a4\u30f3\u30eb\u30fc\u30d7\uff08\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u5358\u4f4d\u3067\u30b3\u30d4\u30fc\uff09\n    for (size_t i = 0; i &lt; count \/ elements_per_cacheline; ++i) {\n        memcpy(\n            dest + i * elements_per_cacheline,\n            src + i * elements_per_cacheline,\n            CACHE_LINE_SIZE\n        );\n    }\n\n    \/\/ \u6b8b\u308a\u306e\u8981\u7d20\u3092\u30b3\u30d4\u30fc\n    const size_t remaining = count % elements_per_cacheline;\n    if (remaining &gt; 0) {\n        memcpy(\n            dest + (count - remaining),\n            src + (count - remaining),\n            remaining * sizeof(T)\n        );\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u8ee2\u9001\u6642\u306e\u6700\u9069\u5316\u6226\u7565<\/h3>\n\n\n\n<p>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u8ee2\u9001\u6642\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u6226\u7565\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u6700\u9069\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e26\u5217\u51e6\u7406\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;thread&gt;\n#include &lt;vector&gt;\n\n\/\/ \u4e26\u5217memcpy\u5b9f\u88c5\nvoid parallel_memcpy(void* dest, const void* src, size_t size) {\n    const size_t thread_count = std::thread::hardware_concurrency();\n    const size_t chunk_size = (size + thread_count - 1) \/ thread_count;\n\n    std::vector&lt;std::thread&gt; threads;\n\n    for (size_t i = 0; i &lt; thread_count; ++i) {\n        const size_t offset = i * chunk_size;\n        const size_t current_chunk = std::min(chunk_size, size - offset);\n\n        if (current_chunk &gt; 0) {\n            threads.emplace_back([=]() {\n                memcpy(\n                    static_cast&lt;char*&gt;(dest) + offset,\n                    static_cast&lt;const char*&gt;(src) + offset,\n                    current_chunk\n                );\n            });\n        }\n    }\n\n    for (auto&amp; thread : threads) {\n        thread.join();\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>SIMD\u547d\u4ee4\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;immintrin.h&gt;\n\n\/\/ SSE\/AVX\u4f7f\u7528\u306e\u30e1\u30e2\u30ea\u30b3\u30d4\u30fc\uff08Intel\u30d7\u30ed\u30bb\u30c3\u30b5\u5411\u3051\uff09\nvoid simd_memcpy(void* dest, const void* src, size_t size) {\n    auto* d = static_cast&lt;__m256i*&gt;(dest);\n    const auto* s = static_cast&lt;const __m256i*&gt;(src);\n\n    \/\/ 32\u30d0\u30a4\u30c8\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3055\u308c\u305f\u90e8\u5206\u3092AVX\u547d\u4ee4\u3067\u30b3\u30d4\u30fc\n    for (size_t i = 0; i &lt; size \/ 32; ++i) {\n        _mm256_store_si256(d + i, _mm256_load_si256(s + i));\n    }\n\n    \/\/ \u6b8b\u308a\u306e\u90e8\u5206\u3092\u901a\u5e38\u306ememcpy\u3067\u30b3\u30d4\u30fc\n    const size_t remaining = size % 32;\n    if (remaining &gt; 0) {\n        memcpy(\n            static_cast&lt;char*&gt;(dest) + (size - remaining),\n            static_cast&lt;const char*&gt;(src) + (size - remaining),\n            remaining\n        );\n    }\n}<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u52b9\u679c\u6bd4\u8f03\uff1a<\/p>\n\n\n<div id=\"id-816e7fe2-a854-42d8-ac58-2625e410df42\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6700\u9069\u5316\u624b\u6cd5<\/th><th>\u9069\u7528\u30b7\u30fc\u30f3<\/th><th>\u671f\u5f85\u3055\u308c\u308b\u52b9\u679c<\/th><\/tr><\/thead><tbody><tr><td>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u6700\u9069\u5316<\/td><td>\u3059\u3079\u3066\u306e\u30b1\u30fc\u30b9<\/td><td>10-30%\u5411\u4e0a<\/td><\/tr><tr><td>\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u8003\u616e<\/td><td>\u5927\u898f\u6a21\u30c7\u30fc\u30bf<\/td><td>20-50%\u5411\u4e0a<\/td><\/tr><tr><td>\u4e26\u5217\u51e6\u7406<\/td><td>\u5de8\u5927\u30c7\u30fc\u30bf\u8ee2\u9001<\/td><td>2-8\u500d\u9ad8\u901f\u5316<\/td><\/tr><tr><td>SIMD\u547d\u4ee4<\/td><td>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u6e08\u307f\u30c7\u30fc\u30bf<\/td><td>2-4\u500d\u9ad8\u901f\u5316<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u6700\u9069\u5316\u5b9f\u88c5\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u306b\u3088\u308b\u52b9\u679c\u691c\u8a3c<\/li>\n\n\n\n<li>\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u7279\u6027\u306e\u8003\u616e<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u305f\u9069\u5207\u306a\u6226\u7565\u9078\u629e<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u5b9f\u88c5<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001memcpy\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">\u73fe\u4ee3\u306eC++\u3067\u63a8\u5968\u3055\u308c\u308b\u30e1\u30e2\u30ea\u30b3\u30d4\u30fc\u624b\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">std::copy\u3068std::move_iterator\u306e\u6d3b\u7528<\/h3>\n\n\n\n<p>\u73fe\u4ee3\u306eC++\u3067\u306f\u3001\u578b\u5b89\u5168\u6027\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u4e21\u7acb\u3057\u305f\u9ad8\u6c34\u6e96\u306e\u30e1\u30e2\u30ea\u64cd\u4f5c\u6a5f\u80fd\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-14\">1. std::copy\u306e\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/h4>\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;algorithm&gt;\n#include &lt;vector&gt;\n#include &lt;array&gt;\n\n\/\/ \u57fa\u672c\u7684\u306a\u914d\u5217\u306e\u30b3\u30d4\u30fc\nvoid basic_copy_example() {\n    std::array&lt;int, 5&gt; source = {1, 2, 3, 4, 5};\n    std::array&lt;int, 5&gt; dest;\n\n    \/\/ \u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u305f\u5b89\u5168\u306a\u30b3\u30d4\u30fc\n    std::copy(source.begin(), source.end(), dest.begin());\n\n    \/\/ \u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\u4ed8\u304d\u306e\u30b3\u30d4\u30fc\n    std::copy_n(source.begin(), source.size(), dest.begin());\n}\n\n\/\/ \u6761\u4ef6\u4ed8\u304d\u30b3\u30d4\u30fc\nvoid conditional_copy_example() {\n    std::vector&lt;int&gt; source = {1, -2, 3, -4, 5};\n    std::vector&lt;int&gt; dest;\n\n    \/\/ \u6b63\u306e\u6570\u306e\u307f\u3092\u30b3\u30d4\u30fc\n    std::copy_if(source.begin(), source.end(), \n                 std::back_inserter(dest),\n                 [](int x) { return x &gt; 0; });\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-15\">2. std::move_iterator\u306b\u3088\u308b\u52b9\u7387\u7684\u306a\u8ee2\u9001<\/h4>\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;memory&gt;\n#include &lt;string&gt;\n\n\/\/ \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u52b9\u7387\u7684\u306a\u79fb\u52d5\nclass LargeObject {\n    std::string data;\npublic:\n    explicit LargeObject(const std::string&amp; s) : data(s) {}\n    \/\/ \u30e0\u30fc\u30d6\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n    LargeObject(LargeObject&amp;&amp; other) noexcept \n        : data(std::move(other.data)) {}\n};\n\n\/\/ \u30e0\u30fc\u30d6\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u6d3b\u7528\u4f8b\nvoid move_iterator_example() {\n    std::vector&lt;LargeObject&gt; source;\n    source.emplace_back(\"\u5927\u304d\u306a\u30c7\u30fc\u30bf1\");\n    source.emplace_back(\"\u5927\u304d\u306a\u30c7\u30fc\u30bf2\");\n\n    \/\/ \u30e0\u30fc\u30d6\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u30b3\u30d4\u30fc\n    std::vector&lt;LargeObject&gt; dest(\n        std::make_move_iterator(source.begin()),\n        std::make_move_iterator(source.end())\n    );\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u3063\u305f\u5b89\u5168\u306a\u30e1\u30e2\u30ea\u7ba1\u7406<\/h3>\n\n\n\n<p>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u304e\u306a\u304c\u3089\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u64cd\u4f5c\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-17\">1. unique_ptr\u306e\u6d3b\u7528<\/h4>\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;memory&gt;\n\n\/\/ \u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u30af\u30e9\u30b9\u306e\u4f8b\nclass ResourceManager {\n    std::unique_ptr&lt;char[]&gt; buffer;\n    size_t size;\n\npublic:\n    explicit ResourceManager(size_t n) \n        : buffer(std::make_unique&lt;char[]&gt;(n))\n        , size(n) {}\n\n    \/\/ \u5b89\u5168\u306a\u30d0\u30c3\u30d5\u30a1\u30b3\u30d4\u30fc\n    bool copyFrom(const void* src, size_t src_size) {\n        if (src_size &gt; size) return false;\n        std::copy_n(\n            static_cast&lt;const char*&gt;(src),\n            src_size,\n            buffer.get()\n        );\n        return true;\n    }\n\n    \/\/ \u30d0\u30c3\u30d5\u30a1\u306e\u53d6\u5f97\uff08\u8aad\u307f\u53d6\u308a\u5c02\u7528\uff09\n    const char* getData() const { return buffer.get(); }\n    size_t getSize() const { return size; }\n};<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-18\">2. shared_ptr\u306b\u3088\u308b\u5171\u6709\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406<\/h4>\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;memory&gt;\n#include &lt;map&gt;\n\n\/\/ \u5171\u6709\u30ea\u30bd\u30fc\u30b9\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5b9f\u88c5\u4f8b\nclass SharedResourceCache {\n    struct Resource {\n        std::vector&lt;char&gt; data;\n        explicit Resource(size_t size) : data(size) {}\n    };\n\n    std::map&lt;std::string, std::shared_ptr&lt;Resource&gt;&gt; cache;\n\npublic:\n    \/\/ \u30ea\u30bd\u30fc\u30b9\u306e\u53d6\u5f97\u307e\u305f\u306f\u4f5c\u6210\n    std::shared_ptr&lt;Resource&gt; getResource(\n        const std::string&amp; key, size_t size\n    ) {\n        auto it = cache.find(key);\n        if (it != cache.end()) {\n            return it-&gt;second;\n        }\n\n        auto resource = std::make_shared&lt;Resource&gt;(size);\n        cache[key] = resource;\n        return resource;\n    }\n\n    \/\/ \u30ea\u30bd\u30fc\u30b9\u306e\u30b3\u30d4\u30fc\n    bool copyResource(\n        const std::string&amp; from_key,\n        const std::string&amp; to_key\n    ) {\n        auto it = cache.find(from_key);\n        if (it == cache.end()) return false;\n\n        cache[to_key] = std::make_shared&lt;Resource&gt;(\n            *(it-&gt;second)\n        );\n        return true;\n    }\n};<\/pre>\n\n\n\n<p>\u30e2\u30c0\u30f3C++\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u5229\u70b9\uff1a<\/p>\n\n\n<div id=\"id-c9bc60cf-aab3-41c2-ad8f-660c1b4d900b\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6a5f\u80fd<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u7528\u9014<\/th><\/tr><\/thead><tbody><tr><td>std::copy<\/td><td>\u578b\u5b89\u5168\u6027\u3001\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af<\/td><td>\u4e00\u822c\u7684\u306a\u30b3\u30d4\u30fc\u64cd\u4f5c<\/td><\/tr><tr><td>std::move<\/td><td>\u4e0d\u8981\u306a\u30b3\u30d4\u30fc\u306e\u524a\u6e1b<\/td><td>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8ee2\u9001<\/td><\/tr><tr><td>unique_ptr<\/td><td>\u78ba\u5b9f\u306a\u30ea\u30bd\u30fc\u30b9\u89e3\u653e<\/td><td>\u6392\u4ed6\u7684\u306a\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406<\/td><\/tr><tr><td>shared_ptr<\/td><td>\u53c2\u7167\u30ab\u30a6\u30f3\u30c8\u7ba1\u7406<\/td><td>\u5171\u6709\u30ea\u30bd\u30fc\u30b9\u306e\u7ba1\u7406<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30d4\u30fc\u3068\u79fb\u52d5\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u306e\u6240\u6709\u6a29\u306e\u660e\u78ba\u5316<\/li>\n\n\n\n<li>\u4f8b\u5916\u5b89\u5168\u6027\u306e\u78ba\u4fdd<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30d0\u30e9\u30f3\u30b9<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30e2\u30c0\u30f3\u306a\u624b\u6cd5\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5b89\u5168\u3067\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-19\">memcpy\u306e\u4ee3\u66ff\u624b\u6bb5\u3068\u4f7f\u3044\u5206\u3051<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">memmove\u3068\u306e\u9055\u3044\u3068\u9069\u5207\u306a\u4f7f\u7528\u30b7\u30fc\u30f3<\/h3>\n\n\n\n<p>memcpy\u3068memmove\u306f\u4f3c\u305f\u3088\u3046\u306a\u6a5f\u80fd\u3092\u6301\u3061\u307e\u3059\u304c\u3001\u91cd\u8981\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u7279\u5fb4\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-21\">1. memmove\u306e\u7279\u5fb4\u3068\u5b89\u5168\u6027<\/h4>\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;cstring&gt;\n\nvoid demonstrate_memmove_safety() {\n    \/\/ \u30aa\u30fc\u30d0\u30fc\u30e9\u30c3\u30d7\u3059\u308b\u30e1\u30e2\u30ea\u9818\u57df\u306e\u30b3\u30d4\u30fc\n    char text[] = \"Hello, World!\";\n\n    \/\/ \u5b89\u5168: memmove\u306f\u30aa\u30fc\u30d0\u30fc\u30e9\u30c3\u30d7\u3092\u6b63\u3057\u304f\u51e6\u7406\n    memmove(text + 1, text, 5);  \/\/ \"HHello, World!\" \u3068\u306a\u308b\n\n    \/\/ \u5371\u967a: memcpy\u306f\u672a\u5b9a\u7fa9\u52d5\u4f5c\n    \/\/ memcpy(text + 1, text, 5);  \/\/ \u672a\u5b9a\u7fa9\u52d5\u4f5c!\n}\n\n\/\/ \u30aa\u30fc\u30d0\u30fc\u30e9\u30c3\u30d7\u5224\u5b9a\u95a2\u6570\nbool is_overlapping(\n    const void* dest,\n    const void* src,\n    size_t size\n) {\n    auto d = static_cast&lt;const char*&gt;(dest);\n    auto s = static_cast&lt;const char*&gt;(src);\n    return (d &lt; s + size) &amp;&amp; (s &lt; d + size);\n}\n\n\/\/ \u5b89\u5168\u306a\u30e1\u30e2\u30ea\u30b3\u30d4\u30fc\u95a2\u6570\nvoid* safe_memory_copy(\n    void* dest,\n    const void* src,\n    size_t size\n) {\n    if (is_overlapping(dest, src, size)) {\n        return memmove(dest, src, size);\n    }\n    return memcpy(dest, src, size);\n}<\/pre>\n\n\n\n<p>memcpy\u3068memmove\u306e\u6bd4\u8f03\uff1a<\/p>\n\n\n<div id=\"id-567b99ef-53fb-4d32-8ee0-394fc4cf1ed9\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4<\/th><th>memcpy<\/th><th>memmove<\/th><\/tr><\/thead><tbody><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u3088\u308a\u9ad8\u901f<\/td><td>\u3084\u3084\u9045\u3044<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u30aa\u30fc\u30d0\u30fc\u30e9\u30c3\u30d7<\/td><td>\u672a\u5b9a\u7fa9\u52d5\u4f5c<\/td><td>\u5b89\u5168\u306b\u51e6\u7406<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/td><td>\u5c11\u306a\u3044<\/td><td>\u4e00\u6642\u30d0\u30c3\u30d5\u30a1\u4f7f\u7528\u306e\u53ef\u80fd\u6027<\/td><\/tr><tr><td>\u4f7f\u7528\u30b7\u30fc\u30f3<\/td><td>\u72ec\u7acb\u3057\u305f\u30e1\u30e2\u30ea\u9818\u57df<\/td><td>\u30aa\u30fc\u30d0\u30fc\u30e9\u30c3\u30d7\u306e\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">C++17\u4ee5\u964d\u3067\u5c0e\u5165\u3055\u308c\u305f\u65b0\u3057\u3044\u30e1\u30e2\u30ea\u64cd\u4f5c\u6a5f\u80fd<\/h3>\n\n\n\n<p>C++17\u4ee5\u964d\u3067\u306f\u3001\u3088\u308a\u5b89\u5168\u3067\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u64cd\u4f5c\u306e\u305f\u3081\u306e\u65b0\u6a5f\u80fd\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-23\">1. std::byte\u64cd\u4f5c<\/h4>\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;cstddef&gt;\n#include &lt;array&gt;\n\nvoid demonstrate_byte_operations() {\n    \/\/ std::byte\u3092\u4f7f\u7528\u3057\u305f\u30e1\u30e2\u30ea\u64cd\u4f5c\n    std::array&lt;std::byte, 4&gt; data{};\n\n    \/\/ \u5024\u306e\u8a2d\u5b9a\n    data[0] = std::byte{65};  \/\/ 'A'\u306eASCII\u30b3\u30fc\u30c9\n\n    \/\/ \u30d0\u30a4\u30c8\u5358\u4f4d\u306e\u64cd\u4f5c\n    std::byte result = data[0] &amp; std::byte{0xFF};\n\n    \/\/ std::byte\u304b\u3089\u4ed6\u306e\u578b\u3078\u306e\u5909\u63db\n    char ch = std::to_integer&lt;char&gt;(data[0]);\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-24\">2. std::span\uff08C++20\uff09<\/h4>\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;span&gt;\n#include &lt;vector&gt;\n\n\/\/ span\u3092\u4f7f\u7528\u3057\u305f\u5b89\u5168\u306a\u30e1\u30e2\u30ea\u64cd\u4f5c\nvoid process_memory_range(std::span&lt;const std::byte&gt; data) {\n    \/\/ \u8aad\u307f\u53d6\u308a\u5c02\u7528\u30e1\u30e2\u30ea\u7bc4\u56f2\u306e\u51e6\u7406\n    for (const auto&amp; byte : data) {\n        \/\/ \u30d0\u30a4\u30c8\u3054\u3068\u306e\u51e6\u7406\n    }\n}\n\nvoid demonstrate_span_usage() {\n    std::vector&lt;std::byte&gt; buffer(1024);\n\n    \/\/ \u90e8\u5206\u7bc4\u56f2\u306e\u51e6\u7406\n    process_memory_range(\n        std::span(buffer).subspan(0, 512)\n    );\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-25\">3. \u30e1\u30e2\u30ea\u30ea\u30bd\u30fc\u30b9\uff08C++17\uff09<\/h4>\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;memory_resource&gt;\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u30e1\u30e2\u30ea\u30ea\u30bd\u30fc\u30b9\u306e\u4f8b\nclass TrackingMemoryResource \n    : public std::pmr::memory_resource {\n    std::size_t allocated = 0;\n\nprivate:\n    void* do_allocate(\n        std::size_t bytes,\n        std::size_t alignment\n    ) override {\n        allocated += bytes;\n        return ::operator new(bytes, \n                            std::align_val_t{alignment});\n    }\n\n    void do_deallocate(\n        void* p,\n        std::size_t bytes,\n        std::size_t alignment\n    ) override {\n        allocated -= bytes;\n        ::operator delete(p, \n                         std::align_val_t{alignment});\n    }\n\n    bool do_is_equal(\n        const memory_resource&amp; other\n    ) const noexcept override {\n        return this == &amp;other;\n    }\n\npublic:\n    std::size_t get_allocated() const { return allocated; }\n};<\/pre>\n\n\n\n<p>\u30e2\u30c0\u30f3\u306a\u30e1\u30e2\u30ea\u64cd\u4f5c\u6a5f\u80fd\u306e\u9078\u629e\u30ac\u30a4\u30c9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u57fa\u672c\u7684\u306a\u30e1\u30e2\u30ea\u30b3\u30d4\u30fc<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u72ec\u7acb\u3057\u305f\u9818\u57df\u9593: <code>memcpy<\/code><\/li>\n\n\n\n<li>\u30aa\u30fc\u30d0\u30fc\u30e9\u30c3\u30d7\u306e\u53ef\u80fd\u6027\u3042\u308a: <code>memmove<\/code><\/li>\n\n\n\n<li>\u30a4\u30c6\u30ec\u30fc\u30bf\u30d9\u30fc\u30b9: <code>std::copy<\/code><\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d0\u30a4\u30c8\u64cd\u4f5c<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u578b\u5b89\u5168\u306a\u30d0\u30a4\u30c8\u64cd\u4f5c: <code>std::byte<\/code><\/li>\n\n\n\n<li>\u751f\u306e\u30e1\u30e2\u30ea\u64cd\u4f5c: <code>char<\/code>\/<code>unsigned char<\/code><\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u7bc4\u56f2\u306e\u6271\u3044<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u56fa\u5b9a\u30b5\u30a4\u30ba: <code>std::array<\/code><\/li>\n\n\n\n<li>\u52d5\u7684\u30b5\u30a4\u30ba: <code>std::vector<\/code><\/li>\n\n\n\n<li>\u53c2\u7167\u306e\u307f: <code>std::span<\/code><\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7279\u6b8a\u306a\u30e1\u30e2\u30ea\u7ba1\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ab\u30b9\u30bf\u30e0\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3: <code>memory_resource<\/code><\/li>\n\n\n\n<li>\u30d7\u30fc\u30eb\u7ba1\u7406: <code>std::pmr::monotonic_buffer_resource<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8981\u4ef6\u306e\u78ba\u8a8d<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u5b89\u5168\u6027\u306e\u78ba\u4fdd<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u62bd\u8c61\u5316\u30ec\u30d9\u30eb\u306e\u9078\u629e<\/li>\n\n\n\n<li>\u5c06\u6765\u306e\u4fdd\u5b88\u6027\u3078\u306e\u914d\u616e<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u4ee3\u66ff\u624b\u6bb5\u3092\u9069\u5207\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u3067\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u64cd\u4f5c\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-26\">\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3068\u4e00\u822c\u7684\u306a\u30d0\u30b0\u306e\u9632\u6b62\u7b56<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-27\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u305f\u3081\u306eRAII\u30d1\u30bf\u30fc\u30f3\u306e\u9069\u7528<\/h3>\n\n\n\n<p>RAII\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u52b9\u679c\u7684\u306b\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u5b9f\u8df5\u7684\u306a\u5b9f\u88c5\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-28\">1. RAII\u3092\u7528\u3044\u305f\u30d0\u30c3\u30d5\u30a1\u7ba1\u7406\u30af\u30e9\u30b9<\/h4>\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;memory&gt;\n#include &lt;stdexcept&gt;\n\n\/\/ RAII\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u7528\u3057\u305f\u30d0\u30c3\u30d5\u30a1\u7ba1\u7406\u30af\u30e9\u30b9\nclass SafeBuffer {\n    std::unique_ptr&lt;uint8_t[]&gt; buffer;\n    size_t size_;\n\npublic:\n    explicit SafeBuffer(size_t size) \n        : buffer(std::make_unique&lt;uint8_t[]&gt;(size))\n        , size_(size) {\n        if (size == 0) {\n            throw std::invalid_argument(\"Buffer size cannot be zero\");\n        }\n    }\n\n    \/\/ \u5b89\u5168\u306a\u30b3\u30d4\u30fc\u64cd\u4f5c\n    bool copyFrom(const void* src, size_t src_size) {\n        if (!src || src_size &gt; size_) {\n            return false;\n        }\n        std::memcpy(buffer.get(), src, src_size);\n        return true;\n    }\n\n    \/\/ \u30c7\u30fc\u30bf\u30a2\u30af\u30bb\u30b9\n    const uint8_t* data() const { return buffer.get(); }\n    uint8_t* data() { return buffer.get(); }\n    size_t size() const { return size_; }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid demonstrate_safe_buffer() {\n    try {\n        \/\/ \u30d0\u30c3\u30d5\u30a1\u306e\u4f5c\u6210\n        SafeBuffer buf(1024);\n\n        \/\/ \u30c7\u30fc\u30bf\u306e\u30b3\u30d4\u30fc\n        const char* data = \"Hello, World!\";\n        if (!buf.copyFrom(data, strlen(data) + 1)) {\n            \/\/ \u30a8\u30e9\u30fc\u51e6\u7406\n        }\n\n        \/\/ \u30d0\u30c3\u30d5\u30a1\u306e\u81ea\u52d5\u89e3\u653e\uff08RAII\u306b\u3088\u308b\u4fdd\u8a3c\uff09\n    } catch (const std::exception&amp; e) {\n        \/\/ \u4f8b\u5916\u51e6\u7406\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-29\">2. \u30b9\u30b3\u30fc\u30d7\u30ac\u30fc\u30c9\u30d1\u30bf\u30fc\u30f3<\/h4>\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 F&gt;\nclass ScopeGuard {\n    F cleanup;\n    bool active;\n\npublic:\n    explicit ScopeGuard(F&amp;&amp; f) \n        : cleanup(std::move(f))\n        , active(true) {}\n\n    ~ScopeGuard() {\n        if (active) cleanup();\n    }\n\n    void dismiss() { active = false; }\n\n    ScopeGuard(const ScopeGuard&amp;) = delete;\n    ScopeGuard&amp; operator=(const ScopeGuard&amp;) = delete;\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid demonstrate_scope_guard() {\n    void* raw_buffer = malloc(1024);\n    auto guard = ScopeGuard([raw_buffer]() {\n        free(raw_buffer);\n    });\n\n    \/\/ \u51e6\u7406\u4e2d\u306b\u4f8b\u5916\u304c\u767a\u751f\u3057\u3066\u3082\u3001\n    \/\/ raw_buffer\u306f\u78ba\u5b9f\u306b\u89e3\u653e\u3055\u308c\u308b\n\n    \/\/ \u6b63\u5e38\u7d42\u4e86\u6642\u306b\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3092\u30b9\u30ad\u30c3\u30d7\u3059\u308b\u5834\u5408\n    \/\/ guard.dismiss();\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-30\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u3067\u306e\u30e1\u30e2\u30ea\u64cd\u4f5c\u306e\u691c\u8a3c\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u64cd\u4f5c\u306e\u5b89\u5168\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u3001comprehensive\uff08\u5305\u62ec\u7684\uff09\u306a\u30c6\u30b9\u30c8\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-31\">1. Google Test\u3092\u4f7f\u7528\u3057\u305f\u30c6\u30b9\u30c8\u4f8b<\/h4>\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;gtest\/gtest.h&gt;\n\nclass SafeBufferTest : public ::testing::Test {\nprotected:\n    void SetUp() override {\n        \/\/ \u30c6\u30b9\u30c8\u306e\u521d\u671f\u5316\n    }\n\n    void TearDown() override {\n        \/\/ \u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\n    }\n};\n\n\/\/ \u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u306e\u30c6\u30b9\u30c8\nTEST_F(SafeBufferTest, ValidatesBufferSize) {\n    EXPECT_THROW(SafeBuffer(0), std::invalid_argument);\n    EXPECT_NO_THROW(SafeBuffer(1));\n}\n\n\/\/ \u30b3\u30d4\u30fc\u64cd\u4f5c\u306e\u30c6\u30b9\u30c8\nTEST_F(SafeBufferTest, HandlesCopyOperations) {\n    SafeBuffer buf(10);\n    const char data[] = \"Test\";\n\n    EXPECT_TRUE(buf.copyFrom(data, sizeof(data)));\n    EXPECT_FALSE(buf.copyFrom(data, 11)); \/\/ \u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\n\n    \/\/ \u30b3\u30d4\u30fc\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u691c\u8a3c\n    EXPECT_EQ(0, memcmp(buf.data(), data, sizeof(data)));\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-32\">2. \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u30c1\u30a7\u30c3\u30af<\/h4>\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;sanitizer\/lsan_interface.h&gt;\n\nclass MemoryLeakTest : public ::testing::Test {\nprotected:\n    void TearDown() override {\n        \/\/ \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u30c1\u30a7\u30c3\u30af\n        __lsan_do_recoverable_leak_check();\n    }\n};\n\nTEST_F(MemoryLeakTest, NoLeaksInSafeBuffer) {\n    {\n        SafeBuffer buf(1024);\n        \/\/ \u69d8\u3005\u306a\u64cd\u4f5c\u3092\u5b9f\u884c\n    }\n    \/\/ \u30b9\u30b3\u30fc\u30d7\u3092\u629c\u3051\u305f\u6642\u70b9\u3067\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u304c\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\n}<\/pre>\n\n\n\n<p>\u4e00\u822c\u7684\u306a\u30d0\u30b0\u3068\u305d\u306e\u9632\u6b62\u7b56\uff1a<\/p>\n\n\n<div id=\"id-1cec2306-269e-438c-a804-9c286cfa2236\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30d0\u30b0\u306e\u7a2e\u985e<\/th><th>\u75c7\u72b6<\/th><th>\u9632\u6b62\u7b56<\/th><th>\u691c\u8a3c\u65b9\u6cd5<\/th><\/tr><\/thead><tbody><tr><td>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af<\/td><td>\u30ea\u30bd\u30fc\u30b9\u67af\u6e07<\/td><td>RAII\u30d1\u30bf\u30fc\u30f3<\/td><td>LSan, Valgrind<\/td><\/tr><tr><td>\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc<\/td><td>\u30af\u30e9\u30c3\u30b7\u30e5\/\u7834\u640d<\/td><td>\u5883\u754c\u30c1\u30a7\u30c3\u30af<\/td><td>ASan<\/td><\/tr><tr><td>Use-after-free<\/td><td>\u672a\u5b9a\u7fa9\u52d5\u4f5c<\/td><td>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf<\/td><td>UBSan<\/td><\/tr><tr><td>\u4e8c\u91cd\u89e3\u653e<\/td><td>\u30af\u30e9\u30c3\u30b7\u30e5<\/td><td>RAII\/\u30b9\u30b3\u30fc\u30d7\u7ba1\u7406<\/td><td>\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9632\u5fa1\u7684\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5165\u529b\u306e\u691c\u8a3c\ntemplate&lt;typename T&gt;\nbool verify_pointer(const T* ptr, size_t size) {\n    if (!ptr) return false;\n    if (size == 0) return false;\n    if (!std::align_val_t{alignof(T)}) return false;\n    return true;\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid safe_operation(const void* data, size_t size) {\n    if (!verify_pointer(data, size)) {\n        throw std::invalid_argument(\"Invalid input\");\n    }\n    \/\/ \u5b89\u5168\u306a\u64cd\u4f5c\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30a8\u30e9\u30fc\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u7d50\u679c\u578b\u3092\u4f7f\u7528\u3057\u305f\u30a8\u30e9\u30fc\u51e6\u7406\ntemplate&lt;typename T&gt;\nclass Result {\n    std::variant&lt;T, std::string&gt; data;\n\npublic:\n    static Result success(T value) {\n        return Result(std::move(value));\n    }\n\n    static Result error(std::string msg) {\n        return Result(std::move(msg));\n    }\n\n    bool is_success() const {\n        return std::holds_alternative&lt;T&gt;(data);\n    }\n\n    const T&amp; value() const {\n        return std::get&lt;T&gt;(data);\n    }\n\n    const std::string&amp; error() const {\n        return std::get&lt;std::string&gt;(data);\n    }\n};<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u9632\u6b62\u7b56\u3068\u30c6\u30b9\u30c8\u624b\u6cd5\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u30e1\u30e2\u30ea\u64cd\u4f5c\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":{"0":"post-2038","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-cpp","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2038","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=2038"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2038\/revisions"}],"predecessor-version":[{"id":2039,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2038\/revisions\/2039"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2038"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2038"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2038"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}