{"id":1931,"date":"2025-03-24T08:49:35","date_gmt":"2025-03-23T23:49:35","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1931"},"modified":"2025-03-24T08:49:35","modified_gmt":"2025-03-23T23:49:35","slug":"c%e3%81%aechar%e3%82%92%e5%ae%8c%e5%85%a8%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%ef%bc%81%e3%83%a1%e3%83%a2%e3%83%aa%e5%8a%b9%e7%8e%87%e3%81%a8%e3%83%91%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%b3","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1931","title":{"rendered":"C++\u306echar\u3092\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\uff01\u30e1\u30e2\u30ea\u52b9\u7387\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u5b9f\u8df5\u30ac\u30a4\u30c9"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">C++\u306b\u304a\u3051\u308bchar\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">char\u30c7\u30fc\u30bf\u578b\u304c1\u30d0\u30a4\u30c8\u3067\u3042\u308b\u7406\u7531\u3068\u4f7f\u3044\u5206\u3051<\/a>      <\/li>      <li>        <a href=\"#i-2\">char\u3068unsigned char\u306e\u9055\u3044\u3068\u4f7f\u3044\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-3\">\u6587\u5b57\u30ea\u30c6\u30e9\u30eb\u3068char\u306e\u95a2\u4fc2\u6027<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-4\">char\u3068string\u306e\u9055\u3044\u3092\u5fb9\u5e95\u89e3\u8aac<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-5\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6bd4\u8f03\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff<\/a>      <\/li>      <li>        <a href=\"#i-6\">\u6587\u5b57\u5217\u51e6\u7406\u306b\u304a\u3051\u308b\u6709\u5229\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-7\">\u6587\u5b57\u5217\u578b\u304b\u3089char\u3078\u306e\u5b89\u5168\u306a\u5909\u63db\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-8\">\u5b9f\u52d9\u3067\u906d\u9047\u3059\u308bchar\u95a2\u9023\u306e\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-9\">\u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306b\u3088\u308b\u6587\u5b57\u5316\u3051\u306e\u9632\u6b62\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-10\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050char\u306e\u9069\u5207\u306a\u7ba1\u7406\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u51e6\u7406\u6642\u306e\u6ce8\u610f\u70b9\u3068\u5bfe\u7b56<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">char\u3092\u4f7f\u7528\u3057\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u624b\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">\u914d\u5217\u51e6\u7406\u306e\u9ad8\u901f\u5316\u624b\u6cd5\u3068\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c<\/a>      <\/li>      <li>        <a href=\"#i-14\">\u30e1\u30e2\u30ea\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u8003\u616e\u3057\u305fchar\u914d\u5217\u306e\u8a2d\u8a08<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">\u30ad\u30e3\u30c3\u30b7\u30e5\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308bchar\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-16\">\u30e2\u30c0\u30f3C++\u306b\u304a\u3051\u308bchar\u306e\u65b0\u3057\u3044\u9032\u5316\u3068\u4f7f\u3044\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">C++17\u4ee5\u964d\u3067\u8ffd\u52a0\u3055\u308c\u305f\u6587\u5b57\u51e6\u7406\u306e\u65b0\u6a5f\u80fd<\/a>      <\/li>      <li>        <a href=\"#i-18\">char8_t\u3068UTF-8\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u95a2\u4fc2<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u5c06\u6765\u306eC++\u898f\u683c\u3067\u4e88\u5b9a\u3055\u308c\u3066\u3044\u308bchar\u95a2\u9023\u306e\u6539\u5584<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">C++\u306b\u304a\u3051\u308bchar\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<p>C++\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u3001<code>char<\/code>\u578b\u306f\u6700\u3082\u57fa\u672c\u7684\u304b\u3064\u91cd\u8981\u306a\u30c7\u30fc\u30bf\u578b\u306e1\u3064\u3067\u3059\u3002\u3053\u306e\u7ae0\u3067\u306f\u3001<code>char<\/code>\u578b\u306e\u672c\u8cea\u7684\u306a\u7279\u5fb4\u3068\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">char\u30c7\u30fc\u30bf\u578b\u304c1\u30d0\u30a4\u30c8\u3067\u3042\u308b\u7406\u7531\u3068\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<p><code>char<\/code>\u578b\u304c1\u30d0\u30a4\u30c8\u3067\u3042\u308b\u3053\u3068\u306b\u306f\u3001\u6b74\u53f2\u7684\u80cc\u666f\u3068\u6280\u8853\u7684\u306a\u7406\u7531\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1\u30d0\u30a4\u30c8 = 8\u30d3\u30c3\u30c8\u3067\u3001ASCII\u6587\u5b57\uff080-127\uff09\u3092\u5b8c\u5168\u306b\u8868\u73fe\u53ef\u80fd<\/li>\n\n\n\n<li>\u57fa\u672c\u7684\u306a\u82f1\u6570\u5b57\u3084\u8a18\u53f7\u3092\u52b9\u7387\u7684\u306b\u683c\u7d0d\u3067\u304d\u308b\u6700\u5c0f\u5358\u4f4d<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u304c\u53ef\u80fd<\/li>\n<\/ul>\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=\"\">\/\/ char\u306e\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\nchar single_char = 'A';  \/\/ 1\u30d0\u30a4\u30c8\u306e\u30e1\u30e2\u30ea\u3092\u4f7f\u7528\nstd::cout &lt;&lt; \"\u30b5\u30a4\u30ba: \" &lt;&lt; sizeof(single_char) &lt;&lt; \"\u30d0\u30a4\u30c8\" &lt;&lt; std::endl;  \/\/ \u51fa\u529b: 1\u30d0\u30a4\u30c8<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u7528\u9014\u306b\u3088\u308b\u4f7f\u3044\u5206\u3051<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6587\u5b57\u30c7\u30fc\u30bf\u306e\u683c\u7d0d: <code>char<\/code><\/li>\n\n\n\n<li>\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u306e\u51e6\u7406: <code>unsigned char<\/code><\/li>\n\n\n\n<li>\u30c6\u30ad\u30b9\u30c8\u30d0\u30c3\u30d5\u30a1\u306e\u5b9f\u88c5: <code>char[]<\/code><\/li>\n<\/ul>\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=\"\">\/\/ \u7570\u306a\u308b\u7528\u9014\u3067\u306e\u4f7f\u7528\u4f8b\nchar text_char = 'B';           \/\/ \u6587\u5b57\u3068\u3057\u3066\u4f7f\u7528\nunsigned char binary = 0xFF;    \/\/ \u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u3068\u3057\u3066\u4f7f\u7528\nchar buffer[256];              \/\/ \u30d0\u30c3\u30d5\u30a1\u3068\u3057\u3066\u4f7f\u7528<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">char\u3068unsigned char\u306e\u9055\u3044\u3068\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p><code>char<\/code>\u578b\u3068<code>unsigned char<\/code>\u578b\u306e\u4e3b\u306a\u9055\u3044\u306f\u3001\u7b26\u53f7\u306e\u6709\u7121\u3068\u305d\u308c\u306b\u4f34\u3046\u5024\u306e\u7bc4\u56f2\u3067\u3059\u3002<\/p>\n\n\n<div id=\"id-f2b96124-c8d5-43ab-a088-e2c631739f86\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u578b<\/th><th>\u5024\u306e\u7bc4\u56f2<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><\/tr><\/thead><tbody><tr><td><code>char<\/code><\/td><td>-128 \u301c 127<\/td><td>\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf<\/td><\/tr><tr><td><code>unsigned char<\/code><\/td><td>0 \u301c 255<\/td><td>\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\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=\"\">\/\/ char\u3068unsigned char\u306e\u52d5\u4f5c\u306e\u9055\u3044\nchar signed_char = 200;         \/\/ \u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u767a\u751f\uff08\u5b9f\u88c5\u4f9d\u5b58\u306e\u52d5\u4f5c\uff09\nunsigned char unsigned_char = 200;  \/\/ \u6b63\u5e38\u306b200\u3068\u3057\u3066\u683c\u7d0d\n\n\/\/ \u30d3\u30c3\u30c8\u6f14\u7b97\u3067\u306e\u4f7f\u7528\u4f8b\nunsigned char mask = 0xF0;\nunsigned char value = 0x5A;\nunsigned char result = value &amp; mask;  \/\/ \u30d3\u30c3\u30c8\u6f14\u7b97\u306b\u9069\u3057\u3066\u3044\u308b<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">\u6587\u5b57\u30ea\u30c6\u30e9\u30eb\u3068char\u306e\u95a2\u4fc2\u6027<\/h3>\n\n\n\n<p>C++\u306b\u304a\u3051\u308b\u6587\u5b57\u30ea\u30c6\u30e9\u30eb\u306f\u3001<code>char<\/code>\u578b\u306e\u5024\u3092\u76f4\u63a5\u8868\u73fe\u3059\u308b\u65b9\u6cd5\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u30ea\u30c6\u30e9\u30eb\u306e\u7a2e\u985e<\/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=\"\">char normal = 'A';          \/\/ \u901a\u5e38\u306e\u6587\u5b57\u30ea\u30c6\u30e9\u30eb\nchar escaped = '\\n';        \/\/ \u30a8\u30b9\u30b1\u30fc\u30d7\u30b7\u30fc\u30b1\u30f3\u30b9\nchar octal = '\\141';       \/\/ 8\u9032\u6570\u8868\u73fe\uff08'a'\u3068\u540c\u3058\uff09\nchar hex = '\\x61';         \/\/ 16\u9032\u6570\u8868\u73fe\uff08'a'\u3068\u540c\u3058\uff09<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u578b\u5909\u63db\u3068\u30ea\u30c6\u30e9\u30eb\u306e\u95a2\u4fc2<\/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=\"\">\/\/ \u6587\u5b57\u30ea\u30c6\u30e9\u30eb\u3068\u6570\u5024\u306e\u76f8\u4e92\u5909\u63db\nchar c = 65;              \/\/ \u6570\u5024\u304b\u3089\u6587\u5b57\uff08'A'\uff09\nint n = 'A';              \/\/ \u6587\u5b57\u304b\u3089\u6570\u5024\uff0865\uff09\n\n\/\/ \u578b\u5909\u63db\u306e\u6ce8\u610f\u70b9\nchar overflow = 256;      \/\/ \u8b66\u544a\uff1a\u5024\u304c\u5207\u308a\u6368\u3066\u3089\u308c\u308b<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u5217\u30ea\u30c6\u30e9\u30eb\u3068\u306e\u9055\u3044<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">char c = 'A';             \/\/ \u5358\u4e00\u6587\u5b57\uff08char\u30ea\u30c6\u30e9\u30eb\uff09\nconst char* str = \"A\";    \/\/ \u6587\u5b57\u5217\u30ea\u30c6\u30e9\u30eb\uff08null\u7d42\u7aef\u6587\u5b57\u542b\u3080\uff09\n\n\/\/ \u30b5\u30a4\u30ba\u306e\u9055\u3044\nstd::cout &lt;&lt; sizeof(c) &lt;&lt; std::endl;    \/\/ \u51fa\u529b: 1\nstd::cout &lt;&lt; sizeof(str) &lt;&lt; std::endl;  \/\/ \u51fa\u529b: \u30dd\u30a4\u30f3\u30bf\u306e\u30b5\u30a4\u30ba\uff08\u901a\u5e384\u307e\u305f\u306f8\uff09<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001<code>char<\/code>\u578b\u306f\u5358\u7d14\u306a\u30c7\u30fc\u30bf\u578b\u3067\u3042\u308a\u306a\u304c\u3089\u3001C++\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u975e\u5e38\u306b\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002\u6b21\u7ae0\u3067\u306f\u3001<code>char<\/code>\u578b\u3068<code>string<\/code>\u578b\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u3001\u3055\u3089\u306b\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-4\">char\u3068string\u306e\u9055\u3044\u3092\u5fb9\u5e95\u89e3\u8aac<\/h2>\n\n\n\n<p>C++\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u51e6\u7406\u306b\u304a\u3044\u3066\u3001<code>char<\/code>\u578b\u3068<code>string<\/code>\u578b\u306e\u9069\u5207\u306a\u9078\u629e\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u52b9\u7387\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6bd4\u8f03\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u89b3\u70b9\u304b\u3089\u3001<code>char<\/code>\u3068<code>string<\/code>\u306e\u7279\u5fb4\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u69cb\u9020\u306e\u9055\u3044<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;string&gt;\n#include &lt;iostream&gt;\n\nint main() {\n    \/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6bd4\u8f03\n    char single_char = 'A';                    \/\/ 1\u30d0\u30a4\u30c8\n    char char_array[10] = \"Hello\";             \/\/ 10\u30d0\u30a4\u30c8\uff08\u56fa\u5b9a\u9577\uff09\n    std::string str = \"Hello\";                 \/\/ \u52d5\u7684\u306a\u30e1\u30e2\u30ea\uff08\u5b9f\u88c5\u4f9d\u5b58\uff09\n\n    std::cout &lt;&lt; \"char size: \" &lt;&lt; sizeof(single_char) &lt;&lt; \"bytes\\n\"\n              &lt;&lt; \"char array size: \" &lt;&lt; sizeof(char_array) &lt;&lt; \"bytes\\n\"\n              &lt;&lt; \"string size: \" &lt;&lt; sizeof(str) &lt;&lt; \"bytes\\n\"\n              &lt;&lt; \"string actual size: \" &lt;&lt; str.capacity() &lt;&lt; \"bytes\\n\";\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u6bd4\u8f03\u8868<\/strong><\/li>\n<\/ol>\n\n\n<div id=\"id-f4ca4713-1bcb-48a0-89a2-60e84b151e2a\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u578b<\/th><th>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/th><th>\u7279\u5fb4<\/th><\/tr><\/thead><tbody><tr><td><code>char<\/code><\/td><td>1\u30d0\u30a4\u30c8<\/td><td>\u56fa\u5b9a\u30b5\u30a4\u30ba\u3001\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u306a\u3057<\/td><\/tr><tr><td><code>char[]<\/code><\/td><td>N \u30d0\u30a4\u30c8<\/td><td>\u56fa\u5b9a\u30b5\u30a4\u30ba\u3001\u5883\u754c\u30c1\u30a7\u30c3\u30af\u306a\u3057<\/td><\/tr><tr><td><code>string<\/code><\/td><td>24-32\u30d0\u30a4\u30c8 + \u30c7\u30fc\u30bf\u30b5\u30a4\u30ba<\/td><td>\u52d5\u7684\u30b5\u30a4\u30ba\u3001\u5883\u754c\u30c1\u30a7\u30c3\u30af\u3042\u308a<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u6587\u5b57\u5217\u51e6\u7406\u306b\u304a\u3051\u308b\u6709\u5229\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p>\u6587\u5b57\u5217\u51e6\u7406\u306e\u30b7\u30ca\u30ea\u30aa\u306b\u5fdc\u3058\u3066\u3001\u9069\u5207\u306a\u30c7\u30fc\u30bf\u578b\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>char\u304c\u6709\u5229\u306a\u30b1\u30fc\u30b9<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5358\u4e00\u6587\u5b57\u306e\u51e6\u7406\nchar c = getchar();\nif (c &gt;= 'a' &amp;&amp; c &lt;= 'z') {\n    c = c - 'a' + 'A';  \/\/ \u5927\u6587\u5b57\u5909\u63db\uff08\u9ad8\u901f\uff09\n}\n\n\/\/ \u56fa\u5b9a\u9577\u30d0\u30c3\u30d5\u30a1\u3067\u306e\u51e6\u7406\nchar buffer[1024];  \/\/ \u30b9\u30bf\u30c3\u30af\u4e0a\u306b\u78ba\u4fdd\uff08\u9ad8\u901f\uff09\nfgets(buffer, sizeof(buffer), stdin);<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>string\u304c\u6709\u5229\u306a\u30b1\u30fc\u30b9<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u52d5\u7684\u306a\u6587\u5b57\u5217\u7d50\u5408\nstd::string result;\nfor (const auto&amp; word : words) {\n    result += word + \" \";  \/\/ \u81ea\u52d5\u7684\u306b\u30e1\u30e2\u30ea\u7ba1\u7406\n}\n\n\/\/ \u6587\u5b57\u5217\u64cd\u4f5c\u304c\u591a\u3044\u5834\u5408\nstd::string text = \"Hello, World!\";\ntext.replace(0, 5, \"Hi\");  \/\/ \u5b89\u5168\u3067\u4fbf\u5229\u306aAPI<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u6587\u5b57\u5217\u578b\u304b\u3089char\u3078\u306e\u5b89\u5168\u306a\u5909\u63db\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u6587\u5b57\u5217\u578b\u3068\u6587\u5b57\u578b\u306e\u9593\u306e\u5909\u63db\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u6ce8\u610f\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5358\u4e00\u6587\u5b57\u306e\u62bd\u51fa<\/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\u6587\u5b57\u62bd\u51fa\nstd::string str = \"Hello\";\nchar first = str.empty() ? '\\0' : str[0];  \/\/ \u5883\u754c\u30c1\u30a7\u30c3\u30af\n\n\/\/ \u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u305f\u5b89\u5168\u306a\u51e6\u7406\nfor (char c : str) {\n    \/\/ \u5404\u6587\u5b57\u306b\u5bfe\u3059\u308b\u51e6\u7406\n    process_char(c);\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u5bfe\u7b56<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">void safe_string_to_char_array(const std::string&amp; src, char* dest, size_t dest_size) {\n    if (dest_size == 0) return;\n\n    size_t copy_size = std::min(src.length(), dest_size - 1);\n    std::copy_n(src.begin(), copy_size, dest);\n    dest[copy_size] = '\\0';  \/\/ null\u7d42\u7aef\u3092\u4fdd\u8a3c\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nchar buffer[5];\nstd::string long_string = \"Hello, World!\";\nsafe_string_to_char_array(long_string, buffer, sizeof(buffer));\n\/\/ buffer \u306b\u306f \"Hell\" + null\u7d42\u7aef\u304c\u683c\u7d0d\u3055\u308c\u308b<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u5909\u63db<\/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=\"\">\/\/ \u52b9\u7387\u7684\u306a\u6587\u5b57\u5217\u2192\u6587\u5b57\u914d\u5217\u5909\u63db\nstd::string str = \"Performance\";\nstd::vector&lt;char&gt; vec(str.begin(), str.end());  \/\/ \u4e00\u62ec\u30b3\u30d4\u30fc\n\n\/\/ \u6587\u5b57\u914d\u5217\u2192\u6587\u5b57\u5217\u306e\u52b9\u7387\u7684\u306a\u5909\u63db\nchar arr[] = \"Optimization\";\nstd::string new_str(arr, arr + strlen(arr));  \/\/ \u5bb9\u91cf\u3092\u4e8b\u524d\u306b\u78ba\u4fdd<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001<code>char<\/code>\u3068<code>string<\/code>\u306f\u305d\u308c\u305e\u308c\u306b\u9577\u6240\u3068\u77ed\u6240\u304c\u3042\u308a\u3001\u4f7f\u7528\u3059\u308b\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u9078\u629e\u3092\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u6b21\u7ae0\u3067\u306f\u3001\u5b9f\u52d9\u3067\u76f4\u9762\u3059\u308b\u5177\u4f53\u7684\u306a\u554f\u984c\u3068\u3001\u305d\u306e\u89e3\u6c7a\u7b56\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-8\">\u5b9f\u52d9\u3067\u906d\u9047\u3059\u308bchar\u95a2\u9023\u306e\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/h2>\n\n\n\n<p>\u5b9f\u52d9\u306eC++\u958b\u767a\u306b\u304a\u3044\u3066\u3001<code>char<\/code>\u578b\u306b\u95a2\u9023\u3059\u308b\u554f\u984c\u306f\u983b\u7e41\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u304f\u3042\u308b\u554f\u984c\u3068\u305d\u306e\u5177\u4f53\u7684\u306a\u89e3\u6c7a\u7b56\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306b\u3088\u308b\u6587\u5b57\u5316\u3051\u306e\u9632\u6b62\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u554f\u984c\u306f\u3001\u7279\u306b\u56fd\u969b\u5316\u5bfe\u5fdc\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u91cd\u8981\u306a\u8ab2\u984c\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u691c\u51fa\u3068\u5909\u63db<\/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;locale&gt;\n#include &lt;codecvt&gt;\n#include &lt;string&gt;\n\n\/\/ UTF-8\u3068\u30ef\u30a4\u30c9\u6587\u5b57\u5217\u306e\u76f8\u4e92\u5909\u63db\nstd::wstring utf8_to_wide(const std::string&amp; utf8_str) {\n    try {\n        std::wstring_convert&lt;std::codecvt_utf8&lt;wchar_t&gt;&gt; converter;\n        return converter.from_bytes(utf8_str);\n    } catch (const std::exception&amp; e) {\n        \/\/ \u5909\u63db\u30a8\u30e9\u30fc\u51e6\u7406\n        return L\"\";  \/\/ \u307e\u305f\u306f\u9069\u5207\u306a\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\n    }\n}\n\n\/\/ \u30ef\u30a4\u30c9\u6587\u5b57\u5217\u304b\u3089UTF-8\u3078\u306e\u5909\u63db\nstd::string wide_to_utf8(const std::wstring&amp; wide_str) {\n    try {\n        std::wstring_convert&lt;std::codecvt_utf8&lt;wchar_t&gt;&gt; converter;\n        return converter.to_bytes(wide_str);\n    } catch (const std::exception&amp; e) {\n        return \"\";  \/\/ \u307e\u305f\u306f\u9069\u5207\u306a\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30ed\u30b1\u30fc\u30eb\u8a2d\u5b9a\u306b\u3088\u308b\u6587\u5b57\u5316\u3051\u9632\u6b62<\/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;locale&gt;\n\nvoid setup_locale() {\n    try {\n        \/\/ \u30b7\u30b9\u30c6\u30e0\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30ed\u30b1\u30fc\u30eb\u3092\u8a2d\u5b9a\n        std::locale::global(std::locale(\"\"));\n\n        \/\/ \u7279\u5b9a\u306e\u30ed\u30b1\u30fc\u30eb\u3092\u8a2d\u5b9a\uff08\u4f8b\uff1a\u65e5\u672c\u8a9e\uff09\n        std::locale::global(std::locale(\"ja_JP.UTF-8\"));\n    } catch (const std::runtime_error&amp; e) {\n        \/\/ \u30ed\u30b1\u30fc\u30eb\u8a2d\u5b9a\u5931\u6557\u6642\u306e\u51e6\u7406\n        std::cerr &lt;&lt; \"Locale setting failed: \" &lt;&lt; e.what() &lt;&lt; std::endl;\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050char\u306e\u9069\u5207\u306a\u7ba1\u7406\u65b9\u6cd5<\/h3>\n\n\n\n<p><code>char<\/code>\u914d\u5217\u3084\u30dd\u30a4\u30f3\u30bf\u306e\u4e0d\u9069\u5207\u306a\u7ba1\u7406\u306f\u3001\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3084\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u539f\u56e0\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u7528\u3057\u305f\u5b89\u5168\u306a\u30e1\u30e2\u30ea\u7ba1\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=\"\">#include &lt;memory&gt;\n#include &lt;cstring&gt;\n\nclass CharBuffer {\nprivate:\n    std::unique_ptr&lt;char[]&gt; buffer;\n    size_t size;\n\npublic:\n    explicit CharBuffer(size_t size) : buffer(new char[size]), size(size) {\n        std::memset(buffer.get(), 0, size);\n    }\n\n    \/\/ \u5b89\u5168\u306a\u30c7\u30fc\u30bf\u30b3\u30d4\u30fc\n    bool copyData(const char* data, size_t data_size) {\n        if (data_size &gt; size) return false;\n        std::memcpy(buffer.get(), data, data_size);\n        return true;\n    }\n\n    \/\/ \u30c7\u30fc\u30bf\u30a2\u30af\u30bb\u30b9\n    const char* getData() const { return buffer.get(); }\n    size_t getSize() const { return size; }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u9632\u6b62<\/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;array&gt;\n\n\/\/ \u56fa\u5b9a\u9577\u30d0\u30c3\u30d5\u30a1\u306e\u5b89\u5168\u306a\u4f7f\u7528\ntemplate&lt;size_t N&gt;\nclass SafeCharBuffer {\nprivate:\n    std::array&lt;char, N&gt; buffer;\n\npublic:\n    SafeCharBuffer() {\n        buffer.fill(0);\n    }\n\n    \/\/ \u5883\u754c\u30c1\u30a7\u30c3\u30af\u4ed8\u304d\u306e\u66f8\u304d\u8fbc\u307f\n    bool write(size_t pos, char value) {\n        if (pos &gt;= N) return false;\n        buffer[pos] = value;\n        return true;\n    }\n\n    \/\/ \u5b89\u5168\u306a\u8aad\u307f\u53d6\u308a\n    std::pair&lt;bool, char&gt; read(size_t pos) const {\n        if (pos &gt;= N) return {false, 0};\n        return {true, buffer[pos]};\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u51e6\u7406\u6642\u306e\u6ce8\u610f\u70b9\u3068\u5bfe\u7b56<\/h3>\n\n\n\n<p>\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u306e\u51e6\u7406\u306f\u3001\u7279\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u306a\u9818\u57df\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u306e\u6b63\u3057\u3044\u5224\u5b9a<\/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;cstdint&gt;\n\nclass UTF8Validator {\npublic:\n    static bool isValidUTF8(const char* str, size_t length) {\n        const uint8_t* bytes = reinterpret_cast&lt;const uint8_t*&gt;(str);\n        size_t i = 0;\n\n        while (i &lt; length) {\n            if (bytes[i] &lt;= 0x7F) {\n                \/\/ ASCII\u6587\u5b57\n                i++;\n            } else if ((bytes[i] &amp; 0xE0) == 0xC0) {\n                \/\/ 2\u30d0\u30a4\u30c8\u6587\u5b57\n                if (i + 1 &gt;= length || (bytes[i+1] &amp; 0xC0) != 0x80)\n                    return false;\n                i += 2;\n            } else if ((bytes[i] &amp; 0xF0) == 0xE0) {\n                \/\/ 3\u30d0\u30a4\u30c8\u6587\u5b57\n                if (i + 2 &gt;= length || \n                    (bytes[i+1] &amp; 0xC0) != 0x80 || \n                    (bytes[i+2] &amp; 0xC0) != 0x80)\n                    return false;\n                i += 3;\n            } else if ((bytes[i] &amp; 0xF8) == 0xF0) {\n                \/\/ 4\u30d0\u30a4\u30c8\u6587\u5b57\n                if (i + 3 &gt;= length ||\n                    (bytes[i+1] &amp; 0xC0) != 0x80 ||\n                    (bytes[i+2] &amp; 0xC0) != 0x80 ||\n                    (bytes[i+3] &amp; 0xC0) != 0x80)\n                    return false;\n                i += 4;\n            } else {\n                return false;\n            }\n        }\n        return true;\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u5217\u9577\u306e\u6b63\u3057\u3044\u8a08\u7b97<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;string&gt;\n\nclass StringUtils {\npublic:\n    \/\/ UTF-8\u6587\u5b57\u5217\u306e\u6587\u5b57\u6570\u3092\u8a08\u7b97\n    static size_t utf8_length(const std::string&amp; str) {\n        size_t length = 0;\n        for (size_t i = 0; i &lt; str.length();) {\n            unsigned char c = static_cast&lt;unsigned char&gt;(str[i]);\n            if (c &lt;= 0x7F) {\n                i += 1;\n            } else if (c &lt;= 0xDF) {\n                i += 2;\n            } else if (c &lt;= 0xEF) {\n                i += 3;\n            } else {\n                i += 4;\n            }\n            length++;\n        }\n        return length;\n    }\n\n    \/\/ \u5b89\u5168\u306a\u6587\u5b57\u5217\u5207\u308a\u53d6\u308a\n    static std::string safe_substring(const std::string&amp; str, \n                                    size_t start_char, \n                                    size_t char_count) {\n        std::string result;\n        size_t current_char = 0;\n        size_t byte_pos = 0;\n\n        \/\/ \u958b\u59cb\u4f4d\u7f6e\u307e\u3067\u79fb\u52d5\n        while (current_char &lt; start_char &amp;&amp; byte_pos &lt; str.length()) {\n            unsigned char c = static_cast&lt;unsigned char&gt;(str[byte_pos]);\n            byte_pos += (c &lt;= 0x7F) ? 1 : (c &lt;= 0xDF) ? 2 : \n                       (c &lt;= 0xEF) ? 3 : 4;\n            current_char++;\n        }\n\n        \/\/ \u6307\u5b9a\u6587\u5b57\u6570\u5206\u62bd\u51fa\n        size_t chars_copied = 0;\n        while (chars_copied &lt; char_count &amp;&amp; byte_pos &lt; str.length()) {\n            unsigned char c = static_cast&lt;unsigned char&gt;(str[byte_pos]);\n            size_t char_bytes = (c &lt;= 0x7F) ? 1 : (c &lt;= 0xDF) ? 2 : \n                               (c &lt;= 0xEF) ? 3 : 4;\n            result.append(str.substr(byte_pos, char_bytes));\n            byte_pos += char_bytes;\n            chars_copied++;\n        }\n\n        return result;\n    }\n};<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u89e3\u6c7a\u7b56\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001<code>char<\/code>\u578b\u306b\u95a2\u9023\u3059\u308b\u591a\u304f\u306e\u5b9f\u52d9\u4e0a\u306e\u554f\u984c\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u7ae0\u3067\u306f\u3001\u3055\u3089\u306b\u8e0f\u307f\u8fbc\u3093\u3067\u3001<code>char<\/code>\u3092\u4f7f\u7528\u3057\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u624b\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">char\u3092\u4f7f\u7528\u3057\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u624b\u6cd5<\/h2>\n\n\n\n<p><code>char<\/code>\u578b\u3092\u52b9\u7387\u7684\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u5b9f\u8df5\u7684\u306a\u6700\u9069\u5316\u624b\u6cd5\u3068\u305d\u306e\u52b9\u679c\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u914d\u5217\u51e6\u7406\u306e\u9ad8\u901f\u5316\u624b\u6cd5\u3068\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u30a2\u30af\u30bb\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u3053\u3068\u3067\u3001<code>char<\/code>\u914d\u5217\u306e\u51e6\u7406\u901f\u5ea6\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>SIMD\u547d\u4ee4\u3092\u6d3b\u7528\u3057\u305f\u4e26\u5217\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=\"\">#include &lt;immintrin.h&gt;  \/\/ SSE\/AVX\u547d\u4ee4\u7528\n#include &lt;chrono&gt;\n\n\/\/ SIMD\u547d\u4ee4\u3092\u4f7f\u7528\u3057\u305f\u6587\u5b57\u5217\u6bd4\u8f03\nbool fast_strcmp(const char* str1, const char* str2, size_t len) {\n    size_t i = 0;\n\n    \/\/ 16\u30d0\u30a4\u30c8\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3055\u308c\u305f\u90e8\u5206\u3092SIMD\u3067\u51e6\u7406\n    for (; i + 16 &lt;= len; i += 16) {\n        __m128i v1 = _mm_loadu_si128(reinterpret_cast&lt;const __m128i*&gt;(str1 + i));\n        __m128i v2 = _mm_loadu_si128(reinterpret_cast&lt;const __m128i*&gt;(str2 + i));\n        if (!_mm_movemask_epi8(_mm_cmpeq_epi8(v1, v2)))\n            return false;\n    }\n\n    \/\/ \u6b8b\u308a\u306e\u90e8\u5206\u3092\u901a\u5e38\u51e6\u7406\n    for (; i &lt; len; ++i) {\n        if (str1[i] != str2[i])\n            return false;\n    }\n    return true;\n}\n\n\/\/ \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7528\u95a2\u6570\nvoid benchmark_comparison() {\n    const size_t SIZE = 1000000;\n    std::string str1(SIZE, 'a');\n    std::string str2(SIZE, 'a');\n\n    auto start = std::chrono::high_resolution_clock::now();\n    bool result1 = std::memcmp(str1.c_str(), str2.c_str(), SIZE) == 0;\n    auto end = std::chrono::high_resolution_clock::now();\n    auto std_time = std::chrono::duration_cast&lt;std::chrono::microseconds&gt;(end - start);\n\n    start = std::chrono::high_resolution_clock::now();\n    bool result2 = fast_strcmp(str1.c_str(), str2.c_str(), SIZE);\n    end = std::chrono::high_resolution_clock::now();\n    auto simd_time = std::chrono::duration_cast&lt;std::chrono::microseconds&gt;(end - start);\n\n    std::cout &lt;&lt; \"Standard memcmp: \" &lt;&lt; std_time.count() &lt;&lt; \"\u00b5s\\n\"\n              &lt;&lt; \"SIMD optimized: \" &lt;&lt; simd_time.count() &lt;&lt; \"\u00b5s\\n\";\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30eb\u30fc\u30d7\u5c55\u958b\u306b\u3088\u308b\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u6700\u9069\u5316\u3055\u308c\u305f\u6587\u5b57\u30ab\u30a6\u30f3\u30c8\u95a2\u6570\nsize_t optimized_char_count(const char* str, char target, size_t len) {\n    size_t count = 0;\n    size_t i = 0;\n\n    \/\/ 4\u3064\u306e\u30ab\u30a6\u30f3\u30bf\u3092\u4f7f\u7528\u3057\u3066\u30eb\u30fc\u30d7\u5c55\u958b\n    size_t count1 = 0, count2 = 0, count3 = 0, count4 = 0;\n    for (; i + 4 &lt;= len; i += 4) {\n        count1 += (str[i] == target);\n        count2 += (str[i+1] == target);\n        count3 += (str[i+2] == target);\n        count4 += (str[i+3] == target);\n    }\n    count = count1 + count2 + count3 + count4;\n\n    \/\/ \u6b8b\u308a\u306e\u8981\u7d20\u3092\u51e6\u7406\n    for (; i &lt; len; ++i) {\n        count += (str[i] == target);\n    }\n\n    return count;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30e1\u30e2\u30ea\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u8003\u616e\u3057\u305fchar\u914d\u5217\u306e\u8a2d\u8a08<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u30d2\u30c3\u30c8\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u5236\u5fa1<\/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;memory&gt;\n\n\/\/ \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u5236\u5fa1\u3055\u308c\u305f\u6587\u5b57\u914d\u5217\u30af\u30e9\u30b9\ntemplate&lt;size_t Alignment = 16&gt;\nclass AlignedCharArray {\nprivate:\n    std::aligned_storage_t&lt;sizeof(char), Alignment&gt;* data;\n    size_t size;\n\npublic:\n    explicit AlignedCharArray(size_t n) : size(n) {\n        data = reinterpret_cast&lt;decltype(data)&gt;(\n            std::aligned_alloc(Alignment, n * sizeof(char))\n        );\n    }\n\n    ~AlignedCharArray() {\n        std::free(data);\n    }\n\n    \/\/ \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3055\u308c\u305f\u30dd\u30a4\u30f3\u30bf\u3092\u53d6\u5f97\n    char* get() {\n        return reinterpret_cast&lt;char*&gt;(data);\n    }\n\n    const char* get() const {\n        return reinterpret_cast&lt;const char*&gt;(data);\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u610f\u8b58\u3057\u305f\u8a2d\u8a08<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u5883\u754c\u3092\u8003\u616e\u3057\u305f\u6587\u5b57\u5217\u51e6\u7406\u69cb\u9020\u4f53\nstruct CacheOptimizedString {\n    static constexpr size_t CACHE_LINE_SIZE = 64;\n\n    \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u5883\u754c\u306b\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3055\u308c\u305f\u30c7\u30fc\u30bf\n    alignas(CACHE_LINE_SIZE) char data[CACHE_LINE_SIZE];\n    size_t length;\n\n    void set(const char* str, size_t len) {\n        length = std::min(len, CACHE_LINE_SIZE - 1);\n        std::memcpy(data, str, length);\n        data[length] = '\\0';\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u30ad\u30e3\u30c3\u30b7\u30e5\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308bchar\u306e\u6d3b\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30ad\u30e3\u30c3\u30b7\u30e5\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u30c7\u30fc\u30bf\u69cb\u9020\u3068\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u8a2d\u8a08\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30ad\u30e3\u30c3\u30b7\u30e5\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u306a\u6587\u5b57\u5217\u691c\u7d22<\/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=\"\">\/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u6587\u5b57\u5217\u691c\u7d22\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\nclass CacheEfficientSearch {\nprivate:\n    static constexpr size_t CACHE_LINE_SIZE = 64;\n    static constexpr size_t LOOKUP_TABLE_SIZE = 256;\n\n    \/\/ \u6587\u5b57\u51fa\u73fe\u4f4d\u7f6e\u306e\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u30c6\u30fc\u30d6\u30eb\n    struct LookupTable {\n        alignas(CACHE_LINE_SIZE) bool exists[LOOKUP_TABLE_SIZE];\n\n        void build(const char* pattern, size_t length) {\n            std::memset(exists, 0, LOOKUP_TABLE_SIZE);\n            for (size_t i = 0; i &lt; length; ++i) {\n                exists[static_cast&lt;unsigned char&gt;(pattern[i])] = true;\n            }\n        }\n    };\n\npublic:\n    static size_t find(const char* text, size_t text_len,\n                      const char* pattern, size_t pattern_len) {\n        if (pattern_len == 0) return 0;\n        if (pattern_len &gt; text_len) return text_len;\n\n        LookupTable lookup;\n        lookup.build(pattern, pattern_len);\n\n        \/\/ \u30e1\u30a4\u30f3\u306e\u691c\u7d22\u30eb\u30fc\u30d7\n        for (size_t i = 0; i &lt;= text_len - pattern_len;) {\n            \/\/ \u30d1\u30bf\u30fc\u30f3\u306e\u6700\u521d\u306e\u6587\u5b57\u304c\u898b\u3064\u304b\u308b\u307e\u3067\u30b9\u30ad\u30c3\u30d7\n            if (!lookup.exists[static_cast&lt;unsigned char&gt;(text[i])]) {\n                ++i;\n                continue;\n            }\n\n            \/\/ \u30d1\u30bf\u30fc\u30f3\u306e\u5b8c\u5168\u4e00\u81f4\u30c1\u30a7\u30c3\u30af\n            bool match = true;\n            for (size_t j = 0; j &lt; pattern_len; ++j) {\n                if (text[i + j] != pattern[j]) {\n                    match = false;\n                    break;\n                }\n            }\n\n            if (match) return i;\n            ++i;\n        }\n\n        return text_len;\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u30ed\u30fc\u30ab\u30ea\u30c6\u30a3\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30c7\u30fc\u30bf\u30ed\u30fc\u30ab\u30ea\u30c6\u30a3\u3092\u8003\u616e\u3057\u305f\u6587\u5b57\u5217\u51e6\u7406\u30af\u30e9\u30b9\nclass LocalityOptimizedString {\nprivate:\n    static constexpr size_t BLOCK_SIZE = 1024;\n    std::vector&lt;std::array&lt;char, BLOCK_SIZE&gt;&gt; blocks;\n    size_t total_size;\n\npublic:\n    void append(const char* str, size_t len) {\n        size_t remaining = len;\n        size_t offset = 0;\n\n        while (remaining &gt; 0) {\n            size_t block_idx = total_size \/ BLOCK_SIZE;\n            size_t block_offset = total_size % BLOCK_SIZE;\n\n            if (block_idx &gt;= blocks.size()) {\n                blocks.emplace_back();\n            }\n\n            size_t copy_size = std::min(BLOCK_SIZE - block_offset, remaining);\n            std::memcpy(blocks[block_idx].data() + block_offset,\n                       str + offset, copy_size);\n\n            remaining -= copy_size;\n            offset += copy_size;\n            total_size += copy_size;\n        }\n    }\n\n    \/\/ \u30d6\u30ed\u30c3\u30af\u5358\u4f4d\u3067\u306e\u4e26\u5217\u51e6\u7406\u304c\u53ef\u80fd\n    void process_parallel(std::function&lt;void(const char*, size_t)&gt; processor) {\n        #pragma omp parallel for\n        for (size_t i = 0; i &lt; blocks.size(); ++i) {\n            size_t block_size = (i == blocks.size() - 1) ?\n                total_size - i * BLOCK_SIZE : BLOCK_SIZE;\n            processor(blocks[i].data(), block_size);\n        }\n    }\n};<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u624b\u6cd5\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5927\u898f\u6a21\u306a\u6587\u5b57\u5217\u51e6\u7406\u3067\u3082\u9ad8\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u6b21\u7ae0\u3067\u306f\u3001\u30e2\u30c0\u30f3C++\u306b\u304a\u3051\u308b<code>char<\/code>\u578b\u306e\u65b0\u3057\u3044\u6a5f\u80fd\u3068\u9032\u5316\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">\u30e2\u30c0\u30f3C++\u306b\u304a\u3051\u308bchar\u306e\u65b0\u3057\u3044\u9032\u5316\u3068\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>C++\u8a00\u8a9e\u306e\u9032\u5316\u306b\u4f34\u3044\u3001<code>char<\/code>\u578b\u3068\u305d\u306e\u95a2\u9023\u6a5f\u80fd\u3082\u5927\u304d\u304f\u767a\u5c55\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u3053\u3053\u3067\u306f\u3001\u6700\u65b0\u306eC++\u898f\u683c\u3067\u5c0e\u5165\u3055\u308c\u305f\u65b0\u6a5f\u80fd\u3068\u3001\u5c06\u6765\u306e\u5c55\u671b\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">C++17\u4ee5\u964d\u3067\u8ffd\u52a0\u3055\u308c\u305f\u6587\u5b57\u51e6\u7406\u306e\u65b0\u6a5f\u80fd<\/h3>\n\n\n\n<p>C++17\u4ee5\u964d\u3001\u6587\u5b57\u51e6\u7406\u306b\u95a2\u3059\u308b\u591a\u304f\u306e\u6539\u5584\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u578b\u306e\u660e\u793a\u7684\u306a\u533a\u5225<\/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;cstdint&gt;\n\n\/\/ C++17\u3067\u5c0e\u5165\u3055\u308c\u305f\u65b0\u3057\u3044\u6587\u5b57\u578b\nchar default_char = 'A';      \/\/ \u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u4f9d\u5b58\nchar8_t utf8_char = u8'\u3042';   \/\/ UTF-8\u6587\u5b57\uff08C++20\uff09\nchar16_t utf16_char = u'\u3042';  \/\/ UTF-16\u6587\u5b57\nchar32_t utf32_char = U'\u3042';  \/\/ UTF-32\u6587\u5b57\n\n\/\/ \u30b5\u30a4\u30ba\u3068\u578b\u306e\u95a2\u4fc2\nstatic_assert(sizeof(char8_t) == 1);\nstatic_assert(sizeof(char16_t) == 2);\nstatic_assert(sizeof(char32_t) == 4);<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u5217\u30d3\u30e5\u30fc\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;string_view&gt;\n\n\/\/ \u52b9\u7387\u7684\u306a\u6587\u5b57\u5217\u53c2\u7167\nclass CharProcessor {\npublic:\n    \/\/ string_view\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30d4\u30fc\u3092\u907f\u3051\u308b\n    static bool containsChar(std::string_view str, char target) {\n        return str.find(target) != std::string_view::npos;\n    }\n\n    \/\/ \u8907\u6570\u306e\u6587\u5b57\u5217\u3092\u52b9\u7387\u7684\u306b\u51e6\u7406\n    static std::vector&lt;std::string_view&gt; splitByChar(\n        std::string_view str, char delimiter) {\n        std::vector&lt;std::string_view&gt; result;\n        size_t start = 0;\n        size_t end = str.find(delimiter);\n\n        while (end != std::string_view::npos) {\n            result.push_back(str.substr(start, end - start));\n            start = end + 1;\n            end = str.find(delimiter, start);\n        }\n\n        if (start &lt; str.length()) {\n            result.push_back(str.substr(start));\n        }\n\n        return result;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">char8_t\u3068UTF-8\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u95a2\u4fc2<\/h3>\n\n\n\n<p>C++20\u3067\u5c0e\u5165\u3055\u308c\u305f<code>char8_t<\/code>\u578b\u306f\u3001UTF-8\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u6b63\u78ba\u306b\u6271\u3046\u305f\u3081\u306e\u91cd\u8981\u306a\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>UTF-8\u6587\u5b57\u5217\u306e\u9069\u5207\u306a\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=\"\">#include &lt;string&gt;\n\nclass UTF8Handler {\npublic:\n    \/\/ UTF-8\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u6b63\u78ba\u306b\u30ab\u30a6\u30f3\u30c8\n    static size_t utf8_length(std::u8string_view str) {\n        size_t length = 0;\n        for (auto c : str) {\n            \/\/ \u5148\u982d\u30d0\u30a4\u30c8\u306e\u307f\u3092\u30ab\u30a6\u30f3\u30c8\n            if ((c &amp; 0xC0) != 0x80) {\n                ++length;\n            }\n        }\n        return length;\n    }\n\n    \/\/ UTF-8\u6587\u5b57\u5217\u306e\u691c\u8a3c\n    static bool is_valid_utf8(std::u8string_view str) {\n        enum class State {\n            Start,\n            Cont1,\n            Cont2,\n            Cont3\n        } state = State::Start;\n\n        for (auto c : str) {\n            switch (state) {\n                case State::Start:\n                    if ((c &amp; 0x80) == 0) continue;         \/\/ ASCII\n                    if ((c &amp; 0xE0) == 0xC0) state = State::Cont1;  \/\/ 2\u30d0\u30a4\u30c8\n                    else if ((c &amp; 0xF0) == 0xE0) state = State::Cont2;  \/\/ 3\u30d0\u30a4\u30c8\n                    else if ((c &amp; 0xF8) == 0xF0) state = State::Cont3;  \/\/ 4\u30d0\u30a4\u30c8\n                    else return false;\n                    break;\n\n                case State::Cont3:\n                    if ((c &amp; 0xC0) != 0x80) return false;\n                    state = State::Cont2;\n                    break;\n\n                case State::Cont2:\n                    if ((c &amp; 0xC0) != 0x80) return false;\n                    state = State::Cont1;\n                    break;\n\n                case State::Cont1:\n                    if ((c &amp; 0xC0) != 0x80) return false;\n                    state = State::Start;\n                    break;\n            }\n        }\n        return state == State::Start;\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u578b\u306e\u76f8\u4e92\u5909\u63db<\/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;string&gt;\n#include &lt;string_view&gt;\n\nclass CharConverter {\npublic:\n    \/\/ char8_t\u3068char\u306e\u5b89\u5168\u306a\u5909\u63db\n    static std::string to_string(std::u8string_view utf8_str) {\n        return std::string(\n            reinterpret_cast&lt;const char*&gt;(utf8_str.data()),\n            utf8_str.size()\n        );\n    }\n\n    static std::u8string to_u8string(std::string_view str) {\n        return std::u8string(\n            reinterpret_cast&lt;const char8_t*&gt;(str.data()),\n            str.size()\n        );\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u5c06\u6765\u306eC++\u898f\u683c\u3067\u4e88\u5b9a\u3055\u308c\u3066\u3044\u308bchar\u95a2\u9023\u306e\u6539\u5584<\/h3>\n\n\n\n<p>C++23\u4ee5\u964d\u3067\u4e88\u5b9a\u3055\u308c\u3066\u3044\u308b\u6539\u5584\u3068\u3001\u305d\u308c\u306b\u5411\u3051\u305f\u6e96\u5099\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e88\u5b9a\u3055\u308c\u3066\u3044\u308b\u4e3b\u306a\u6539\u5584\u70b9<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ C++23\u3067\u306e\u6539\u5584\u4f8b\uff08\u63d0\u6848\u6bb5\u968e\uff09\nnamespace cpp23_features {\n    \/\/ \u3088\u308a\u7c21\u6f54\u306aUTF-8\u30ea\u30c6\u30e9\u30eb\n    auto utf8_str = \"Hello, \u4e16\u754c\"s8;  \/\/ std::u8string\n\n    \/\/ \u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6539\u5584\n    template&lt;typename... Args&gt;\n    std::u8string format_utf8(std::u8string_view fmt, Args&amp;&amp;... args) {\n        \/\/ \u5c06\u6765\u7684\u306a\u5b9f\u88c5\n        return std::format(fmt, std::forward&lt;Args&gt;(args)...);\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u5c06\u6765\u306b\u5411\u3051\u305f\u5805\u7262\u306a\u8a2d\u8a08<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5c06\u6765\u306e\u5909\u66f4\u306b\u5099\u3048\u305f\u62e1\u5f35\u53ef\u80fd\u306a\u8a2d\u8a08\nclass ModernCharHandler {\npublic:\n    \/\/ \u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u62bd\u8c61\u5316\n    enum class Encoding {\n        ASCII,\n        UTF8,\n        UTF16,\n        UTF32\n    };\n\n    template&lt;typename CharT&gt;\n    struct CharTraits {\n        static constexpr Encoding encoding = \n            std::is_same_v&lt;CharT, char8_t&gt; ? Encoding::UTF8 :\n            std::is_same_v&lt;CharT, char16_t&gt; ? Encoding::UTF16 :\n            std::is_same_v&lt;CharT, char32_t&gt; ? Encoding::UTF32 :\n            Encoding::ASCII;\n\n        static constexpr size_t max_code_points = \n            encoding == Encoding::UTF8 ? 4 :\n            encoding == Encoding::UTF16 ? 2 : 1;\n    };\n\n    \/\/ \u5c06\u6765\u306e\u62e1\u5f35\u306b\u5099\u3048\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\n    template&lt;typename CharT&gt;\n    class CharProcessor {\n    public:\n        virtual ~CharProcessor() = default;\n\n        \/\/ \u57fa\u672c\u64cd\u4f5c\n        virtual bool validate(std::basic_string_view&lt;CharT&gt;) = 0;\n        virtual size_t length(std::basic_string_view&lt;CharT&gt;) = 0;\n\n        \/\/ \u5c06\u6765\u306e\u62e1\u5f35\u7528\n        virtual void process(std::basic_string_view&lt;CharT&gt;) = 0;\n    };\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u4e92\u63db\u6027\u306e\u4e21\u7acb<\/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=\"\">\/\/ \u5c06\u6765\u306e\u6700\u9069\u5316\u306b\u5099\u3048\u305f\u8a2d\u8a08\nclass FutureProofCharOps {\nprivate:\n    \/\/ SSO\uff08Small String Optimization\uff09\u306e\u6539\u5584\u306b\u5099\u3048\u305f\u5b9f\u88c5\n    static constexpr size_t SMALL_STRING_SIZE = 16;\n    union {\n        char small_[SMALL_STRING_SIZE];\n        struct {\n            char* ptr_;\n            size_t size_;\n            size_t capacity_;\n        } large_;\n    };\n    bool is_small_ : 1;\n\npublic:\n    \/\/ \u6700\u9069\u5316\u3055\u308c\u305f\u64cd\u4f5c\n    void assign(const char* str, size_t len) {\n        if (len &lt;= SMALL_STRING_SIZE - 1) {\n            if (!is_small_ &amp;&amp; large_.ptr_) {\n                delete[] large_.ptr_;\n            }\n            std::memcpy(small_, str, len);\n            small_[len] = '\\0';\n            is_small_ = true;\n        } else {\n            char* new_ptr = new char[len + 1];\n            std::memcpy(new_ptr, str, len);\n            new_ptr[len] = '\\0';\n\n            if (!is_small_ &amp;&amp; large_.ptr_) {\n                delete[] large_.ptr_;\n            }\n\n            large_.ptr_ = new_ptr;\n            large_.size_ = len;\n            large_.capacity_ = len + 1;\n            is_small_ = false;\n        }\n    }\n};<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u3068\u6539\u5584\u306b\u3088\u308a\u3001C++\u3067\u306e\u6587\u5b57\u51e6\u7406\u306f\u3088\u308a\u5b89\u5168\u3067\u52b9\u7387\u7684\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u5c06\u6765\u306e\u898f\u683c\u3067\u306f\u3001\u3055\u3089\u306a\u308b\u6539\u5584\u304c\u671f\u5f85\u3055\u308c\u3066\u3044\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-1931","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\/1931","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=1931"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1931\/revisions"}],"predecessor-version":[{"id":1932,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1931\/revisions\/1932"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}