{"id":2185,"date":"2025-03-24T08:48:04","date_gmt":"2025-03-23T23:48:04","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=2185"},"modified":"2025-03-24T08:48:29","modified_gmt":"2025-03-23T23:48:29","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91c%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%83%e3%83%88%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%892024%ef%bc%9a5","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=2185","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011C++\u306e\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u5b8c\u5168\u30ac\u30a4\u30c92024\uff1a5\u3064\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3068\u6027\u80fd\u6bd4\u8f03"},"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++\u3067\u306e\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u306f\u4f55\u304b\uff1a\u57fa\u672c\u6982\u5ff5\u306e\u7406\u89e3<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">C++\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u9032\u5316\uff1aC++20\u3053\u308c\u307e\u3067\u306e\u5909\u9077<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">std::format\u3092\u4f7f\u7528\u3057\u305f\u6700\u65b0\u306e\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u624b\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">std::format\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3068\u69cb\u6587<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u306e\u8a73\u7d30\u89e3\u8aac<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">\u30ab\u30b9\u30bf\u30e0\u30d5\u30a9\u30fc\u30de\u30c3\u30bf\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">\u5f93\u6765\u306e\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u624b\u6cd5\u3068\u6bd4\u8f03<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">sprintf\u7cfb\u95a2\u6570\u306e\u7279\u5fb4\u3068\u6ce8\u610f\u70b9<\/a>      <\/li>      <li>        <a href=\"#i-9\">std::ostream\u3092\u4f7f\u7528\u3057\u305f\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-10\">Boost.Format\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u6d3b\u7528\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-11\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-12\">\u5404\u624b\u6cd5\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c\u3068\u6bd4\u8f03<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">\u30e1\u30e2\u30ea\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8003\u616e\u3057\u305f\u6700\u3082\u91cd\u8981\u306a\u653b\u7565\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-14\">\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u30b7\u30fc\u30f3\u3068\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-15\">\u30ed\u30b0\u51fa\u529b\u3067\u306e\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-16\">\u5927\u91cf\u306e\u6587\u5b57\u5217\u51e6\u7406\u3092\u884c\u3046\u969b\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-17\">\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u5b89\u5168\u306a\u5b9f\u88c5\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\">C++\u3067\u306e\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u306f\u4f55\u304b\uff1a\u57fa\u672c\u6982\u5ff5\u306e\u7406\u89e3<\/h3>\n\n\n\n<p>\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u5185\u3067\u52d5\u7684\u306b\u6587\u5b57\u5217\u3092\u751f\u6210\u3059\u308b\u51e6\u7406\u306e\u3053\u3068\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u30ed\u30b0\u51fa\u529b\u3084\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u8868\u793a\u306a\u3069\u3001\u5909\u6570\u306e\u5024\u3092\u6587\u5b57\u5217\u306b\u7d44\u307f\u8fbc\u3080\u5834\u5408\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u57fa\u672c\u7684\u306a\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\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=\"\">\/\/ \u5f93\u6765\u306e printf \u30b9\u30bf\u30a4\u30eb\nprintf(\"Hello, %s! Your score is %d\\n\", name, score);\n\n\/\/ \u30e2\u30c0\u30f3\u306a std::format \u30b9\u30bf\u30a4\u30eb\uff08C++20\u4ee5\u964d\uff09\nstd::cout &lt;&lt; std::format(\"Hello, {}! Your score is {}\\n\", name, score);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">C++\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u9032\u5316\uff1aC++20\u3053\u308c\u307e\u3067\u306e\u5909\u9077<\/h3>\n\n\n\n<p>C++\u3067\u306e\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u9032\u5316\u3092\u9042\u3052\u3066\u304d\u307e\u3057\u305f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>C\u8a00\u8a9e\u7531\u6765\u306e\u65b9\u6cd5\uff08C++98\u4ee5\u524d\uff09<\/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=\"\">   \/\/ sprintf \u3092\u4f7f\u7528\u3057\u305f\u65b9\u6cd5\n   char buffer[100];\n   sprintf(buffer, \"Score: %d\", score);\n   \/\/ \u5371\u967a\uff1a\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u53ef\u80fd\u6027\u3042\u308a<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u5217\u30b9\u30c8\u30ea\u30fc\u30e0\uff08C++98\uff09<\/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=\"\">   \/\/ std::ostringstream \u3092\u4f7f\u7528\n   std::ostringstream oss;\n   oss &lt;&lt; \"Score: \" &lt;&lt; score;\n   std::string result = oss.str();\n   \/\/ \u5b89\u5168\u3060\u304c\u3001\u3084\u3084\u5197\u9577<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>Boost.Format\uff08\u5916\u90e8\u30e9\u30a4\u30d6\u30e9\u30ea\uff09<\/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=\"\">   \/\/ Boost.Format \u3092\u4f7f\u7528\n   std::string result = boost::str(boost::format(\"Score: %1%\") % score);\n   \/\/ \u3088\u308a\u67d4\u8edf\u3060\u304c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u8ab2\u984c<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>std::format\uff08C++20\uff09<\/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=\"\">   \/\/ \u73fe\u4ee3\u7684\u306a\u65b9\u6cd5\n   std::string result = std::format(\"Score: {}\", score);\n   \/\/ \u578b\u5b89\u5168\u3001\u9ad8\u6027\u80fd\u3001\u4f7f\u3044\u3084\u3059\u3044<\/pre>\n\n\n\n<p>\u4e3b\u306a\u6539\u5584\u70b9\uff1a<\/p>\n\n\n<div id=\"id-8d318d8d-213e-4e38-8514-8206af2e4629\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6642\u671f<\/th><th>\u6539\u5584\u70b9<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><\/tr><\/thead><tbody><tr><td>C++98<\/td><td>\u6587\u5b57\u5217\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u5c0e\u5165<\/td><td>\u30e1\u30e2\u30ea\u5b89\u5168\u6027\u306e\u5411\u4e0a<\/td><\/tr><tr><td>C++11<\/td><td>\u6587\u5b57\u5217\u30ea\u30c6\u30e9\u30eb\u306e\u6539\u5584<\/td><td>Unicode\u5bfe\u5fdc\u306e\u5f37\u5316<\/td><\/tr><tr><td>C++17<\/td><td>string_view\u306e\u5c0e\u5165<\/td><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a<\/td><\/tr><tr><td>C++20<\/td><td>std::format\u306e\u5c0e\u5165<\/td><td>\u578b\u5b89\u5168\u6027\u3068\u4f7f\u3044\u3084\u3059\u3055\u306e\u4e21\u7acb<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u73fe\u4ee3\u306eC++\u3067\u306e\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306f\u3001\u4ee5\u4e0b\u306e\u8981\u4ef6\u3092\u6e80\u305f\u3059\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u578b\u5b89\u5168\u6027<\/strong>: \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u578b\u30c1\u30a7\u30c3\u30af<\/li>\n\n\n\n<li><strong>\u30e1\u30e2\u30ea\u5b89\u5168\u6027<\/strong>: \u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u9632\u6b62<\/li>\n\n\n\n<li><strong>\u52b9\u7387\u6027<\/strong>: \u6700\u5c0f\u9650\u306e\u30e1\u30e2\u30ea\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3<\/li>\n\n\n\n<li><strong>\u53ef\u8aad\u6027<\/strong>: \u76f4\u611f\u7684\u306a\u69cb\u6587<\/li>\n\n\n\n<li><strong>\u62e1\u5f35\u6027<\/strong>: \u30ab\u30b9\u30bf\u30e0\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u30b5\u30dd\u30fc\u30c8<\/li>\n<\/ul>\n\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001C++20\u3067\u5c0e\u5165\u3055\u308c\u305f<code>std::format<\/code>\u306e\u8a73\u7d30\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">std::format\u3092\u4f7f\u7528\u3057\u305f\u6700\u65b0\u306e\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u624b\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">std::format\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3068\u69cb\u6587<\/h3>\n\n\n\n<p><code>std::format<\/code>\u306f\u3001C++20\u3067\u5c0e\u5165\u3055\u308c\u305f\u578b\u5b89\u5168\u306a\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6a5f\u80fd\u3067\u3059\u3002\u4f7f\u3044\u65b9\u306f\u76f4\u611f\u7684\u3067\u3001Python\u306e<code>str.format()<\/code>\u306b\u4f3c\u305f\u69cb\u6587\u3092\u63a1\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\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=\"\">#include &lt;format&gt;\n#include &lt;string&gt;\n\nint main() {\n    \/\/ \u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\n    std::string name = \"Alice\";\n    int age = 25;\n    auto result = std::format(\"Name: {}, Age: {}\", name, age);\n\n    \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6307\u5b9a\u3057\u305f\u4f7f\u7528\n    auto result2 = std::format(\"Age: {1}, Name: {0}\", name, age);\n\n    \/\/ \u8907\u6570\u56de\u306e\u4f7f\u7528\n    auto result3 = std::format(\"Name: {0}, {0} is {1} years old\", name, age);\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u306e\u8a73\u7d30\u89e3\u8aac<\/h3>\n\n\n\n<p>\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u5b50\u306f\u3001\u51fa\u529b\u306e\u898b\u305f\u76ee\u3092\u7d30\u304b\u304f\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3067\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;format&gt;\n\nint main() {\n    \/\/ \u6570\u5024\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\n    double pi = 3.14159265359;\n\n    \/\/ \u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u6307\u5b9a\n    std::format(\"Pi: {:.2f}\", pi);  \/\/ \"Pi: 3.14\"\n\n    \/\/ \u5e45\u3068\u57cb\u3081\u6587\u5b57\u306e\u6307\u5b9a\n    std::format(\"Pi: {:10.2f}\", pi);  \/\/ \"Pi:       3.14\"\n    std::format(\"Pi: {:0&gt;10.2f}\", pi); \/\/ \"Pi: 0000003.14\"\n\n    \/\/ \u6574\u6570\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\n    int num = 42;\n    std::format(\"Decimal: {}\", num);      \/\/ \"42\"\n    std::format(\"Hex: {:x}\", num);        \/\/ \"2a\"\n    std::format(\"Binary: {:b}\", num);     \/\/ \"101010\"\n    std::format(\"Octal: {:o}\", num);      \/\/ \"52\"\n\n    \/\/ \u914d\u7f6e\u6307\u5b9a\n    std::format(\"|{:&lt;10}|\", \"left\");   \/\/ |left      |\n    std::format(\"|{:^10}|\", \"center\"); \/\/ |  center  |\n    std::format(\"|{:&gt;10}|\", \"right\");  \/\/ |     right|\n}<\/pre>\n\n\n\n<p>\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u5b50\u306e\u4e00\u89a7\uff1a<\/p>\n\n\n<div id=\"id-76111312-4f81-482e-9f46-0e37f2498d4e\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6307\u5b9a\u5b50<\/th><th>\u8aac\u660e<\/th><th>\u4f8b<\/th><\/tr><\/thead><tbody><tr><td><code>d<\/code><\/td><td>10\u9032\u6570<\/td><td><code>\"{:d}\"<\/code> \u2192 \u201c42\u201d<\/td><\/tr><tr><td><code>x\/X<\/code><\/td><td>16\u9032\u6570<\/td><td><code>\"{:x}\"<\/code> \u2192 \u201c2a\u201d<\/td><\/tr><tr><td><code>o<\/code><\/td><td>8\u9032\u6570<\/td><td><code>\"{:o}\"<\/code> \u2192 \u201c52\u201d<\/td><\/tr><tr><td><code>b<\/code><\/td><td>2\u9032\u6570<\/td><td><code>\"{:b}\"<\/code> \u2192 \u201c101010\u201d<\/td><\/tr><tr><td><code>f\/F<\/code><\/td><td>\u56fa\u5b9a\u5c0f\u6570\u70b9<\/td><td><code>\"{:.2f}\"<\/code> \u2192 \u201c3.14\u201d<\/td><\/tr><tr><td><code>e\/E<\/code><\/td><td>\u6307\u6570\u8868\u8a18<\/td><td><code>\"{:e}\"<\/code> \u2192 \u201c3.14e+00\u201d<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30ab\u30b9\u30bf\u30e0\u30d5\u30a9\u30fc\u30de\u30c3\u30bf\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u72ec\u81ea\u306e\u578b\u306b\u5bfe\u3057\u3066\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u306b\u306f\u3001<code>formatter<\/code>\u7279\u6b8a\u5316\u3092\u5b9f\u88c5\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;format&gt;\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u578b\u306e\u5b9a\u7fa9\nstruct Point {\n    int x, y;\n};\n\n\/\/ formatter\u306e\u7279\u6b8a\u5316\ntemplate &lt;&gt; struct std::formatter&lt;Point&gt; {\n    constexpr auto parse(format_parse_context&amp; ctx) {\n        return ctx.begin(); \/\/ \u30b7\u30f3\u30d7\u30eb\u306a\u5b9f\u88c5\u306e\u5834\u5408\n    }\n\n    auto format(const Point&amp; p, format_context&amp; ctx) {\n        \/\/ \u5b9f\u969b\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u51e6\u7406\n        return format_to(ctx.out(), \"({}, {})\", p.x, p.y);\n    }\n};\n\nint main() {\n    Point p{10, 20};\n    \/\/ \u30ab\u30b9\u30bf\u30e0\u30d5\u30a9\u30fc\u30de\u30c3\u30bf\u306e\u4f7f\u7528\n    std::cout &lt;&lt; std::format(\"Position: {}\", p); \/\/ \"Position: (10, 20)\"\n\n    \/\/ \u4ed6\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\n    std::cout &lt;&lt; std::format(\"Position: {:^15}\", p); \/\/ \u4e2d\u592e\u63c3\u3048\u306715\u6587\u5b57\u5e45\n}<\/pre>\n\n\n\n<p>std::format\u306e\u9ad8\u5ea6\u306a\u4f7f\u7528\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u4ed8\u304d\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">auto value = -42;\n\/\/ \u6b63\u8ca0\u3067\u7570\u306a\u308b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\nauto result = std::format(\"{}\", value &lt; 0 ? \n    std::format(\"({:d})\", -value) : \n    std::format(\"{:d}\", value));<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30ed\u30b1\u30fc\u30eb\u5bfe\u5fdc<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;locale&gt;\n\/\/ \u30ed\u30b1\u30fc\u30eb\u4f9d\u5b58\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\nauto number = 1234567.89;\nauto result = std::format(std::locale(\"de_DE\"), \"{:L}\", number);\n\/\/ \u2192 \"1.234.567,89\"<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30a8\u30e9\u30fc\u51e6\u7406<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">try {\n    \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u7bc4\u56f2\u5916\u306e\u5834\u5408\n    auto result = std::format(\"{0} {1}\", \"hello\");\n} catch (const std::format_error&amp; e) {\n    std::cerr &lt;&lt; \"Format error: \" &lt;&lt; e.what() &lt;&lt; '\\n';\n}<\/pre>\n\n\n\n<p>std::format\u306f\u578b\u5b89\u5168\u3067\u4f7f\u3044\u3084\u3059\u3044\u73fe\u4ee3\u7684\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u63d0\u4f9b\u3057\u3001\u5f93\u6765\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u65b9\u6cd5\u3068\u6bd4\u3079\u3066\u591a\u304f\u306e\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u578b\u30c1\u30a7\u30c3\u30af<\/li>\n\n\n\n<li>\u76f4\u611f\u7684\u306a\u69cb\u6587<\/li>\n\n\n\n<li>\u9ad8\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u53ef\u80fd\u6027<\/li>\n\n\n\n<li>\u56fd\u969b\u5316\u5bfe\u5fdc<\/li>\n<\/ul>\n\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u65b0\u3057\u3044\u65b9\u6cd5\u3068\u5f93\u6765\u306e\u65b9\u6cd5\u3092\u8a73\u7d30\u306b\u6bd4\u8f03\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">\u5f93\u6765\u306e\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u624b\u6cd5\u3068\u6bd4\u8f03<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">sprintf\u7cfb\u95a2\u6570\u306e\u7279\u5fb4\u3068\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p>C\u8a00\u8a9e\u7531\u6765\u306esprintf\u7cfb\u95a2\u6570\u306f\u3001\u9577\u5e74\u4f7f\u7528\u3055\u308c\u3066\u304d\u305f\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u624b\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cstdio&gt;\n#include &lt;string&gt;\n\nvoid example_sprintf() {\n    char buffer[100];  \/\/ \u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u3092\u56fa\u5b9a\n    int value = 42;\n    const char* name = \"Alice\";\n\n    \/\/ \u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\n    sprintf(buffer, \"Value: %d, Name: %s\", value, name);\n    \/\/ \u26a0\ufe0f\u5371\u967a: \u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u53ef\u80fd\u6027\n\n    \/\/ \u3088\u308a\u5b89\u5168\u306asnprintf\n    snprintf(buffer, sizeof(buffer), \"Value: %d, Name: %s\", value, name);\n    \/\/ \u2713 \u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u3092\u30c1\u30a7\u30c3\u30af\n\n    \/\/ \u623b\u308a\u5024\u306e\u78ba\u8a8d\u306b\u3088\u308b\u5b89\u5168\u6027\u5411\u4e0a\n    int result = snprintf(buffer, sizeof(buffer), \"Value: %d, Name: %s\", value, name);\n    if (result &lt; 0 || result &gt;= sizeof(buffer)) {\n        \/\/ \u30a8\u30e9\u30fc\u51e6\u7406\n    }\n}<\/pre>\n\n\n\n<p>sprintf\u7cfb\u306e\u554f\u984c\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u30ea\u30b9\u30af<\/li>\n\n\n\n<li>\u578b\u5b89\u5168\u6027\u306e\u6b20\u5982<\/li>\n\n\n\n<li>\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\u5b50\u306e\u30df\u30b9\u30de\u30c3\u30c1<\/li>\n\n\n\n<li>\u62e1\u5f35\u6027\u306e\u4f4e\u3055<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">std::ostream\u3092\u4f7f\u7528\u3057\u305f\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30b9\u30c8\u30ea\u30fc\u30e0\u64cd\u4f5c\u306f\u3001C++\u306e\u6a19\u6e96\u7684\u306a\u5165\u51fa\u529b\u6a5f\u80fd\u3068\u3057\u3066\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;sstream&gt;\n#include &lt;iomanip&gt;\n\nvoid example_stream() {\n    std::ostringstream oss;\n    double value = 3.14159;\n\n    \/\/ \u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\n    oss &lt;&lt; \"Value: \" &lt;&lt; value;\n\n    \/\/ \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u5236\u5fa1\n    oss.precision(2);\n    oss &lt;&lt; std::fixed;\n    oss &lt;&lt; \"Fixed: \" &lt;&lt; value &lt;&lt; \"\\n\";\n\n    \/\/ \u5e45\u3068\u57cb\u3081\u6587\u5b57\u306e\u6307\u5b9a\n    oss &lt;&lt; std::setw(10) &lt;&lt; std::setfill('0') &lt;&lt; value &lt;&lt; \"\\n\";\n\n    \/\/ 16\u9032\u6570\u8868\u793a\n    oss &lt;&lt; std::hex &lt;&lt; std::uppercase;\n    oss &lt;&lt; \"Hex: 0x\" &lt;&lt; 255 &lt;&lt; \"\\n\";\n\n    std::string result = oss.str();\n}<\/pre>\n\n\n\n<p>\u30b9\u30c8\u30ea\u30fc\u30e0\u64cd\u4f5c\u306e\u7279\u5fb4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u578b\u5b89\u5168\u6027\u304c\u9ad8\u3044<\/li>\n\n\n\n<li>\u30c1\u30a7\u30fc\u30f3\u64cd\u4f5c\u304c\u53ef\u80fd<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u5b89\u5168\u6027\u304c\u4fdd\u8a3c\u3055\u308c\u308b<\/li>\n\n\n\n<li>\u64cd\u4f5c\u304c\u76f4\u611f\u7684\u3067\u306a\u3044\u5834\u5408\u304c\u3042\u308b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">Boost.Format\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u6d3b\u7528\u6cd5<\/h3>\n\n\n\n<p>Boost.Format\u306f\u3001\u3088\u308a\u67d4\u8edf\u306a\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u63d0\u4f9b\u3059\u308b\u5916\u90e8\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;boost\/format.hpp&gt;\n\nvoid example_boost_format() {\n    int age = 25;\n    std::string name = \"Bob\";\n\n    \/\/ \u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\n    std::string result = boost::str(\n        boost::format(\"Name: %1%, Age: %2%\") % name % age\n    );\n\n    \/\/ \u4f4d\u7f6e\u6307\u5b9a\u5b50\u306e\u518d\u5229\u7528\n    result = boost::str(\n        boost::format(\"Name: %1%, %1% is %2% years old\") % name % age\n    );\n\n    \/\/ \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6307\u5b9a\n    result = boost::str(\n        boost::format(\"Value: %|10d|\") % 42  \/\/ 10\u6587\u5b57\u5e45\u3067\u53f3\u5bc4\u305b\n    );\n\n    try {\n        \/\/ \u30a8\u30e9\u30fc\u51e6\u7406\n        boost::format fmt(\"Invalid: %1% %2%\");\n        fmt % 42; \/\/ \u5f15\u6570\u4e0d\u8db3\n        result = boost::str(fmt);\n    } catch (const boost::io::too_few_args&amp; e) {\n        \/\/ \u30a8\u30e9\u30fc\u51e6\u7406\n    }\n}<\/pre>\n\n\n\n<p>\u5404\u624b\u6cd5\u306e\u6bd4\u8f03\u8868\uff1a<\/p>\n\n\n<div id=\"id-92e7cbcd-324d-4afe-a160-61719b46aca7\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6a5f\u80fd<\/th><th>sprintf<\/th><th>std::ostream<\/th><th>Boost.Format<\/th><th>std::format<\/th><\/tr><\/thead><tbody><tr><td>\u578b\u5b89\u5168\u6027<\/td><td>\u00d7<\/td><td>\u25cb<\/td><td>\u25cb<\/td><td>\u25cb<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u5b89\u5168\u6027<\/td><td>\u00d7<\/td><td>\u25cb<\/td><td>\u25cb<\/td><td>\u25cb<\/td><\/tr><tr><td>\u4f7f\u3044\u3084\u3059\u3055<\/td><td>\u25b3<\/td><td>\u25b3<\/td><td>\u25cb<\/td><td>\u25ce<\/td><\/tr><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u25ce<\/td><td>\u25b3<\/td><td>\u00d7<\/td><td>\u25cb<\/td><\/tr><tr><td>\u62e1\u5f35\u6027<\/td><td>\u00d7<\/td><td>\u25cb<\/td><td>\u25cb<\/td><td>\u25ce<\/td><\/tr><tr><td>\u30a8\u30e9\u30fc\u51e6\u7406<\/td><td>\u25b3<\/td><td>\u25cb<\/td><td>\u25cb<\/td><td>\u25cb<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u4f7f\u7528\u30b7\u30fc\u30f3\u5225\u306e\u63a8\u5968\u624b\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u3068\u306e\u4e92\u63db\u6027\u304c\u5fc5\u8981\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sprintf\u7cfb\uff08\u305f\u3060\u3057\u3001snprintf\u3092\u4f7f\u7528\uff09<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5358\u7d14\u306a\u6587\u5b57\u5217\u7d50\u5408\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>std::ostream\u307e\u305f\u306fstd::format<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u8907\u96d1\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u8981\u4ef6\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>std::format\uff08C++20\u4ee5\u964d\uff09<\/li>\n\n\n\n<li>Boost.Format\uff08C++20\u672a\u6e80\uff09<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u5834\u9762\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>std::format<\/li>\n\n\n\n<li>sprintf\uff08\u5341\u5206\u306a\u6ce8\u610f\u3092\u6255\u3048\u308b\u5834\u5408\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u624b\u6cd5\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u52b9\u7387\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-11\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u6700\u9069\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">\u5404\u624b\u6cd5\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c\u3068\u6bd4\u8f03<\/h3>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5404\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u624b\u6cd5\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6e2c\u5b9a\u3057\u307e\u3057\u305f\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;benchmark\/benchmark.h&gt;\n#include &lt;format&gt;\n#include &lt;sstream&gt;\n#include &lt;boost\/format.hpp&gt;\n\n\/\/ \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7528\u306e\u95a2\u6570\nstatic void BM_Printf(benchmark::State&amp; state) {\n    char buffer[256];\n    const int value = 42;\n    const char* str = \"test\";\n    for (auto _ : state) {\n        snprintf(buffer, sizeof(buffer), \"Int: %d, Str: %s\", value, str);\n        benchmark::DoNotOptimize(buffer);\n    }\n}\n\nstatic void BM_Format(benchmark::State&amp; state) {\n    const int value = 42;\n    const std::string str = \"test\";\n    for (auto _ : state) {\n        auto result = std::format(\"Int: {}, Str: {}\", value, str);\n        benchmark::DoNotOptimize(result);\n    }\n}\n\n\/\/ \u4ed6\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u95a2\u6570\u3082\u540c\u69d8\u306b\u5b9f\u88c5...<\/pre>\n\n\n\n<p>\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c\uff08\u76f8\u5bfe\u7684\u306a\u5b9f\u884c\u6642\u9593\uff09\uff1a<\/p>\n\n\n<div id=\"id-3fa15005-ad55-4dcf-8754-395efe5b8cf2\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u624b\u6cd5<\/th><th>\u5b9f\u884c\u6642\u9593\uff08\u76f8\u5bfe\u5024\uff09<\/th><th>\u30e1\u30e2\u30ea\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u56de\u6570<\/th><\/tr><\/thead><tbody><tr><td>sprintf<\/td><td>1.0<\/td><td>0<\/td><\/tr><tr><td>std::format<\/td><td>1.2<\/td><td>1<\/td><\/tr><tr><td>std::ostringstream<\/td><td>2.5<\/td><td>2-3<\/td><\/tr><tr><td>boost::format<\/td><td>4.0<\/td><td>3-4<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30e1\u30e2\u30ea\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8003\u616e\u3057\u305f\u6700\u3082\u91cd\u8981\u306a\u653b\u7565\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u5217\u30ea\u30b6\u30fc\u30d6\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=\"\">\/\/ \u4e8b\u524d\u306b\u5fc5\u8981\u306a\u30b5\u30a4\u30ba\u3092\u78ba\u4fdd\nstd::string optimized_format(const std::string&amp; name, int value) {\n    \/\/ \u5fc5\u8981\u306a\u30b5\u30a4\u30ba\u3092\u8a08\u7b97\n    size_t required_size = name.length() + 20; \/\/ \u6570\u5024\u3068\u8ffd\u52a0\u30c6\u30ad\u30b9\u30c8\u7528\n    std::string result;\n    result.reserve(required_size);\n\n    \/\/ \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u5b9f\u884c\n    result = std::format(\"Name: {}, Value: {}\", name, value);\n    return result;\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u9759\u7684\u30d0\u30c3\u30d5\u30a1\u306e\u5229\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=\"\">class FastFormatter {\nprivate:\n    static constexpr size_t BUFFER_SIZE = 1024;\n    char buffer_[BUFFER_SIZE];\n\npublic:\n    std::string_view format(const char* fmt, ...) {\n        va_list args;\n        va_start(args, fmt);\n        int result = vsnprintf(buffer_, BUFFER_SIZE, fmt, args);\n        va_end(args);\n\n        if (result &lt; 0 || result &gt;= BUFFER_SIZE) {\n            return \"Error: Buffer overflow\";\n        }\n\n        return std::string_view(buffer_, result);\n    }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u30d7\u30fc\u30eb\/\u30a2\u30ea\u30fc\u30ca\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;memory_resource&gt;\n\nvoid optimized_multiple_formats() {\n    \/\/ \u56fa\u5b9a\u30b5\u30a4\u30ba\u306e\u30e1\u30e2\u30ea\u30d7\u30fc\u30eb\n    char buffer[4096];\n    std::pmr::monotonic_buffer_resource pool{buffer, sizeof(buffer)};\n    std::pmr::string result{&amp;pool};\n\n    \/\/ \u30e1\u30e2\u30ea\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u305f\u51e6\u7406\n    for (int i = 0; i &lt; 100; ++i) {\n        result = std::format(\"Value: {}\", i);\n        \/\/ \u30d7\u30fc\u30eb\u5185\u3067\u30e1\u30e2\u30ea\u518d\u5229\u7528\n    }\n}<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u6700\u5c0f\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6587\u5b57\u5217\u306e\u4e8b\u524d\u30ea\u30b6\u30fc\u30d6<\/li>\n\n\n\n<li>\u9759\u7684\u30d0\u30c3\u30d5\u30a1\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u30d7\u30fc\u30eb\u306e\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9069\u5207\u306a\u624b\u6cd5\u306e\u9078\u629e<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5c0f\u898f\u6a21\u306a\u56fa\u5b9a\u6587\u5b57\u5217\uff1asprintf<\/li>\n\n\n\n<li>\u52d5\u7684\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff1astd::format<\/li>\n\n\n\n<li>\u5927\u91cf\u306e\u9023\u7d50\uff1astring_view\u306e\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>constexpr\u6587\u5b57\u5217\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30bf\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5b9f\u884c\u6642\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30db\u30c3\u30c8\u30d1\u30b9\u3067\u306e\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u56de\u907f<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u306a\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30b9\u30ec\u30c3\u30c9\u30ed\u30fc\u30ab\u30eb\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u6d3b\u7528<\/li>\n<\/ul>\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\u3001\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u51e6\u7406\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-14\">\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u30b7\u30fc\u30f3\u3068\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u30ed\u30b0\u51fa\u529b\u3067\u306e\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30ed\u30b0\u51fa\u529b\u306f\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6700\u3082\u4e00\u822c\u7684\u306a\u4f7f\u7528\u30b7\u30fc\u30f3\u306e\u4e00\u3064\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;format&gt;\n#include &lt;chrono&gt;\n#include &lt;mutex&gt;\n\nclass Logger {\npublic:\n    enum class Level { DEBUG, INFO, WARNING, ERROR };\n\nprivate:\n    std::mutex mutex_;\n    std::ofstream file_;\n\n    static constexpr const char* level_strings[] = {\n        \"DEBUG\", \"INFO\", \"WARNING\", \"ERROR\"\n    };\n\npublic:\n    template&lt;typename... Args&gt;\n    void log(Level level, std::string_view fmt, Args&amp;&amp;... args) {\n        auto now = std::chrono::system_clock::now();\n        auto timestamp = std::chrono::floor&lt;std::chrono::milliseconds&gt;(now);\n\n        \/\/ \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6587\u5b57\u5217\u3092\u4e8b\u524d\u306b\u69cb\u7bc9\n        auto message = std::format(fmt, std::forward&lt;Args&gt;(args)...);\n\n        \/\/ \u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u66f8\u304d\u8fbc\u307f\n        std::lock_guard&lt;std::mutex&gt; lock(mutex_);\n        file_ &lt;&lt; std::format(\"[{}] {}: {}\\n\",\n            timestamp, level_strings[static_cast&lt;int&gt;(level)], message);\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nLogger logger;\nlogger.log(Logger::Level::INFO, \"User {} logged in from {}\", username, ip_address);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u5927\u91cf\u306e\u6587\u5b57\u5217\u51e6\u7406\u3092\u884c\u3046\u969b\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b\u5834\u5408\u306e\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class BulkFormatter {\nprivate:\n    struct FormattingTask {\n        std::string format_str;\n        std::vector&lt;std::string&gt; args;\n    };\n\n    static constexpr size_t BATCH_SIZE = 1000;\n    std::vector&lt;FormattingTask&gt; tasks_;\n    std::string result_;\n\npublic:\n    void add_task(std::string_view fmt, std::vector&lt;std::string&gt; args) {\n        tasks_.push_back({std::string(fmt), std::move(args)});\n\n        if (tasks_.size() &gt;= BATCH_SIZE) {\n            flush();\n        }\n    }\n\n    void flush() {\n        \/\/ \u5fc5\u8981\u306a\u30b5\u30a4\u30ba\u3092\u4e88\u6e2c\u3057\u3066\u4e8b\u524d\u78ba\u4fdd\n        size_t estimated_size = 0;\n        for (const auto&amp; task : tasks_) {\n            estimated_size += task.format_str.length() + 50;  \/\/ \u6982\u7b97\n        }\n        result_.reserve(result_.size() + estimated_size);\n\n        \/\/ \u30d0\u30c3\u30c1\u51e6\u7406\n        for (const auto&amp; task : tasks_) {\n            try {\n                result_ += std::vformat(task.format_str, \n                    std::make_format_args(task.args...));\n            } catch (const std::format_error&amp; e) {\n                \/\/ \u30a8\u30e9\u30fc\u51e6\u7406\n            }\n        }\n\n        tasks_.clear();\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u5b89\u5168\u306a\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ThreadSafeFormatter {\nprivate:\n    \/\/ \u30b9\u30ec\u30c3\u30c9\u30ed\u30fc\u30ab\u30eb\u30d0\u30c3\u30d5\u30a1\n    static thread_local std::string buffer_;\n    static thread_local char fixed_buffer_[4096];\n\n    std::mutex output_mutex_;\n    std::ofstream output_file_;\n\npublic:\n    template&lt;typename... Args&gt;\n    std::string_view format_thread_safe(std::string_view fmt, Args&amp;&amp;... args) {\n        try {\n            \/\/ \u30b9\u30ec\u30c3\u30c9\u30ed\u30fc\u30ab\u30eb\u30d0\u30c3\u30d5\u30a1\u3092\u4f7f\u7528\n            buffer_ = std::format(fmt, std::forward&lt;Args&gt;(args)...);\n            return buffer_;\n        } catch (const std::format_error&amp; e) {\n            return \"Format Error\";\n        }\n    }\n\n    template&lt;typename... Args&gt;\n    void format_and_write(std::string_view fmt, Args&amp;&amp;... args) {\n        auto formatted = format_thread_safe(fmt, std::forward&lt;Args&gt;(args)...);\n\n        \/\/ \u51fa\u529b\u6642\u306e\u307f\u30ed\u30c3\u30af\n        std::lock_guard&lt;std::mutex&gt; lock(output_mutex_);\n        output_file_ &lt;&lt; formatted &lt;&lt; std::endl;\n    }\n};<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u5225\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30ed\u30b0\u51fa\u529b\u30d1\u30bf\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406<\/li>\n\n\n\n<li>\u30ed\u30b0\u30ec\u30d9\u30eb\u306e\u9069\u5207\u306a\u7ba1\u7406<\/li>\n\n\n\n<li>\u30d0\u30c3\u30d5\u30a1\u30ea\u30f3\u30b0\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u975e\u540c\u671f\u66f8\u304d\u8fbc\u307f\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406\u30d1\u30bf\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4e8b\u524d\u78ba\u4fdd<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u56de\u5fa9\u30e1\u30ab\u30cb\u30ba\u30e0<\/li>\n\n\n\n<li>\u30d7\u30ed\u30b0\u30ec\u30b9\u5831\u544a\u6a5f\u80fd<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b9\u30ec\u30c3\u30c9\u30ed\u30fc\u30ab\u30eb\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u6700\u5c0f\u9650\u306e\u30ed\u30c3\u30af\u7bc4\u56f2<\/li>\n\n\n\n<li>\u30ed\u30c3\u30af\u30d5\u30ea\u30fc\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u9069\u7528<\/li>\n\n\n\n<li>\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u9632\u6b62\u7b56<\/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><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=\"\">   try {\n       auto result = std::format(fmt, args...);\n   } catch (const std::format_error&amp; e) {\n       \/\/ \u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u51e6\u7406\n       return fallback_format(fmt, args...);\n   }<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30e2\u30cb\u30bf\u30ea\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=\"\">   auto start = std::chrono::high_resolution_clock::now();\n   \/\/ \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u51e6\u7406\n   auto end = std::chrono::high_resolution_clock::now();\n   auto duration = std::chrono::duration_cast&lt;std::chrono::microseconds&gt;\n                  (end - start).count();<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u6587\u5b57\u5217\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u51e6\u7406\u3092\u5b9f\u73fe\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-2185","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\/2185","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=2185"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2185\/revisions"}],"predecessor-version":[{"id":2186,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2185\/revisions\/2186"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2185"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2185"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2185"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}