{"id":1672,"date":"2025-03-24T08:50:10","date_gmt":"2025-03-23T23:50:10","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1672"},"modified":"2025-03-24T08:50:10","modified_gmt":"2025-03-23T23:50:10","slug":"c%e3%81%aeenum%e3%82%92%e5%ae%8c%e5%85%a8%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%ef%bc%81%e7%8f%be%e5%a0%b4%e3%81%a7%e4%bd%bf%e3%81%88%e3%82%8b%e5%ae%9f%e8%b7%b5%e7%9a%84%e3%81%aa7%e3%81%a4%e3%81%ae","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1672","title":{"rendered":"C++\u306eenum\u3092\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\uff01\u73fe\u5834\u3067\u4f7f\u3048\u308b\u5b9f\u8df5\u7684\u306a7\u3064\u306e\u6280\u6cd5"},"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\">enum\u3068\u306f\uff1f\u30e2\u30c0\u30f3C++\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u305f\u3081\u306e\u5b8c\u5168\u30ac\u30a4\u30c9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">enum\u306e\u57fa\u672c\u6982\u5ff5\u3068\u4f7f\u7528\u76ee\u7684\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-3\">\u306a\u305cenum class\u304c\u63a8\u5968\u3055\u308c\u308b\u306e\u304b\uff1f<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-6\">enum\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-7\">\u5f93\u6765\u306eenum\u306e\u5b9a\u7fa9\u3068\u4f7f\u7528\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-10\">enum class\u306e\u5b9a\u7fa9\u3068\u4f7f\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">\u30b9\u30b3\u30fc\u30d7\u3068\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-16\">\u5b9f\u8df5\u7684\u306aenum\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u30d3\u30c3\u30c8\u6f14\u7b97\u3068\u30d5\u30e9\u30b0\u3068\u3057\u3066\u306e\u4f7f\u7528\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-19\">switch\u6587\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-21\">\u6587\u5b57\u5217\u5909\u63db\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-24\">enum\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-25\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-28\">\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u6700\u9069\u5316\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-32\">enum\u3092\u4f7f\u7528\u3057\u305f\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-33\">\u30b9\u30c6\u30fc\u30c8\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-35\">\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u4f7f\u7528\u4f8b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-38\">enum\u306b\u307e\u3064\u308f\u308b\u4e00\u822c\u7684\u306a\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-39\">\u578b\u5b89\u5168\u6027\u306b\u95a2\u3059\u308b\u8ab2\u984c\u3068\u5bfe\u7b56<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-42\">\u7d99\u627f\u6642\u306e\u554f\u984c\u3068\u89e3\u6c7a\u30a2\u30d7\u30ed\u30fc\u30c1<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-45\">\u30e2\u30c0\u30f3C++\u3067\u306eenum\u6d3b\u7528\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-46\">\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04\u3068\u30b9\u30bf\u30a4\u30eb\u30ac\u30a4\u30c9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-50\">\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u3092\u8003\u616e\u3057\u305f\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\">enum\u3068\u306f\uff1f\u30e2\u30c0\u30f3C++\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u305f\u3081\u306e\u5b8c\u5168\u30ac\u30a4\u30c9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">enum\u306e\u57fa\u672c\u6982\u5ff5\u3068\u4f7f\u7528\u76ee\u7684\u3092\u7406\u89e3\u3059\u308b<\/h3>\n\n\n\n<p>\u5217\u6319\u578b\uff08enum\uff09\u306f\u3001C++\u306b\u304a\u3044\u3066\u540d\u524d\u4ed8\u304d\u306e\u5b9a\u6570\u5024\u306e\u30bb\u30c3\u30c8\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306e\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u5185\u3067\u4f7f\u7528\u3059\u308b\u5b9a\u6570\u5024\u306b\u610f\u5473\u306e\u3042\u308b\u540d\u524d\u3092\u4ed8\u3051\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u4fdd\u5b88\u6027\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-2\">enum\u306e\u4e3b\u306a\u7528\u9014<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u72b6\u614b\u7ba1\u7406<\/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=\"\">enum Status {\n    READY,      \/\/ 0\n    RUNNING,    \/\/ 1\n    PAUSED,     \/\/ 2\n    STOPPED     \/\/ 3\n};\n\nStatus currentStatus = READY;\nif (currentStatus == RUNNING) {\n    \/\/ \u5b9f\u884c\u4e2d\u306e\u51e6\u7406\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u30aa\u30d7\u30b7\u30e7\u30f3\u8a2d\u5b9a<\/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=\"\">enum DisplayMode {\n    WINDOWED = 1,\n    FULLSCREEN = 2,\n    BORDERLESS = 3\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u30d5\u30e9\u30b0\u7ba1\u7406<\/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=\"\">enum FilePermission {\n    READ = 1,        \/\/ 0001\n    WRITE = 2,       \/\/ 0010\n    EXECUTE = 4,     \/\/ 0100\n    ALL = 7          \/\/ 0111\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">\u306a\u305cenum class\u304c\u63a8\u5968\u3055\u308c\u308b\u306e\u304b\uff1f<\/h3>\n\n\n\n<p>C++11\u3067\u5c0e\u5165\u3055\u308c\u305f<code>enum class<\/code>\uff08\u30b9\u30b3\u30fc\u30d7\u4ed8\u304d\u5217\u6319\u578b\uff09\u306f\u3001\u5f93\u6765\u306e<code>enum<\/code>\u306e\u554f\u984c\u70b9\u3092\u89e3\u6c7a\u3057\u3001\u3088\u308a\u5b89\u5168\u3067\u30e2\u30c0\u30f3\u306a\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-4\">enum class\u306e\u5229\u70b9<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u578b\u5b89\u5168\u6027\u306e\u5411\u4e0a<\/strong><\/li>\n<\/ol>\n\n\n\n<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=\"\">enum class Color {\n    RED,\n    GREEN,\n    BLUE\n};\n\n\/\/ \u660e\u793a\u7684\u306a\u578b\u6307\u5b9a\u304c\u5fc5\u8981\nColor c = Color::RED;  \/\/ OK\nint n = Color::RED;    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u540d\u524d\u7a7a\u9593\u306e\u6c5a\u67d3\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=\"\">\/\/ \u5f93\u6765\u306eenum\nenum Status { READY, RUNNING };\nenum State { READY, ACTIVE };  \/\/ \u30a8\u30e9\u30fc: READY\u304c\u91cd\u8907\n\n\/\/ enum class\nenum class Status { READY, RUNNING };\nenum class State { READY, ACTIVE };   \/\/ OK: \u30b9\u30b3\u30fc\u30d7\u304c\u7570\u306a\u308b<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u578b\u5909\u63db\u306e\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=\"\">enum class Flags : uint8_t {  \/\/ \u660e\u793a\u7684\u306a\u57fa\u5e95\u578b\u6307\u5b9a\n    Option1 = 0x01,\n    Option2 = 0x02,\n    Option3 = 0x04\n};\n\n\/\/ \u660e\u793a\u7684\u306a\u578b\u5909\u63db\u304c\u5fc5\u8981\nuint8_t flag = static_cast&lt;uint8_t&gt;(Flags::Option1);<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>IDE\u652f\u63f4\u306e\u5411\u4e0a<\/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=\"\">enum class Direction {\n    UP,\n    DOWN,\n    LEFT,\n    RIGHT\n};\n\nDirection d = Direction::  \/\/ \u3053\u3053\u3067IDE\u304c\u6709\u52b9\u306a\u5024\u3092\u63d0\u6848<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-5\">enum class\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/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=\"\">enum class SmallEnum : int8_t {  \/\/ 1\u30d0\u30a4\u30c8\n    A, B, C\n};\n\nenum class LargeEnum : int32_t {  \/\/ 4\u30d0\u30a4\u30c8\n    A, B, C\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6587\u5b57\u5217\u5909\u63db\u306e\u5fc5\u8981\u6027<\/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=\"\">enum class LogLevel {\n    DEBUG,\n    INFO,\n    WARNING,\n    ERROR\n};\n\n\/\/ \u6587\u5b57\u5217\u5909\u63db\u95a2\u6570\u306e\u5b9f\u88c5\u304c\u5fc5\u8981\nstd::string toString(LogLevel level) {\n    switch (level) {\n        case LogLevel::DEBUG: return \"DEBUG\";\n        case LogLevel::INFO: return \"INFO\";\n        case LogLevel::WARNING: return \"WARNING\";\n        case LogLevel::ERROR: return \"ERROR\";\n        default: return \"UNKNOWN\";\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001<code>enum class<\/code>\u306e\u4f7f\u7528\u306f\u73fe\u4ee3\u306eC++\u958b\u767a\u306b\u304a\u3044\u3066\u63a8\u5968\u3055\u308c\u308b\u624b\u6cd5\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u578b\u5b89\u5168\u6027\u3001\u540d\u524d\u7a7a\u9593\u306e\u5236\u5fa1\u3001\u660e\u793a\u7684\u306a\u578b\u5909\u63db\u306e\u8981\u6c42\u306a\u3069\u306e\u7279\u5fb4\u306b\u3088\u308a\u3001\u3088\u308a\u5805\u7262\u306a\u30b3\u30fc\u30c9\u306e\u4f5c\u6210\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u6a5f\u80fd\u3092\u3088\u308a\u8a73\u3057\u304f\u63a2\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-6\">enum\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u5f93\u6765\u306eenum\u306e\u5b9a\u7fa9\u3068\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u5f93\u6765\u306e\u5217\u6319\u578b\uff08unscoped enum\uff09\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u3067\u76f4\u611f\u7684\u306a\u4f7f\u3044\u65b9\u304c\u3067\u304d\u308b\u4e00\u65b9\u3067\u3001\u3044\u304f\u3064\u304b\u306e\u6ce8\u610f\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-8\">\u57fa\u672c\u7684\u306a\u5b9a\u7fa9\u65b9\u6cd5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum DayOfWeek {\n    SUNDAY = 0,    \/\/ \u660e\u793a\u7684\u306b\u5024\u3092\u6307\u5b9a\n    MONDAY,        \/\/ 1\n    TUESDAY,       \/\/ 2\n    WEDNESDAY,     \/\/ 3\n    THURSDAY,      \/\/ 4\n    FRIDAY,        \/\/ 5\n    SATURDAY       \/\/ 6\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nDayOfWeek today = MONDAY;\nif (today == FRIDAY) {\n    std::cout &lt;&lt; \"\u9031\u672b\u304c\u8fd1\u3044\u3067\u3059\" &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-9\">\u6697\u9ed9\u306e\u578b\u5909\u63db<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum Color {\n    RED,\n    GREEN,\n    BLUE\n};\n\nColor c = RED;\nint colorValue = c;      \/\/ \u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u53ef\u80fd\uff08\u3053\u308c\u304c\u554f\u984c\u3068\u306a\u308b\u3053\u3068\u3082\uff09\nbool isRed = (c == 0);   \/\/ \u6570\u5024\u3068\u306e\u76f4\u63a5\u6bd4\u8f03\u304c\u53ef\u80fd<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">enum class\u306e\u5b9a\u7fa9\u3068\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30e2\u30c0\u30f3C++\u3067\u306e\u63a8\u5968\u3055\u308c\u308b\u65b9\u6cd5\u3068\u3057\u3066\u3001enum class\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3092\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-11\">\u57fa\u672c\u7684\u306a\u5b9a\u7fa9\u65b9\u6cd5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class Season : uint8_t {  \/\/ \u57fa\u5e95\u578b\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\n    Spring,\n    Summer,\n    Autumn,\n    Winter\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nSeason current = Season::Summer;\nif (current == Season::Summer) {\n    std::cout &lt;&lt; \"\u590f\u5b63\u306e\u51e6\u7406\u3092\u5b9f\u884c\" &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-12\">\u30e1\u30f3\u30d0\u30a2\u30af\u30bb\u30b9\u3068\u578b\u5909\u63db<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class HttpStatus : uint16_t {\n    OK = 200,\n    NotFound = 404,\n    ServerError = 500\n};\n\nHttpStatus status = HttpStatus::OK;\n\/\/ int code = status;                    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\nint code = static_cast&lt;uint16_t&gt;(status); \/\/ \u660e\u793a\u7684\u306a\u578b\u5909\u63db\u304c\u5fc5\u8981<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30b9\u30b3\u30fc\u30d7\u3068\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b<\/h3>\n\n\n\n<p>enum\u3068enum class\u306e\u6700\u3082\u91cd\u8981\u306a\u9055\u3044\u306e\u4e00\u3064\u306f\u3001\u30b9\u30b3\u30fc\u30d7\u3068\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u306e\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-14\">\u5f93\u6765\u306eenum\u306e\u30b9\u30b3\u30fc\u30d7<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30b3\u30fc\u30d7\u306e\u6c5a\u67d3\u306e\u4f8b\nenum PlayerState { IDLE, MOVING };\nenum AnimationState { IDLE, PLAYING };  \/\/ \u30a8\u30e9\u30fc: IDLE\u304c\u91cd\u8907\n\n\/\/ \u540d\u524d\u7a7a\u9593\u306b\u3088\u308b\u56de\u907f\u7b56\nnamespace Player {\n    enum State { IDLE, MOVING };\n}\nnamespace Animation {\n    enum State { IDLE, PLAYING };\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nPlayer::State playerState = Player::IDLE;\nAnimation::State animState = Animation::PLAYING;<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-15\">enum class\u306e\u30b9\u30b3\u30fc\u30d7\u5236\u5fa1<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class PlayerState {\n    Idle,\n    Moving,\n    Jumping,\n    Falling\n};\n\nenum class AnimationState {\n    Idle,      \/\/ \u554f\u984c\u306a\u3057\n    Playing,\n    Paused\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nPlayerState state = PlayerState::Idle;\nAnimationState anim = AnimationState::Playing;\n\n\/\/ switch\u6587\u3067\u306e\u4f7f\u7528\nvoid handlePlayerState(PlayerState state) {\n    switch (state) {\n        case PlayerState::Idle:\n            \/\/ \u30a2\u30a4\u30c9\u30eb\u72b6\u614b\u306e\u51e6\u7406\n            break;\n        case PlayerState::Moving:\n            \/\/ \u79fb\u52d5\u72b6\u614b\u306e\u51e6\u7406\n            break;\n        case PlayerState::Jumping:\n        case PlayerState::Falling:\n            \/\/ \u7a7a\u4e2d\u72b6\u614b\u306e\u51e6\u7406\n            break;\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001enum class\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u540d\u524d\u306e\u885d\u7a81\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b<\/li>\n\n\n\n<li>\u610f\u56f3\u3057\u306a\u3044\u578b\u5909\u63db\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u3088\u308a\u660e\u78ba\u306b\u306a\u308b<\/li>\n\n\n\n<li>IDE\u306e\u30b5\u30dd\u30fc\u30c8\u304c\u5f37\u5316\u3055\u308c\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u8e0f\u307e\u3048\u305f\u4e0a\u3067\u3001\u3088\u308a\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">\u5b9f\u8df5\u7684\u306aenum\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u30d3\u30c3\u30c8\u6f14\u7b97\u3068\u30d5\u30e9\u30b0\u3068\u3057\u3066\u306e\u4f7f\u7528\u6cd5<\/h3>\n\n\n\n<p>\u30d3\u30c3\u30c8\u30d5\u30e9\u30b0\u3068\u3057\u3066\u306eenum\u306e\u4f7f\u7528\u306f\u3001\u8907\u6570\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3059\u308b\u5f37\u529b\u306a\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-18\">\u30d5\u30e9\u30b0\u306e\u5b9a\u7fa9\u3068\u64cd\u4f5c<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class WindowFlags : uint32_t {\n    None     = 0x00,      \/\/ 0000 0000\n    Visible  = 0x01,      \/\/ 0000 0001\n    Resizable= 0x02,      \/\/ 0000 0010\n    Modal    = 0x04,      \/\/ 0000 0100\n    Fullscreen = 0x08     \/\/ 0000 1000\n};\n\n\/\/ \u30d3\u30c3\u30c8\u6f14\u7b97\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306e\u6f14\u7b97\u5b50\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\ninline WindowFlags operator|(WindowFlags a, WindowFlags b) {\n    return static_cast&lt;WindowFlags&gt;(\n        static_cast&lt;uint32_t&gt;(a) | static_cast&lt;uint32_t&gt;(b)\n    );\n}\n\ninline WindowFlags operator&amp;(WindowFlags a, WindowFlags b) {\n    return static_cast&lt;WindowFlags&gt;(\n        static_cast&lt;uint32_t&gt;(a) &amp; static_cast&lt;uint32_t&gt;(b)\n    );\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nclass Window {\n    WindowFlags flags;\npublic:\n    void setFlags(WindowFlags newFlags) { flags = newFlags; }\n    bool hasFlag(WindowFlags flag) {\n        return static_cast&lt;uint32_t&gt;(flags &amp; flag) != 0;\n    }\n};\n\n\/\/ \u8907\u6570\u30d5\u30e9\u30b0\u306e\u7d44\u307f\u5408\u308f\u305b\nWindow window;\nwindow.setFlags(WindowFlags::Visible | WindowFlags::Resizable);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">switch\u6587\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u65b9<\/h3>\n\n\n\n<p>enum\u3068switch\u6587\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u3001\u72b6\u614b\u7ba1\u7406\u306e\u57fa\u672c\u30d1\u30bf\u30fc\u30f3\u3068\u3057\u3066\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-20\">\u52b9\u7387\u7684\u306aswitch\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class ErrorCode {\n    Success,\n    FileNotFound,\n    AccessDenied,\n    NetworkError,\n    Unknown\n};\n\nstd::string handleError(ErrorCode error) {\n    switch (error) {\n        case ErrorCode::Success:\n            return \"\u51e6\u7406\u304c\u6210\u529f\u3057\u307e\u3057\u305f\";\n\n        case ErrorCode::FileNotFound:\n            return \"\u30d5\u30a1\u30a4\u30eb\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\";\n\n        case ErrorCode::AccessDenied:\n            return \"\u30a2\u30af\u30bb\u30b9\u304c\u62d2\u5426\u3055\u308c\u307e\u3057\u305f\";\n\n        case ErrorCode::NetworkError:\n            return \"\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\";\n\n        case ErrorCode::Unknown:\n        default:\n            return \"\u4e0d\u660e\u306a\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\";\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u6587\u5b57\u5217\u5909\u63db\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>enum\u3068\u6587\u5b57\u5217\u306e\u76f8\u4e92\u5909\u63db\u306f\u983b\u7e41\u306b\u5fc5\u8981\u3068\u306a\u308b\u6a5f\u80fd\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-22\">\u6587\u5b57\u5217\u5909\u63db\u30c6\u30fc\u30d6\u30eb\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class LogLevel {\n    Debug,\n    Info,\n    Warning,\n    Error,\n    Critical\n};\n\n\/\/ \u6587\u5b57\u5217\u5909\u63db\u30c6\u30fc\u30d6\u30eb\nstatic const std::unordered_map&lt;LogLevel, std::string&gt; LogLevelStrings = {\n    {LogLevel::Debug, \"DEBUG\"},\n    {LogLevel::Info, \"INFO\"},\n    {LogLevel::Warning, \"WARNING\"},\n    {LogLevel::Error, \"ERROR\"},\n    {LogLevel::Critical, \"CRITICAL\"}\n};\n\n\/\/ enum -&gt; \u6587\u5b57\u5217\nstd::string toString(LogLevel level) {\n    auto it = LogLevelStrings.find(level);\n    return it != LogLevelStrings.end() ? it-&gt;second : \"UNKNOWN\";\n}\n\n\/\/ \u6587\u5b57\u5217 -&gt; enum\nstd::optional&lt;LogLevel&gt; fromString(const std::string&amp; str) {\n    for (const auto&amp; pair : LogLevelStrings) {\n        if (pair.second == str) {\n            return pair.first;\n        }\n    }\n    return std::nullopt;\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-23\">\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">template&lt;typename EnumType&gt;\nclass EnumHelper {\n    static_assert(std::is_enum_v&lt;EnumType&gt;, \"EnumType must be an enumeration type\");\n\npublic:\n    \/\/ constexpr\u95a2\u6570\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u901f\u306a\u6587\u5b57\u5217\u5909\u63db\n    static constexpr std::string_view toString(EnumType value) {\n        switch (value) {\n            case EnumType::Value1: return \"Value1\";\n            case EnumType::Value2: return \"Value2\";\n            \/\/ ... \u4ed6\u306e\u30b1\u30fc\u30b9\n            default: return \"Unknown\";\n        }\n    }\n\n    \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30c1\u30a7\u30c3\u30af\u53ef\u80fd\u306a\u5909\u63db\n    static constexpr bool isValid(EnumType value) {\n        switch (value) {\n            case EnumType::Value1:\n            case EnumType::Value2:\n                return true;\n            default:\n                return false;\n        }\n    }\n};<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001enum\u3092\u3088\u308a\u5f37\u529b\u304b\u3064\u67d4\u8edf\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u6ce8\u610f\u3059\u3079\u304d\u70b9\u3068\u3057\u3066\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d3\u30c3\u30c8\u30d5\u30e9\u30b0\u306e\u4f7f\u7528\u6642\u306f\u3001\u57fa\u5e95\u578b\u306e\u30b5\u30a4\u30ba\u3092\u9069\u5207\u306b\u9078\u629e\u3059\u308b<\/li>\n\n\n\n<li>switch\u6587\u3067\u306f\u3001default\u53e5\u3092\u9069\u5207\u306b\u51e6\u7406\u3059\u308b<\/li>\n\n\n\n<li>\u6587\u5b57\u5217\u5909\u63db\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u8003\u616e\u3059\u308b<\/li>\n\n\n\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u5236\u7d04\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3059\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u6700\u9069\u5316\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-24\">enum\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u6700\u9069\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-25\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u65b9\u6cd5<\/h3>\n\n\n\n<p>enum\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306f\u3001\u7279\u306b\u5927\u898f\u6a21\u306a\u30b7\u30b9\u30c6\u30e0\u3084\u30e1\u30e2\u30ea\u5236\u7d04\u306e\u3042\u308b\u74b0\u5883\u3067\u91cd\u8981\u306a\u8003\u616e\u4e8b\u9805\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-26\">\u57fa\u5e95\u578b\u306e\u6700\u9069\u306a\u9078\u629e<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316\u4f8b\nenum class SmallEnum : uint8_t {  \/\/ 1\u30d0\u30a4\u30c8\n    A, B, C\n};\n\nenum class MediumEnum : uint16_t {  \/\/ 2\u30d0\u30a4\u30c8\n    A, B, C, \/* ... *\/ Z\n};\n\nenum class LargeEnum : uint32_t {  \/\/ 4\u30d0\u30a4\u30c8\n    Value1, Value2, \/* ... *\/ Value1000\n};\n\n\/\/ \u30e1\u30e2\u30ea\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u78ba\u8a8d\nstruct EnumContainer {\n    SmallEnum small;    \/\/ 1\u30d0\u30a4\u30c8\n    MediumEnum medium;  \/\/ 2\u30d0\u30a4\u30c8\n    LargeEnum large;    \/\/ 4\u30d0\u30a4\u30c8\n};\n\nstatic_assert(sizeof(SmallEnum) == 1, \"SmallEnum should be 1 byte\");\nstatic_assert(sizeof(MediumEnum) &lt;= 2, \"MediumEnum should be 2 bytes or less\");<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-27\">\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306e\u6700\u9069\u5316<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u8003\u616e\u3057\u305f\u69cb\u9020\u4f53\u306e\u8a2d\u8a08\nstruct OptimizedStruct {\n    uint32_t id;           \/\/ 4\u30d0\u30a4\u30c8\n    SmallEnum small;       \/\/ 1\u30d0\u30a4\u30c8\n    MediumEnum medium;     \/\/ 2\u30d0\u30a4\u30c8\n    uint8_t padding;       \/\/ 1\u30d0\u30a4\u30c8\uff08\u81ea\u52d5\u30d1\u30c7\u30a3\u30f3\u30b0\uff09\n}; \/\/ \u5408\u8a088\u30d0\u30a4\u30c8\n\nstruct UnoptimizedStruct {\n    uint32_t id;           \/\/ 4\u30d0\u30a4\u30c8\n    uint8_t padding1[4];   \/\/ \u30d1\u30c7\u30a3\u30f3\u30b0\n    SmallEnum small;       \/\/ 1\u30d0\u30a4\u30c8\n    uint8_t padding2[3];   \/\/ \u30d1\u30c7\u30a3\u30f3\u30b0\n    MediumEnum medium;     \/\/ 2\u30d0\u30a4\u30c8\n    uint8_t padding3[2];   \/\/ \u30d1\u30c7\u30a3\u30f3\u30b0\n}; \/\/ \u5408\u8a0816\u30d0\u30a4\u30c8<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-28\">\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u6700\u9069\u5316\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u6700\u9069\u5316\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5b9f\u884c\u6642\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-29\">constexpr enum\u306e\u6d3b\u7528<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class CompileTimeEnum {\n    Value1 = 1,\n    Value2 = Value1 * 2,\n    Value3 = Value2 * 2\n};\n\nconstexpr auto calculateEnumValue() {\n    return static_cast&lt;int&gt;(CompileTimeEnum::Value3);\n}\n\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a08\u7b97\u3055\u308c\u308b\nstatic_assert(calculateEnumValue() == 4, \"Unexpected enum value\");<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-30\">\u30b9\u30a4\u30c3\u30c1\u6587\u306e\u6700\u9069\u5316<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class OptimizedSwitch : uint8_t {\n    Case1, Case2, Case3, Case4\n};\n\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u30b8\u30e3\u30f3\u30d7\u30c6\u30fc\u30d6\u30eb\u3092\u751f\u6210\u3059\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044\nint optimizedFunction(OptimizedSwitch value) {\n    switch (value) {\n        case OptimizedSwitch::Case1: return 1;\n        case OptimizedSwitch::Case2: return 2;\n        case OptimizedSwitch::Case3: return 3;\n        case OptimizedSwitch::Case4: return 4;\n    }\n    return 0;\n}\n\n\/\/ \u975e\u9023\u7d9a\u306a\u5024\u306f\u5206\u5c90\u4e88\u6e2c\u304c\u96e3\u3057\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\nenum class UnoptimizedSwitch : int {\n    Case1 = 1,\n    Case2 = 10,\n    Case3 = 100,\n    Case4 = 1000\n};<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-31\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6e2c\u5b9a\u306e\u4f8b<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;chrono&gt;\n#include &lt;iostream&gt;\n\nenum class FastEnum : uint8_t { A, B, C };\nenum class SlowEnum : int64_t { A = 1000000, B = 2000000, C = 3000000 };\n\ntemplate&lt;typename EnumType&gt;\nvoid measureEnumPerformance() {\n    const int iterations = 10000000;\n    auto start = std::chrono::high_resolution_clock::now();\n\n    EnumType value = EnumType::A;\n    for (int i = 0; i &lt; iterations; ++i) {\n        switch (value) {\n            case EnumType::A: value = EnumType::B; break;\n            case EnumType::B: value = EnumType::C; break;\n            case EnumType::C: value = EnumType::A; break;\n        }\n    }\n\n    auto end = std::chrono::high_resolution_clock::now();\n    auto duration = std::chrono::duration_cast&lt;std::chrono::microseconds&gt;(end - start);\n    std::cout &lt;&lt; \"Execution time: \" &lt;&lt; duration.count() &lt;&lt; \" microseconds\" &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<p>\u6700\u9069\u5316\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u6700\u5c0f\u9650\u306e\u57fa\u5e95\u578b\u3092\u9078\u629e\u3059\u308b<\/li>\n\n\n\n<li>\u69cb\u9020\u4f53\u5185\u3067\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u8003\u616e\u3059\u308b<\/li>\n\n\n\n<li>\u30d1\u30c7\u30a3\u30f3\u30b0\u3092\u610f\u8b58\u3057\u305f\u5909\u6570\u914d\u7f6e\u3092\u884c\u3046<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>constexpr\u3092\u6d3b\u7528\u3057\u3066\u8a08\u7b97\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u884c\u3046<\/li>\n\n\n\n<li>\u9023\u7d9a\u3057\u305f\u5024\u3092\u4f7f\u7528\u3057\u3066\u30b8\u30e3\u30f3\u30d7\u30c6\u30fc\u30d6\u30eb\u306e\u751f\u6210\u3092\u4fc3\u9032\u3059\u308b<\/li>\n\n\n\n<li>\u5206\u5c90\u4e88\u6e2c\u3092\u8003\u616e\u3057\u305f\u5024\u306e\u914d\u7f6e\u3092\u884c\u3046<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a08\u6e2c<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9f\u969b\u306e\u4f7f\u7528\u74b0\u5883\u3067\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u3092\u884c\u3046<\/li>\n\n\n\n<li>\u7570\u306a\u308b\u30b3\u30f3\u30d1\u30a4\u30e9\u3067\u306e\u52d5\u4f5c\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n\n\n\n<li>\u6700\u9069\u5316\u30ec\u30d9\u30eb\u306e\u5f71\u97ff\u3092\u691c\u8a3c\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001enum\u3092\u4f7f\u7528\u3057\u305f\u30b3\u30fc\u30c9\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-32\">enum\u3092\u4f7f\u7528\u3057\u305f\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-33\">\u30b9\u30c6\u30fc\u30c8\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u6d3b\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30b9\u30c6\u30fc\u30c8\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u90e8\u72b6\u614b\u306b\u5fdc\u3058\u3066\u632f\u308b\u821e\u3044\u3092\u5909\u66f4\u3059\u308b\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002enum\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u72b6\u614b\u7ba1\u7406\u3092\u660e\u78ba\u304b\u3064\u578b\u5b89\u5168\u306b\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-34\">\u57fa\u672c\u7684\u306a\u30b9\u30c6\u30fc\u30c8\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class PlayerState {\n    Idle,\n    Walking,\n    Running,\n    Jumping\n};\n\nclass Player {\nprivate:\n    PlayerState currentState;\n    float position;\n    float velocity;\n\npublic:\n    Player() : currentState(PlayerState::Idle), position(0.0f), velocity(0.0f) {}\n\n    void update(float deltaTime) {\n        switch (currentState) {\n            case PlayerState::Idle:\n                updateIdle(deltaTime);\n                break;\n            case PlayerState::Walking:\n                updateWalking(deltaTime);\n                break;\n            case PlayerState::Running:\n                updateRunning(deltaTime);\n                break;\n            case PlayerState::Jumping:\n                updateJumping(deltaTime);\n                break;\n        }\n    }\n\nprivate:\n    void updateIdle(float deltaTime) {\n        velocity = 0.0f;\n        \/\/ \u30a2\u30a4\u30c9\u30eb\u72b6\u614b\u306e\u66f4\u65b0\u30ed\u30b8\u30c3\u30af\n    }\n\n    void updateWalking(float deltaTime) {\n        position += velocity * deltaTime;\n        \/\/ \u6b69\u884c\u72b6\u614b\u306e\u66f4\u65b0\u30ed\u30b8\u30c3\u30af\n    }\n\n    void updateRunning(float deltaTime) {\n        position += velocity * 2.0f * deltaTime;\n        \/\/ \u8d70\u884c\u72b6\u614b\u306e\u66f4\u65b0\u30ed\u30b8\u30c3\u30af\n    }\n\n    void updateJumping(float deltaTime) {\n        position += velocity * deltaTime;\n        velocity -= 9.8f * deltaTime;  \/\/ \u91cd\u529b\u306e\u5f71\u97ff\n        \/\/ \u30b8\u30e3\u30f3\u30d7\u72b6\u614b\u306e\u66f4\u65b0\u30ed\u30b8\u30c3\u30af\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-35\">\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u4f7f\u7528\u4f8b<\/h3>\n\n\n\n<p>\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30d1\u30bf\u30fc\u30f3\u3067\u306f\u3001enum\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\u30bf\u30a4\u30d7\u3092\u6307\u5b9a\u3057\u3001\u578b\u5b89\u5168\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-36\">\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class WeaponType {\n    Sword,\n    Bow,\n    Staff,\n    Dagger\n};\n\n\/\/ \u62bd\u8c61\u57fa\u5e95\u30af\u30e9\u30b9\nclass Weapon {\npublic:\n    virtual ~Weapon() = default;\n    virtual void attack() = 0;\n    virtual int getDamage() const = 0;\n};\n\n\/\/ \u5177\u8c61\u30af\u30e9\u30b9\nclass Sword : public Weapon {\npublic:\n    void attack() override {\n        std::cout &lt;&lt; \"\u5263\u3067\u653b\u6483\" &lt;&lt; std::endl;\n    }\n    int getDamage() const override { return 10; }\n};\n\nclass Bow : public Weapon {\npublic:\n    void attack() override {\n        std::cout &lt;&lt; \"\u5f13\u3067\u653b\u6483\" &lt;&lt; std::endl;\n    }\n    int getDamage() const override { return 8; }\n};\n\n\/\/ \u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30af\u30e9\u30b9\nclass WeaponFactory {\npublic:\n    static std::unique_ptr&lt;Weapon&gt; createWeapon(WeaponType type) {\n        switch (type) {\n            case WeaponType::Sword:\n                return std::make_unique&lt;Sword&gt;();\n            case WeaponType::Bow:\n                return std::make_unique&lt;Bow&gt;();\n            \/\/ \u4ed6\u306e\u6b66\u5668\u30bf\u30a4\u30d7\u306e\u5b9f\u88c5\n            default:\n                throw std::invalid_argument(\"Unknown weapon type\");\n        }\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid equipWeapon(WeaponType type) {\n    auto weapon = WeaponFactory::createWeapon(type);\n    weapon-&gt;attack();\n    std::cout &lt;&lt; \"Damage: \" &lt;&lt; weapon-&gt;getDamage() &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-37\">\u3088\u308a\u9ad8\u5ea6\u306a\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u578b\u5b89\u5168\u306a\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u767b\u9332\u30b7\u30b9\u30c6\u30e0\nclass WeaponRegistry {\n    using CreatorFunc = std::function&lt;std::unique_ptr&lt;Weapon&gt;()&gt;;\n    static std::unordered_map&lt;WeaponType, CreatorFunc&gt; creators;\n\npublic:\n    template&lt;typename T&gt;\n    static void registerWeapon(WeaponType type) {\n        creators[type] = []() { return std::make_unique&lt;T&gt;(); };\n    }\n\n    static std::unique_ptr&lt;Weapon&gt; createWeapon(WeaponType type) {\n        auto it = creators.find(type);\n        if (it != creators.end()) {\n            return it-&gt;second();\n        }\n        throw std::invalid_argument(\"Unregistered weapon type\");\n    }\n};\n\n\/\/ \u767b\u9332\u4f8b\nvoid initializeWeapons() {\n    WeaponRegistry::registerWeapon&lt;Sword&gt;(WeaponType::Sword);\n    WeaponRegistry::registerWeapon&lt;Bow&gt;(WeaponType::Bow);\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b9\u30c6\u30fc\u30c8\u30d1\u30bf\u30fc\u30f3<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u72b6\u614b\u9077\u79fb\u306e\u660e\u78ba\u306a\u5b9a\u7fa9<\/li>\n\n\n\n<li>\u5404\u72b6\u614b\u306e\u72ec\u7acb\u3057\u305f\u51e6\u7406\u30ed\u30b8\u30c3\u30af<\/li>\n\n\n\n<li>\u72b6\u614b\u5909\u66f4\u306e\u4e00\u8cab\u6027\u7dad\u6301<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30d1\u30bf\u30fc\u30f3<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u578b\u5b89\u5168\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210<\/li>\n\n\n\n<li>\u62e1\u5f35\u6027\u3092\u8003\u616e\u3057\u305f\u8a2d\u8a08<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u9069\u5207\u306a\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5171\u901a\u306e\u6ce8\u610f\u70b9<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>enum\u306e\u5024\u306f\u660e\u78ba\u306a\u610f\u5473\u3092\u6301\u305f\u305b\u308b<\/li>\n\n\n\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u30b1\u30fc\u30b9\u306e\u9069\u5207\u306a\u51e6\u7406<\/li>\n\n\n\n<li>\u578b\u5b89\u5168\u6027\u306e\u78ba\u4fdd<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4fdd\u5b88\u6027\u304c\u9ad8\u304f\u3001\u62e1\u5f35\u3057\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-38\">enum\u306b\u307e\u3064\u308f\u308b\u4e00\u822c\u7684\u306a\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-39\">\u578b\u5b89\u5168\u6027\u306b\u95a2\u3059\u308b\u8ab2\u984c\u3068\u5bfe\u7b56<\/h3>\n\n\n\n<p>\u578b\u5b89\u5168\u6027\u306f\u3001enum\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u6700\u3082\u91cd\u8981\u306a\u8ab2\u984c\u306e\u4e00\u3064\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u306a\u554f\u984c\u3068\u89e3\u6c7a\u7b56\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-40\">\u6697\u9ed9\u306e\u578b\u5909\u63db\u554f\u984c<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u5b9f\u88c5\nenum Color { RED, GREEN, BLUE };\nvoid processColor(Color c) {\n    int value = c;      \/\/ \u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u53ef\u80fd\n    bool isRed = (c == 0); \/\/ \u6570\u5024\u3068\u306e\u76f4\u63a5\u6bd4\u8f03\u304c\u53ef\u80fd\n}\n\n\/\/ \u89e3\u6c7a\u7b56\uff1aenum class\u306e\u4f7f\u7528\nenum class SafeColor { Red, Green, Blue };\nvoid processSafeColor(SafeColor c) {\n    \/\/ int value = c;      \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\n    \/\/ bool isRed = (c == 0); \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\n    bool isRed = (c == SafeColor::Red); \/\/ OK\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-41\">\u5024\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">enum class Month : uint8_t {\n    January = 1,\n    February,\n    March,\n    \/\/ ... \u4ed6\u306e\u6708\n    December = 12\n};\n\nclass MonthValidator {\npublic:\n    static bool isValid(Month month) {\n        auto value = static_cast&lt;uint8_t&gt;(month);\n        return value &gt;= 1 &amp;&amp; value &lt;= 12;\n    }\n\n    static bool isValid(int value) {\n        return value &gt;= 1 &amp;&amp; value &lt;= 12;\n    }\n\n    static std::optional&lt;Month&gt; fromInt(int value) {\n        if (isValid(value)) {\n            return static_cast&lt;Month&gt;(value);\n        }\n        return std::nullopt;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-42\">\u7d99\u627f\u6642\u306e\u554f\u984c\u3068\u89e3\u6c7a\u30a2\u30d7\u30ed\u30fc\u30c1<\/h3>\n\n\n\n<p>enum\u3092\u7d99\u627f\u95a2\u4fc2\u3067\u4f7f\u7528\u3059\u308b\u969b\u306e\u554f\u984c\u3068\u3001\u305d\u308c\u306b\u5bfe\u3059\u308b\u52b9\u679c\u7684\u306a\u89e3\u6c7a\u7b56\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-43\">\u7d99\u627f\u968e\u5c64\u3067\u306e\u72b6\u614b\u7ba1\u7406<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u5b9f\u88c5\nclass Base {\nprotected:\n    enum State { INIT, RUNNING, STOPPED };\n    State state;\n};\n\nclass Derived : public Base {\n    enum State { PAUSED, RESUMED };  \/\/ \u57fa\u5e95\u30af\u30e9\u30b9\u306eState\u3068\u885d\u7a81\n};\n\n\/\/ \u89e3\u6c7a\u7b56\uff1aenum class\u3068\u30cd\u30fc\u30e0\u30b9\u30da\u30fc\u30b9\u306e\u4f7f\u7528\nnamespace BaseStates {\n    enum class State {\n        Init,\n        Running,\n        Stopped\n    };\n}\n\nnamespace DerivedStates {\n    enum class State {\n        Paused,\n        Resumed\n    };\n}\n\nclass BetterBase {\nprotected:\n    BaseStates::State state;\n};\n\nclass BetterDerived : public BetterBase {\nprivate:\n    DerivedStates::State derivedState;\n};<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-44\">\u72b6\u614b\u306e\u62e1\u5f35\u6027\u3092\u8003\u616e\u3057\u305f\u8a2d\u8a08<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u62e1\u5f35\u53ef\u80fd\u306a\u72b6\u614b\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\nclass StateMachine {\npublic:\n    enum class BaseState {\n        None,\n        Active,\n        Inactive\n    };\n\n    using StateType = uint32_t;\n\n    template&lt;typename EnumType&gt;\n    void setState(EnumType state) {\n        static_assert(std::is_enum_v&lt;EnumType&gt;, \"State must be an enum type\");\n        currentState = static_cast&lt;StateType&gt;(state);\n    }\n\n    template&lt;typename EnumType&gt;\n    bool isInState(EnumType state) const {\n        static_assert(std::is_enum_v&lt;EnumType&gt;, \"State must be an enum type\");\n        return currentState == static_cast&lt;StateType&gt;(state);\n    }\n\nprivate:\n    StateType currentState = 0;\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nclass AdvancedDevice : public StateMachine {\npublic:\n    enum class ExtendedState {\n        Initializing = 100,  \/\/ \u57fa\u672c\u72b6\u614b\u3068\u91cd\u8907\u3057\u306a\u3044\u5024\u3092\u4f7f\u7528\n        Processing,\n        Error\n    };\n\n    void initialize() {\n        setState(ExtendedState::Initializing);\n    }\n\n    bool isProcessing() {\n        return isInState(ExtendedState::Processing);\n    }\n};<\/pre>\n\n\n\n<p>\u4e3b\u306a\u554f\u984c\u3078\u306e\u5bfe\u51e6\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u578b\u5b89\u5168\u6027\u306e\u78ba\u4fdd<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>enum class\u306e\u4f7f\u7528\u3092\u5fb9\u5e95\u3059\u308b<\/li>\n\n\n\n<li>\u660e\u793a\u7684\u306a\u578b\u5909\u63db\u3092\u5f37\u5236\u3059\u308b<\/li>\n\n\n\n<li>\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\u3092\u5b9f\u88c5\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7d99\u627f\u95a2\u4fc2\u3067\u306e\u554f\u984c<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u540d\u524d\u7a7a\u9593\u3092\u6d3b\u7528\u3057\u3066\u885d\u7a81\u3092\u9632\u3050<\/li>\n\n\n\n<li>enum class\u3092\u4f7f\u7528\u3057\u3066\u30b9\u30b3\u30fc\u30d7\u3092\u5236\u5fa1\u3059\u308b<\/li>\n\n\n\n<li>\u62e1\u5f35\u6027\u3092\u8003\u616e\u3057\u305f\u8a2d\u8a08\u3092\u884c\u3046<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4fdd\u5b88\u6027\u306e\u5411\u4e0a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5024\u306e\u7bc4\u56f2\u3092\u660e\u78ba\u306b\u5b9a\u7fa9\u3059\u308b<\/li>\n\n\n\n<li>\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3092\u884c\u3046<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u89e3\u6c7a\u7b56\u3092\u9069\u5207\u306b\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u3067\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-45\">\u30e2\u30c0\u30f3C++\u3067\u306eenum\u6d3b\u7528\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-46\">\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04\u3068\u30b9\u30bf\u30a4\u30eb\u30ac\u30a4\u30c9<\/h3>\n\n\n\n<p>\u30e2\u30c0\u30f3C++\u306b\u304a\u3051\u308benum\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u5177\u4f53\u7684\u306a\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-47\">\u547d\u540d\u898f\u5247\u3068\u30b9\u30bf\u30a4\u30eb<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u63a8\u5968\u3055\u308c\u308b\u547d\u540d\u898f\u5247\nenum class HttpStatus : uint16_t {\n    Ok = 200,\n    NotFound = 404,\n    InternalServerError = 500\n};\n\n\/\/ \u975e\u63a8\u5968\u306e\u547d\u540d\u898f\u5247\nenum class httpstatus {  \/\/ \u5c0f\u6587\u5b57\u306f\u907f\u3051\u308b\n    ok = 200,           \/\/ \u5b9a\u6570\u5024\u306f\u5927\u6587\u5b57\u3067\u59cb\u3081\u308b\n    not_found = 404,    \/\/ \u30b9\u30cd\u30fc\u30af\u30b1\u30fc\u30b9\u306f\u907f\u3051\u308b\n    internal_server_error = 500\n};\n\n\/\/ \u57fa\u5e95\u578b\u306e\u660e\u793a\u7684\u306a\u6307\u5b9a\nenum class Flags : uint32_t {  \/\/ \u9069\u5207\u306a\u578b\u3092\u9078\u629e\n    None = 0x00,\n    Read = 0x01,\n    Write = 0x02,\n    Execute = 0x04\n};<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-48\">\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316\u3068\u30b3\u30e1\u30f3\u30c8<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/**\n * @brief \u30b7\u30b9\u30c6\u30e0\u306e\u52d5\u4f5c\u72b6\u614b\u3092\u8868\u3059\u5217\u6319\u578b\n * @details \u5404\u72b6\u614b\u306f\u6392\u4ed6\u7684\u3067\u3001\u4e00\u5ea6\u306b1\u3064\u306e\u72b6\u614b\u306e\u307f\u53d6\u308a\u5f97\u308b\n *\/\nenum class SystemState : uint8_t {\n    Inactive = 0,   \/\/\/&lt; \u30b7\u30b9\u30c6\u30e0\u306f\u975e\u30a2\u30af\u30c6\u30a3\u30d6\u72b6\u614b\n    Starting,       \/\/\/&lt; \u8d77\u52d5\u51e6\u7406\u4e2d\n    Active,         \/\/\/&lt; \u6b63\u5e38\u7a3c\u50cd\u4e2d\n    Stopping,       \/\/\/&lt; \u505c\u6b62\u51e6\u7406\u4e2d\n    Error          \/\/\/&lt; \u30a8\u30e9\u30fc\u72b6\u614b\n};\n\n\/\/ \u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u7528\u306e\u30d8\u30eb\u30d1\u30fc\u95a2\u6570\nconstexpr std::array&lt;SystemState, 5&gt; getAllSystemStates() {\n    return {\n        SystemState::Inactive,\n        SystemState::Starting,\n        SystemState::Active,\n        SystemState::Stopping,\n        SystemState::Error\n    };\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-49\">\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30c1\u30a7\u30c3\u30af\u6a5f\u80fd\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">template&lt;typename EnumType&gt;\nclass EnumValidator {\n    static_assert(std::is_enum_v&lt;EnumType&gt;, \"EnumType must be an enumeration\");\n\npublic:\n    static constexpr bool isValid(EnumType value) {\n        using UnderlyingType = std::underlying_type_t&lt;EnumType&gt;;\n        auto val = static_cast&lt;UnderlyingType&gt;(value);\n\n        \/\/ \u6709\u52b9\u306a\u5024\u306e\u7bc4\u56f2\u3092\u30c1\u30a7\u30c3\u30af\n        return isValidValue(val);\n    }\n\nprivate:\n    static constexpr bool isValidValue(auto val) {\n        \/\/ \u5b9f\u88c5\u56fa\u6709\u306e\u691c\u8a3c\u30ed\u30b8\u30c3\u30af\n        return true;  \/\/ \u30ab\u30b9\u30bf\u30e0\u5b9f\u88c5\u306b\u7f6e\u304d\u63db\u3048\u308b\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nstatic_assert(EnumValidator&lt;SystemState&gt;::isValid(SystemState::Active),\n    \"Invalid enum value\");<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-50\">\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>enum\u3092\u4f7f\u7528\u3057\u305f\u30b3\u30fc\u30c9\u306e\u30c6\u30b9\u30c8\u5bb9\u6613\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-51\">\u30c6\u30b9\u30c8\u53ef\u80fd\u306a\u8a2d\u8a08<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class StateMachine {\npublic:\n    enum class State {\n        Initial,\n        Running,\n        Paused,\n        Completed\n    };\n\n    \/\/ \u30c6\u30b9\u30c8\u53ef\u80fd\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\n    virtual State getState() const { return currentState; }\n    virtual void setState(State newState) { currentState = newState; }\n\n    \/\/ \u72b6\u614b\u9077\u79fb\u306e\u30e2\u30c3\u30af\u5316\u304c\u53ef\u80fd\n    virtual bool canTransitionTo(State nextState) const {\n        return isValidTransition(currentState, nextState);\n    }\n\nprotected:\n    virtual bool isValidTransition(State from, State to) const {\n        \/\/ \u9077\u79fb\u30eb\u30fc\u30eb\u306e\u5b9f\u88c5\n        return true;  \/\/ \u5b9f\u969b\u306e\u5b9f\u88c5\u3067\u306f\u9069\u5207\u306a\u6761\u4ef6\u3092\u8a2d\u5b9a\n    }\n\nprivate:\n    State currentState = State::Initial;\n};\n\n\/\/ \u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u4f8b\nclass MockStateMachine : public StateMachine {\npublic:\n    MOCK_METHOD(State, getState, (), (const, override));\n    MOCK_METHOD(void, setState, (State), (override));\n    MOCK_METHOD(bool, canTransitionTo, (State), (const, override));\n};<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-52\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class EnumUtilsTest : public ::testing::Test {\nprotected:\n    enum class TestEnum {\n        Value1,\n        Value2,\n        Value3\n    };\n\n    void SetUp() override {\n        \/\/ \u30c6\u30b9\u30c8\u306e\u6e96\u5099\n    }\n};\n\nTEST_F(EnumUtilsTest, ValidateEnumValue) {\n    EXPECT_TRUE(EnumValidator&lt;TestEnum&gt;::isValid(TestEnum::Value1));\n    EXPECT_TRUE(EnumValidator&lt;TestEnum&gt;::isValid(TestEnum::Value2));\n    EXPECT_TRUE(EnumValidator&lt;TestEnum&gt;::isValid(TestEnum::Value3));\n}<\/pre>\n\n\n\n<p>\u30e2\u30c0\u30f3C++\u3067\u306eenum\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u8a2d\u8a08\u539f\u5247<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5e38\u306benum class\u3092\u4f7f\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u57fa\u5e95\u578b\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\u3059\u308b<\/li>\n\n\n\n<li>\u547d\u540d\u898f\u5247\u3092\u4e00\u8cab\u3057\u3066\u9069\u7528\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5b9f\u88c5\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5024\u306e\u7bc4\u56f2\u3092\u660e\u78ba\u306b\u5b9a\u7fa9\u3059\u308b<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30c1\u30a7\u30c3\u30af\u3092\u6d3b\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316\u3092\u884c\u3046<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e2\u30c3\u30af\u53ef\u80fd\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u8a2d\u8a08\u3059\u308b<\/li>\n\n\n\n<li>\u72b6\u614b\u9077\u79fb\u306e\u30c6\u30b9\u30c8\u3092\u5bb9\u6613\u306b\u3059\u308b<\/li>\n\n\n\n<li>\u5358\u4f53\u30c6\u30b9\u30c8\u3092\u5fb9\u5e95\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u9075\u5b88\u3059\u308b\u3053\u3068\u3067\u3001\u4fdd\u5b88\u6027\u304c\u9ad8\u304f\u3001\u4fe1\u983c\u6027\u306e\u3042\u308b\u30b3\u30fc\u30c9\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-1672","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\/1672","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=1672"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1672\/revisions"}],"predecessor-version":[{"id":1673,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1672\/revisions\/1673"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}