{"id":6561,"date":"2025-09-23T02:45:19","date_gmt":"2025-09-23T02:45:19","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=6561"},"modified":"2025-09-23T02:45:19","modified_gmt":"2025-09-23T02:45:19","slug":"go%e3%81%ae%e2%80%a0%e9%bb%92%e9%ad%94%e8%a1%93%e2%80%a0%e3%81%ab%e5%af%be%e3%81%99%e3%82%8b%e9%98%b2%e8%a1%9b%e8%a1%93-%ef%bd%9edefence-against-the-gos-dark-arts%ef%bd%9e","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/6561\/","title":{"rendered":"Go\u306e\u2020\u9ed2\u9b54\u8853\u2020\u306b\u5bfe\u3059\u308b\u9632\u885b\u8853 \uff5eDefence Against the Go&#8217;s dark Arts\uff5e"},"content":{"rendered":"\n<\/p>\n<div>\n<p>\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u306e\u4e16\u754c\u3067\u306f\u3001\u4e00\u898b\u3059\u308b\u3068\u52d5\u4f5c\u539f\u7406\u304c\u4e0d\u53ef\u89e3\u3067\u3042\u308a\u306a\u304c\u3089\u3001\u8a00\u8a9e\u4ed5\u69d8\u306e\u5de7\u307f\u306a\uff08\u3042\u308b\u3044\u306f\u5f37\u5f15\u306a\uff09\u89e3\u91c8\u306b\u3088\u3063\u3066\u6a5f\u80fd\u3059\u308b\u3001\u82b8\u8853\u7684\u3067\u7f8e\u3057\u3044\u3001\u3042\u308b\u3044\u306f\u6050\u308d\u3057\u3044\u30b3\u30fc\u30c9\u3092\u3001\u754f\u656c\u306e\u5ff5\u3092\u8fbc\u3081\u3066 <strong>\u300e\u9ed2\u9b54\u8853\u300f<\/strong> \u3068\u547c\u3076\u3053\u3068\u304c\u3042\u308a\u307e\u3059<\/p>\n<p>Go\u306f\u3001\u305d\u306e\u30b7\u30f3\u30d7\u30eb\u3055\u3068\u5805\u7262\u306a\u578b\u30b7\u30b9\u30c6\u30e0\u306b\u3088\u3063\u3066\u3001\u672c\u6765\u3053\u306e\u3088\u3046\u306a\u300e\u9ed2\u9b54\u8853\u300f\u304c\u751f\u307e\u308c\u306b\u304f\u3044\u8a00\u8a9e\u3067\u3059\u304c<br \/>\n\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6975\u9650\u7684\u306a\u8ffd\u6c42\u3084\u3001\u8a00\u8a9e\u4ed5\u69d8\u4e0a\u901a\u5e38\u306f\u4e0d\u53ef\u80fd\u306a\u51e6\u7406\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u3001<code>reflect<\/code> package \u3084 <code>unsafe<\/code> package \u3084 <code>go:linkname<\/code> \u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6 \u306e\u3088\u3046\u306a\u3044\u304f\u3064\u304b\u306e <strong>\u300e\u5927\u3044\u306a\u308b\u529b\u300f<\/strong> \u3092\u7528\u610f\u3057\u3066\u3044\u307e\u3059<\/p>\n<p>\u65e5\u3005\u771f\u7406\u306e\u63a2\u7a76\u306b\u52e4\u3057\u3080\u6211\u3005\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30a8\u30f3\u30b8\u30cb\u30a2\u306f\u305d\u3093\u306a\u300e\u9ed2\u9b54\u8853\u300f\u304c\u5927\u597d\u304d\u3067\u3059\u3002<\/p>\n<p>Go Conference 2025\u306e\u30ef\u30fc\u30af\u30b7\u30e7\u30c3\u30d7\u3067\u3082newmo\u3055\u3093\u304c\u2020\u9ed2\u9b54\u8853\u8b1b\u5ea7\u2020\u306e\u30ef\u30fc\u30af\u30b7\u30e7\u30c3\u30d7\u3092\u3059\u308b\u3088\u3046\u3067\u3059\u306d<br \/>\n<iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgocon.jp%2F2025%2Fworkshops%2F1013431%2F\" title=\"\u2020\u958b\u767a\u3092\u52a0\u901f\u3055\u305b\u308b\u9ed2\u9b54\u8853\u8b1b\u5ea7\u2020 | Go Conference 2025\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/gocon.jp\/2025\/workshops\/1013431\/\">gocon.jp<\/a><\/cite><\/p>\n<p>\u3057\u304b\u3057\u3001<strong>\u300e\u9ed2\u9b54\u8853\u300f<\/strong> \u3092\u884c\u4f7f\u3059\u308b\u969b\u306b\u5229\u7528\u3059\u308b <strong>\u300e\u5927\u3044\u306a\u308b\u529b\u300f<\/strong> \u306b\u306f\u304a\u7d04\u675f\u3067\u306f\u3042\u308a\u307e\u3059\u304c <strong>\u300e\u5927\u304d\u306a\u4ee3\u511f\u300f<\/strong> \u304c\u4f34\u3044\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306f\u305d\u3093\u306a <strong>\u300e\u9ed2\u9b54\u8853\u300f<\/strong> \u3092\u5b89\u5168\u306b\u5229\u7528\u3059\u308b\u305f\u3081\u306e\u9632\u885b\u8853<\/p>\n<p>\u984c\u3057\u3066<\/p>\n<p><strong>\u9ed2\u9b54\u8853\u306b\u5bfe\u3059\u308b\u9632\u885b\u8853 \uff5eDefence Against the Go&#8217;s dark Arts\uff5e<\/strong><\/p>\n<p>(\u7565\u3057\u3066 <strong>\u2020DAGA\u2020<\/strong> )<\/p>\n<p>\u3092\u52c9\u5f37\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046<\/p>\n<hr\/>\n<p>\u3069\u3046\u3082\u3001ANDPAD \u30c6\u30c3\u30af\u30ea\u30fc\u30c9\u306e tomtwinkle \u3067\u3059<\/p>\n<p>\u4eca\u5ea6\u30019\/30 \u306eGo 1.25\u306e\u30ea\u30ea\u30d1\u306eLT\u3067\u767b\u58c7\u3059\u308b\u4e88\u5b9a\u3067\u3059\u304c\u3001\u4eca\u56de\u306e\u5185\u5bb9\u306f <strong>LT\u306e\u4e8b\u524d\u5b66\u7fd2\uff08\u3082\u3057\u304f\u306fLT\u5f8c\u306e\u4e8b\u5f8c\u5b66\u7fd2\uff09\u306e\u70ba\u306e\u5185\u5bb9<\/strong> \u306b\u306a\u308a\u307e\u3059<\/p>\n<p><strong>\u30ea\u30ea\u30d1\u306e\u65b9\u3082\u8208\u5473\u3042\u3063\u305f\u3089\u307f\u3066\u307f\u3066\u306d!!!<\/strong><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/gocon.connpass.com\/event\/366062\/\">Go 1.25 \u30ea\u30ea\u30fc\u30b9\u30d1\u30fc\u30c6\u30a3 &amp; GopherCon 2025 \u5831\u544a\u4f1a &#8211; connpass<\/a><\/p>\n<p>9\u6708\u306fGo\u306e\u30a4\u30d9\u30f3\u30c8\u304c\u9023\u7d9a\u3057\u3066\u3044\u3066 &#8220;Go&#8221; lden Week \u3067\u3059\u306d\u30019\u6708\u306a\u306e\u306b<\/p>\n<p>Go 1.25 \u30ea\u30ea\u30fc\u30b9\u30d1\u30fc\u30c6\u30a3 &amp; GopherCon 2025 \u5831\u544a\u4f1a \u306f\u305d\u306e\u6700\u5f8c\u306e\u30a4\u30d9\u30f3\u30c8\u306b\u306a\u308a\u307e\u3059<\/p>\n<p><strong>\u30ea\u30ea\u30d1\u306f\u5f0a\u793e\u306e\u5f15\u8d8a\u3057\u76f4\u5f8c\u306e\u65b0\u30aa\u30d5\u30a3\u30b9\u3067\u306e\u958b\u50ac\u306b\u306a\u308a\u307e\u3059\uff01<\/strong><br \/>\n(\u79c1\u3082\u591a\u5206\u305d\u306e\u65e5\u521d\u3081\u3066\u65b0\u30aa\u30d5\u30a3\u30b9\u306b\u884c\u304f\u4e88\u5b9a\u3067\u3059\u3002)<\/p>\n<p><strong>ANDPAD\u306e\u65b0\u30aa\u30d5\u30a3\u30b9\u89b3\u5149\u3082\u517c\u306d\u3066\u7686\u69d8\u306e\u53c2\u52a0\u304a\u5f85\u3061\u3057\u3066\u3044\u307e\u3059!!!<\/strong><\/p>\n<hr\/>\n<h2 id=\"\u9ed2\u9b54\u8853\u3092\u3069\u3046\u3084\u3063\u3066\u4f7f\u3046\u304b\">\u9ed2\u9b54\u8853\u3092\u3069\u3046\u3084\u3063\u3066\u4f7f\u3046\u304b<\/h2>\n<p>Go\u306e\u9ed2\u9b54\u8853\u306e\u4e2d\u3067\u3082\u578b\u3092\u7834\u58ca\u3057\u305f\u308a\u751f\u306epointer\u3092\u89e6\u3063\u305f\u308a\u3059\u308b\u30b3\u30fc\u30c9\u306e\u5bfe\u8c61\u306f\u5927\u62b5\u9ed2\u9b54\u8853\u306e\u5b9f\u884c\u8005\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u5916\u306e\u30b3\u30fc\u30c9\u306b\u5bfe\u3057\u3066\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n<p>\u4f55\u6545\u306a\u3089\u81ea\u5206\u3067\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u51fa\u6765\u308b\u306a\u3089\u308f\u3056\u308f\u3056unsafe pointer\u306a\u3093\u3066\u4f7f\u308f\u306a\u304f\u3066\u3082refactoring\u306a\u308a\u306a\u3093\u306a\u308a\u3067\u305d\u306e\u30b3\u30fc\u30c9\u3092\u4fee\u6b63\u3059\u308c\u3070\u826f\u3044\u304b\u3089\u3067\u3059\u306d\u3002<\/p>\n<p>\u3088\u304f\u3042\u308b\u8a71\u3067\u306f\u30011\u5e74\u304f\u3089\u3044\u524d\u306b\u66f8\u3044\u305f <code>go:linkname<\/code> \u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6\u306e\u3088\u3046\u306aruntime\u306eprivate\u306a\u95a2\u6570\u3092\u81ea\u5206\u306e\u30b3\u30fc\u30c9\u5185\u306b\u53ec\u559a\u3057\u3066\u5229\u7528\u3057\u3088\u3046\u3068\u3057\u305f\u308a\u3001runtime\u5185\u306einternal\u306a\u30b3\u30fc\u30c9\u3092\u6539\u9020\u3057\u3066\u5229\u7528\u3057\u305f\u3044\u304c\u305f\u3081\u306b <code>unsafe.Pointer<\/code> \u3092\u5229\u7528\u3057\u3066\u578b\u306e\u30ab\u30d7\u30bb\u30eb\u5316\u3092\u7834\u58ca\u3057\u305f\u308a\u3068\u304b\u3067\u3059\u306d\u3002<\/p>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Ftech.andpad.co.jp%2Fentry%2F2024%2F06%2F20%2F140000\" title=\"Go\u754c\u9688\u3067\u5dfb\u304d\u8d77\u3053\u3063\u305f go:linkname \u9a12\u52d5\u306b\u3064\u3044\u3066 - ANDPAD Tech Blog\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/tech.andpad.co.jp\/entry\/2024\/06\/20\/140000\">tech.andpad.co.jp<\/a><\/cite><\/p>\n<p>\u3053\u3053\u3067\u6ce8\u610f\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306e\u306f<\/p>\n<p><strong>\u9ed2\u9b54\u8853\u3092\u5b9f\u88c5\u3059\u308b\u6642\u306b\u306f\u3001&#8221;\u9ed2\u9b54\u8853\u3092\u5b9f\u88c5\u3057\u305f\u6642\u70b9\u3067\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u5916\u306e\u5b9f\u88c5&#8221; \u3092\u5143\u306b\u9ed2\u9b54\u8853\u3092\u69cb\u7bc9\u3059\u308b\u3053\u3068<\/strong> \u3067\u3059\u3002<\/p>\n<p>\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u5916\u306e\u5b9f\u88c5\u306e\u73fe\u6642\u70b9\u3067\u306e\u5b9f\u88c5\u3092\u53c2\u8003\u3057\u3066\u3044\u308b\u3068\u4f55\u304c\u307e\u305a\u3044\u304b\u3002<\/p>\n<p>\u305d\u308c\u306f\u3001 <strong>\u5c06\u6765\u7684\u306b\u305d\u306e\u30b3\u30fc\u30c9\u304c\u5909\u66f4\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b<\/strong> \u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<p> <code>go:linkname<\/code> \u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6 \u306e\u6642\u3082\u53c2\u7167\u5143\u306eruntime\u306e\u30b3\u30fc\u30c9\u304c\u5909\u66f4\u3055\u308c\u305f\u7d50\u679c\u3001\u305d\u308c\u3092\u53c2\u7167\u3057\u3066\u3044\u305f\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30fc\u88fd\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u58ca\u308c\u3066\u5927\u9a12\u304e\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u7279\u306b\u5371\u967a\u306a\u306e\u306f\u5148\u307b\u3069\u8ff0\u3079\u305f unsafe.Pointer\u3092\u5229\u7528\u3057\u3066\u578b\u306e\u30ab\u30d7\u30bb\u30eb\u5316\u3092\u7834\u58ca\u3059\u308b\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">type<\/span> Foo <span class=\"synStatement\">struct<\/span> {\n    private <span class=\"synType\">string<\/span>\n}\n\n<span class=\"synStatement\">func<\/span> GetFoo() *Foo {\n    <span class=\"synStatement\">return<\/span> &amp;Foo{\n        private: <span class=\"synConstant\">\"Foo!\"<\/span>,\n    }\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    foo := GetFoo()\n\n    \n    fmt.Printf(<span class=\"synConstant\">\"Before: %#v<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, foo)\n\n    \n    <span class=\"synStatement\">type<\/span> cloneFoo <span class=\"synStatement\">struct<\/span> {\n        private <span class=\"synType\">string<\/span>\n    }\n    \n    <span class=\"synStatement\">type<\/span> uP = <span class=\"synType\">unsafe.Pointer<\/span>\n    <span class=\"synStatement\">var<\/span> ptr *cloneFoo\n    *(*uP)(uP(&amp;ptr)) = uP(foo)\n    ptr.private = <span class=\"synConstant\">\"Kuromajutsu!\"<\/span>\n\n    \n    fmt.Printf(<span class=\"synConstant\">\"After: %#v<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, foo)\n}\n<\/pre>\n<p><a target=\"_blank\" href=\"https:\/\/go.dev\/play\/p\/m2KbOT5BHEc\">https:\/\/go.dev\/play\/p\/m2KbOT5BHEc<\/a><\/p>\n<p>Foo \u3068\u540c\u3058\u30e1\u30e2\u30ea\u69cb\u9020\u306estruct cloneFoo \u3092\u5b9f\u88c5\u3057\u305f\u4e0a\u3067\u3001 <code>unsafe.Pointer<\/code> \u3092\u4f7f\u3063\u3066\u3001<code>*Foo<\/code> \u578b\u3092 <code>*cloneFoo<\/code> \u578b\u3068\u3057\u3066\u89e3\u91c8\u3055\u305b\u307e\u3059\u3002<\/p>\n<p>\u5909\u6570 ptr \u306f \u5909\u6570 foo \u3068\u5168\u304f\u540c\u3058\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u3059\u3088\u3046\u306b\u306a\u308b\u305f\u3081prt\u306e\u5024\u3092\u66f8\u304d\u63db\u3048\u308c\u3070\u3001\u672c\u6765\u66f8\u304d\u63db\u3048\u304c\u51fa\u6765\u306a\u3044struct \u306e private filed \u3092\u66f8\u304d\u63db\u3048\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2 id=\"\u9ed2\u9b54\u8853\u306e\u526f\u4f5c\u7528\">\u9ed2\u9b54\u8853\u306e\u526f\u4f5c\u7528<\/h2>\n<p>\u3067\u306f\u3053\u3053\u3067\u3082\u3057\u3001 <strong>Foo\u306e\u5b9f\u88c5\u304c\u5909\u308f\u3063\u3066\u3057\u307e\u3063\u305f\u5834\u5408<\/strong> \u306f\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\uff1f<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">type<\/span> Foo <span class=\"synStatement\">struct<\/span> {\n    number  <span class=\"synType\">int32<\/span>\n    private <span class=\"synType\">string<\/span>\n}\n\n<span class=\"synStatement\">func<\/span> GetFoo() *Foo {\n    <span class=\"synStatement\">return<\/span> &amp;Foo{\n        number:  <span class=\"synConstant\">10<\/span>,\n        private: <span class=\"synConstant\">\"Foo!\"<\/span>,\n    }\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    foo := GetFoo()\n\n    fmt.Printf(<span class=\"synConstant\">\"Before: %#v<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, foo)\n\n    <span class=\"synStatement\">type<\/span> cloneFoo <span class=\"synStatement\">struct<\/span> {\n        private <span class=\"synType\">string<\/span>\n    }\n\n    <span class=\"synStatement\">type<\/span> uP = <span class=\"synType\">unsafe.Pointer<\/span>\n    <span class=\"synStatement\">var<\/span> ptr *cloneFoo\n    *(*uP)(uP(&amp;ptr)) = uP(foo)\n    ptr.private = <span class=\"synConstant\">\"Kuromajutsu!\"<\/span>\n\n    \n    fmt.Printf(<span class=\"synConstant\">\"After: %#v<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, foo)\n}\n<\/pre>\n<p><a target=\"_blank\" href=\"https:\/\/go.dev\/play\/p\/E9bvSG12vRQ\">https:\/\/go.dev\/play\/p\/E9bvSG12vRQ<\/a><\/p>\n<p><strong>\u30b3\u30f3\u30d1\u30a4\u30eb\u81ea\u4f53\u306f\u6b63\u5e38\u306b\u901a\u308a<\/strong> \u3001<code>unsafe.Pointer<\/code> \u306e\u51e6\u7406\u3067\u306f\u7279\u306b\u30a8\u30e9\u30fc\u306b\u306a\u3089\u305a <strong>\u5909\u6570\u3092\u53c2\u7167\u3059\u308b\u969b\u306bruntime error<\/strong> \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u8981\u3059\u308b\u306b <strong>\u30b3\u30fc\u30c9\u304c\u5b9f\u884c\u3055\u308c\u308b\u307e\u3067\u30a8\u30e9\u30fc\u306b\u6c17\u3065\u304b\u306a\u3044\u975e\u5e38\u306b\u5371\u967a\u306a\u72b6\u614b<\/strong> \u3067\u3059\u3002<\/p>\n<p>\u3068\u3044\u3046\u308f\u3051\u3067\u3001\u4eca\u56de\u306e\u672c\u984c<\/p>\n<p>\u53c2\u7167\u5143\u306e\u30b3\u30fc\u30c9\u304c\u5909\u66f4\u3055\u308c\u3066\u300e\u9ed2\u9b54\u8853\u300f\u306e\u6761\u4ef6\u304c\u5909\u308f\u3063\u3066\u3057\u307e\u3063\u305f\u6642\u306b \u691c\u77e5\u3059\u308b\u4ed5\u7d44\u307f<\/p>\n<p><strong>\u9ed2\u9b54\u8853\u306b\u5bfe\u3059\u308b\u9632\u885b\u8853 \uff5eDefence Against the Go&#8217;s dark Arts\uff5e<\/strong><\/p>\n<p>\u4e00\u822c\u7684\u306b\u306f <strong>\u300c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u300d<\/strong> \u3068\u547c\u3070\u308c\u308b\u4ed5\u7d44\u307f\u306e\u4e00\u90e8\u3092\u7d39\u4ecb\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2 id=\"\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u9069\u5408\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\">\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u9069\u5408\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3<\/h2>\n<h3 id=\"\u6a19\u6e96\u7684\u306a\u69cb\u6587\">\u6a19\u6e96\u7684\u306a\u69cb\u6587<\/h3>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">type<\/span> Example <span class=\"synStatement\">struct<\/span>{}\n\n<span class=\"synStatement\">func<\/span> (e Example) Foo(b []<span class=\"synType\">byte<\/span>) <span class=\"synType\">error<\/span> { <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span> }\n<span class=\"synStatement\">func<\/span> (e Example) Bar(s <span class=\"synType\">string<\/span>) <span class=\"synType\">error<\/span> { <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span> }\n\n<span class=\"synStatement\">type<\/span> implemented <span class=\"synStatement\">interface<\/span> {\n    Foo([]<span class=\"synType\">byte<\/span>) <span class=\"synType\">error<\/span>\n    Bar(<span class=\"synType\">string<\/span>) <span class=\"synType\">error<\/span>\n}\n\n<span class=\"synStatement\">var<\/span> _ implemented = (*Example)(<span class=\"synStatement\">nil<\/span>)\n\n<span class=\"synStatement\">var<\/span> _ implemented = Example{}\n<\/pre>\n<p><a target=\"_blank\" href=\"https:\/\/go.dev\/play\/p\/Bj5KLkxjitk\">https:\/\/go.dev\/play\/p\/Bj5KLkxjitk<\/a><\/p>\n<h3 id=\"\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0\">\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0<\/h3>\n<p>Go\u3067\u306f\u5272\u3068\u3069\u3053\u3067\u3082\u4e00\u822c\u7684\u306b\u5229\u7528\u3055\u308c\u3066\u3044\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u3092\u78ba\u8a8d\u3059\u308b\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u306d\u3002<\/p>\n<ul>\n<li>\n<p><strong><code>var _<\/code><\/strong> :<br \/>\n\u30d6\u30e9\u30f3\u30af\u8b58\u5225\u5b50 _ \u306f\u3001\u5ba3\u8a00\u3055\u308c\u305f\u5909\u6570\u304c\u3069\u3053\u304b\u3089\u3082\u4f7f\u7528\u3055\u308c\u306a\u3044\u3053\u3068\u3092\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u4f1d\u3048\u307e\u3059\u3002<br \/>\u3053\u308c\u306b\u3088\u308a\u3001\u300c\u672a\u4f7f\u7528\u5909\u6570\u300d\u3068\u3044\u3046\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3092\u56de\u907f\u3057\u3064\u3064\u3001\u4ee3\u5165\u306e\u53f3\u8fba\u3092\u8a55\u4fa1\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\u3053\u306e\u6587\u8108\u3067\u306f\u3001\u5909\u6570\u306e\u5024\u3092\u4fdd\u6301\u3059\u308b\u5fc5\u8981\u306f\u306a\u304f\u3001\u4ee3\u5165\u3068\u3044\u3046\u884c\u70ba\u81ea\u4f53\u304c\u76ee\u7684\u3067\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong><code>(*Type)(nil)<\/code><\/strong> :<br \/>\nType\u3078\u306enil\u30dd\u30a4\u30f3\u30bf\u30fc\u3092\u751f\u6210\u3057\u307e\u3059\u3002Method Set\u306e\u691c\u8a3c\u306b\u306f\u5b9f\u969b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u4e0d\u8981\u306a\u306e\u3067nil\u30dd\u30a4\u30f3\u30bf\u30fc\u3092\u5229\u7528\u3057\u305f\u65b9\u304c\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u826f\u3044\u3067\u3059( \u6c17\u306b\u3057\u306a\u3044\u306a\u3089 Type{} \u3067\u5b9a\u7fa9\u3057\u3066\u3082\u554f\u984c\u3042\u308a\u307e\u305b\u3093 )\u3002<\/p>\n<\/li>\n<li>\n<p><strong><code>Interface<\/code><\/strong> :<br \/>\n\u578b\u304c\u6e80\u305f\u3059\u3079\u304d\u898f\u7d04(Method Set)\u3092\u5b9a\u7fa9\u3059\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/p>\n<\/li>\n<li>\n<p><strong><code>=<\/code><\/strong> :<br \/>\n\u4ee3\u5165\u6f14\u7b97\u5b50\u3067\u3059\u3001\u3053\u308c\u304c\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u578b\u30c1\u30a7\u30c3\u30af\u6a5f\u69cb\u3092\u8d77\u52d5\u3059\u308b\u30c8\u30ea\u30ac\u30fc\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\n\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3001\u53f3\u8fba\u306e\u5f0f\u306e\u578b\u304c\u3001\u5de6\u8fba\u306e\u578b\uff08\u3053\u306e\u5834\u5408\u306fInterface\uff09\u306b\u4ee3\u5165\u53ef\u80fd\u304b\u3069\u3046\u304b\u3092\u53b3\u5bc6\u306b\u691c\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u3082\u3057Type \u304c Interface\u306eMethod Set\u3092\u5b8c\u5168\u306b\u6e80\u305f\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">cannot use XXX as implemented value in variable declaration: XXX does not implement implemented (missing method XXX)<\/pre>\n<p>\u3068\u3044\u3063\u305f\u8da3\u65e8\u306e\u30a8\u30e9\u30fc\u3092\u751f\u6210\u3057\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u306f\u5931\u6557\u3057\u307e\u3059\u3002<br \/>\u3053\u308c\u306b\u3088\u308a\u3001\u578b\u306e\u898f\u7d04\u9075\u5b88\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u4fdd\u8a3c\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3 id=\"\u4e3b\u306a\u7528\u9014\">\u4e3b\u306a\u7528\u9014<\/h3>\n<p>\u516c\u958bAPI\u3084\u91cd\u8981\u306a\u5185\u90e8\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067interface\u578b\u306b\u5909\u66f4\u304c\u3042\u3063\u305f\u6642\u306b\u958b\u767a\u8005\u306b\u5b9f\u88c5\u306e\u4fee\u6b63\u3092\u4fc3\u3059\u305f\u3081\u306b\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u308b\u30a4\u30c7\u30a3\u30aa\u30e0\u3067\u3059\u3002<\/p>\n<h3 id=\"\u5b9f\u88c5\u4f8b\">\u5b9f\u88c5\u4f8b<\/h3>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n<span class=\"synStatement\">type<\/span> onlyValuesCtx <span class=\"synStatement\">struct<\/span> {\n    context.Context\n    lookupValues context.Context\n}\n\n<span class=\"synStatement\">var<\/span> _ context.Context = (*onlyValuesCtx)(<span class=\"synStatement\">nil<\/span>)\n<\/pre>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n<span class=\"synStatement\">type<\/span> ReaderFrom <span class=\"synStatement\">interface<\/span> {\n    ReadFrom(r Reader) (n <span class=\"synType\">int64<\/span>, err <span class=\"synType\">error<\/span>)\n}\n\n<span class=\"synStatement\">type<\/span> discard <span class=\"synStatement\">struct<\/span>{}\n<span class=\"synStatement\">var<\/span> _ ReaderFrom = discard{}\n<\/pre>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n<span class=\"synStatement\">type<\/span> closeWriter <span class=\"synStatement\">interface<\/span> {\n    CloseWrite() <span class=\"synType\">error<\/span>\n}\n\n<span class=\"synStatement\">var<\/span> _ closeWriter = (*net.TCPConn)(<span class=\"synStatement\">nil<\/span>)\n<\/pre>\n<p>\u6a19\u6e96\u30d1\u30c3\u30b1\u30fc\u306e\u4e2d\u3067\u3082\u3088\u304f\u51fa\u3066\u304d\u307e\u3059\u3002<\/p>\n<p>\u7686\u3055\u3093\u3082\u3088\u304f\u898b\u305f\u3053\u3068\u304c\u3042\u308b\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<h2 id=\"\u914d\u5217\u9577\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\">\u914d\u5217\u9577\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3<\/h2>\n<h3 id=\"\u6a19\u6e96\u7684\u306a\u69cb\u6587-1\">\u6a19\u6e96\u7684\u306a\u69cb\u6587<\/h3>\n<p><strong>\u4f8b1: <code>x\/tools<\/code> \u306e <code>cmd\/stringer<\/code> \u3067 enum \u306e <code>String()<\/code> \u95a2\u6570\u3092\u81ea\u52d5\u751f\u6210\u3059\u308b\u4f8b<\/strong><\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> painkiller\n\n<span class=\"synStatement\">type<\/span> Pill <span class=\"synType\">int<\/span>\n\n<span class=\"synStatement\">const<\/span> (\n    Placebo Pill = <span class=\"synStatement\">iota<\/span>\n    Aspirin\n    Ibuprofen\n    Paracetamol\n    Acetaminophen = Paracetamol\n)\n---\n<span class=\"synStatement\">func<\/span> _() {\n    \n    \n    <span class=\"synStatement\">var<\/span> x [<span class=\"synConstant\">1<\/span>]<span class=\"synStatement\">struct<\/span>{}\n    _ = x[Placebo-<span class=\"synConstant\">0<\/span>]\n    _ = x[Aspirin-<span class=\"synConstant\">1<\/span>]\n    _ = x[Ibuprofen-<span class=\"synConstant\">2<\/span>]\n    _ = x[Paracetamol-<span class=\"synConstant\">3<\/span>]\n}\n<\/pre>\n<p><a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/golang.org\/x\/tools@v0.37.0\/cmd\/stringer\">https:\/\/pkg.go.dev\/golang.org\/x\/tools@v0.37.0\/cmd\/stringer<\/a><\/p>\n<p><strong>\u4f8b2: \u7570\u306a\u308b\u578b\u306e\u540c\u4e00\u6027\u3092\u78ba\u8a8d\u3059\u308b\u4f8b<\/strong><\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">type<\/span> Foo <span class=\"synStatement\">struct<\/span> { F <span class=\"synType\">int64<\/span> }\n<span class=\"synStatement\">type<\/span> Bar <span class=\"synStatement\">struct<\/span> { F <span class=\"synType\">int64<\/span> }\n\n<span class=\"synStatement\">const<\/span> X, Y = <span class=\"synType\">int64<\/span>(unsafe.Sizeof(Foo{})), <span class=\"synType\">int64<\/span>(unsafe.Sizeof(Bar{}))\n<span class=\"synStatement\">var<\/span> _ [X - Y]<span class=\"synType\">int<\/span>\n<span class=\"synStatement\">var<\/span> _ [Y - X]<span class=\"synType\">int<\/span>\n\n<span class=\"synStatement\">const<\/span> delta = <span class=\"synType\">int64<\/span>(unsafe.Sizeof(Foo{})) - <span class=\"synType\">int64<\/span>(unsafe.Sizeof(Bar{}))\n<span class=\"synStatement\">var<\/span> _ [-delta * delta]<span class=\"synType\">int<\/span>\n\n<span class=\"synStatement\">var<\/span> _ [<span class=\"synConstant\">0<\/span>]<span class=\"synType\">byte<\/span> = [delta]<span class=\"synType\">byte<\/span>{}\n<\/pre>\n<p><a target=\"_blank\" href=\"https:\/\/go.dev\/play\/p\/CW5Hk3wBJEQ\">https:\/\/go.dev\/play\/p\/CW5Hk3wBJEQ<\/a><\/p>\n<h3 id=\"\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0-1\">\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0<\/h3>\n<p>Go\u306e\u8a00\u8a9e\u4ed5\u69d8\u3067\u306f\u3001\u914d\u5217\u306e\u9577\u3055\u306f\u8ca0\u306e\u5b9a\u6570\u3067\u3042\u3063\u3066\u306f\u306a\u3089\u306a\u3044\u3068\u5b9a\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n<iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgo.dev%2Fref%2Fspec%23Array_types\" title=\"The Go Programming Language Specification - The Go Programming Language\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/go.dev\/ref\/spec#Array_types\">go.dev<\/a><\/cite><\/p>\n<p>\u3053\u306e\u5236\u7d04\u3092\u9006\u624b\u306b\u53d6\u3063\u305f\u306e\u304c\u914d\u5217\u9577\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u3002<\/p>\n<p><code>[X - Y]int<\/code> \u306e\u3088\u3046\u306a\u5f0f\u304c\u914d\u5217\u306e\u9577\u3055\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u308b\u3068\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u305d\u306e\u5024\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n<p>\u3082\u3057\u8a08\u7b97\u7d50\u679c\u304c\u8ca0\u306e\u6570\u306b\u306a\u3063\u305f\u5834\u5408\u3001<code>invalid array length (\u4e0d\u6b63\u306a\u914d\u5217\u9577)<\/code> \u3068\u3044\u3046\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u5931\u6557\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b1 \u306e stringer \u3067\u306f\u3001<code>var x [1]struct{}<\/code> \u3068\u3044\u3046\u9577\u30551\u306e\u914d\u5217\u3092\u5b9a\u7fa9\u3057\u3001<code>_ = x[Placebo-0]<\/code> \u306e\u3088\u3046\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3082\u3057Placebo\u306e\u5024\u304c0\u304b\u3089\u5909\u66f4\u3055\u308c\u308b\u3068\u3001\u914d\u5217\u306e\u5883\u754c\u5916\u30a2\u30af\u30bb\u30b9\u3068\u306a\u308a invalid array index \u30a8\u30e9\u30fc\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u767a\u751f\u3057\u307e\u3059\u3002<br \/>\u3053\u308c\u306b\u3088\u308a\u3001iota\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u5b9a\u6570\u306e\u5024\u304c\u610f\u56f3\u305b\u305a\u5909\u66f4\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b2 \u3067\u306f\u3001<code>unsafe.Sizeof<\/code> \u95a2\u6570\u3067struct\u306ebyte\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/unsafe#Sizeof\">unsafe package &#8211; unsafe &#8211; Go Packages<\/a><\/p>\n<p>Foo\u3068Bar\u306estruct\u304c\u7b49\u3057\u3044\u5834\u5408\u3001\u4e21\u65b9\u3068\u30820\u3068\u306a\u308a\u3001<code>var _ [0]int<\/code> \u3068\u3044\u3046\u6709\u52b9\u306a\u5ba3\u8a00\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001Foo\u3068Bar\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u7570\u306a\u308b\u3068\u3001\u3069\u3061\u3089\u304b\u306e\u5f0f\u304c\u5fc5\u305a\u8ca0\u6570\u306b\u306a\u308b\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p><code>[0]byte<\/code> \u306e\u30b1\u30fc\u30b9\u3067\u306f\u914d\u5217\u306elength\u304c0\u3067\u3042\u308b\u3053\u3068\u3092\u671f\u5f85\u3059\u308b\u306e\u30670\u4ee5\u5916\u3060\u3068\u578b\u4e0d\u4e00\u81f4\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001Foo\u3068Bar\u304c\u7b49\u3057\u3044\u3053\u3068\u3092\u5f37\u5236\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3 id=\"\u4e3b\u306a\u7528\u9014-1\">\u4e3b\u306a\u7528\u9014<\/h3>\n<ul>\n<li>\n<p><strong>iota\u5b9a\u6570\u5024\u306e\u4e0d\u5909\u6027\u4fdd\u8a3c<\/strong> :<br \/>\nstringer\u306e\u3088\u3046\u306b\u3001\u30b3\u30fc\u30c9\u751f\u6210\u304c\u5b9a\u6570\u306e\u7279\u5b9a\u306e\u5024\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u5b9a\u6570\u304c\u5909\u66f4\u3055\u308c\u305f\u969b\u306b\u30b3\u30f3\u30d1\u30a4\u30eb\u3092\u5931\u6557\u3055\u305b\u3001\u958b\u767a\u8005\u306b\u30b3\u30fc\u30c9\u306e\u518d\u751f\u6210\u3092\u4fc3\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u69cb\u9020\u4f53\u306e\u30e1\u30e2\u30ea\u30ec\u30a4\u30a2\u30a6\u30c8\u691c\u8a3c<\/strong> :<br \/>\nunsafe\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u306a\u4f4e\u30ec\u30d9\u30eb\u306a\u30b3\u30fc\u30c9\u3067\u3001\u7279\u5b9a\u306e\u69cb\u9020\u4f53\u304c\u671f\u5f85\u901a\u308a\u306e\u30b5\u30a4\u30ba\u3084\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3092\u6301\u3064\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>enum\u306e\u6700\u5927\u5024\u30c1\u30a7\u30c3\u30af<\/strong> :<br \/>\nenum\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u305f\u5b9a\u6570\u7fa4\u306e\u6700\u5f8c\u306bMaxEnum\u306e\u3088\u3046\u306a\u5b9a\u6570\u3092\u7f6e\u304d\u3001\u305d\u306e\u5024\u304c\u5b9f\u969b\u306e\u8981\u7d20\u6570\u3068\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u3092\u691c\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<h3 id=\"\u5b9f\u88c5\u4f8b-1\">\u5b9f\u88c5\u4f8b<\/h3>\n<p>Go\u88fd\u30b2\u30fc\u30e0\u30a8\u30f3\u30b8\u30f3Ebitengine\u306e\u4e2d\u304b\u3089\u629c\u7c8b\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n<span class=\"synStatement\">const<\/span> (\n    VertexFloatCount = <span class=\"synConstant\">12<\/span>\n)\n\n---\n\n\n<span class=\"synStatement\">type<\/span> Vertex <span class=\"synStatement\">struct<\/span> {\n    \n}\n\n\n\n\n\n\n<span class=\"synStatement\">var<\/span> _ [<span class=\"synConstant\">0<\/span>]<span class=\"synType\">byte<\/span> = [unsafe.Sizeof(Vertex{}) - unsafe.Sizeof(<span class=\"synType\">float32<\/span>(<span class=\"synConstant\">0<\/span>))*graphics.VertexFloatCount]<span class=\"synType\">byte<\/span>{}\n<\/pre>\n<h2 id=\"\u5b9a\u6570\u6f14\u7b97\u3068\u578b\u5b9a\u7fa9\u306b\u3088\u308b\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\">\u5b9a\u6570\u6f14\u7b97\u3068\u578b\u5b9a\u7fa9\u306b\u3088\u308b\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3<\/h2>\n<h3 id=\"\u6a19\u6e96\u7684\u306a\u69cb\u6587-2\">\u6a19\u6e96\u7684\u306a\u69cb\u6587<\/h3>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">const<\/span> X = <span class=\"synConstant\">10<\/span> \n<span class=\"synStatement\">const<\/span> Y = <span class=\"synConstant\">5<\/span>  \n<\/pre>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">type<\/span> Foo <span class=\"synStatement\">struct<\/span>{ F <span class=\"synType\">int64<\/span> }\n<span class=\"synStatement\">type<\/span> Bar <span class=\"synStatement\">struct<\/span>{ F <span class=\"synType\">int64<\/span> }\n\n<span class=\"synStatement\">const<\/span> X = <span class=\"synType\">uint64<\/span>(unsafe.Sizeof(Foo{}))\n<span class=\"synStatement\">const<\/span> Y = <span class=\"synType\">uint64<\/span>(unsafe.Sizeof(Bar{}))\n\n\n\n<span class=\"synStatement\">const<\/span> _, _ <span class=\"synType\">uint64<\/span> = X - Y, Y - X\n<\/pre>\n<p><a target=\"_blank\" href=\"https:\/\/go.dev\/play\/p\/_Oemph1JyU5\">https:\/\/go.dev\/play\/p\/_Oemph1JyU5<\/a><\/p>\n<h3 id=\"\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0-2\">\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0<\/h3>\n<p>\u3053\u306e\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u8ca0\u306e\u5b9a\u6570\u3092\u7b26\u53f7\u306a\u3057\u6574\u6570 (uint) \u578b\u306b\u5909\u63db\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3068\u3044\u3046Go\u306e\u8a00\u8a9e\u4ed5\u69d8\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n<iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgo.dev%2Fref%2Fspec%23Numeric_types\" title=\"The Go Programming Language Specification - The Go Programming Language\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/go.dev\/ref\/spec#Numeric_types\">go.dev<\/a><\/cite><\/p>\n<ul>\n<li>\u30b3\u30f3\u30d1\u30a4\u30e9\u306f const \u5ba3\u8a00\u306e\u53f3\u8fba\u3092\u5b9a\u6570\u5f0f\u3068\u3057\u3066\u8a55\u4fa1\u3057\u307e\u3059\u3002<\/li>\n<li><code>X - Y<\/code> \u3068 <code>Y - X<\/code> \u3068\u3044\u3046\u6f14\u7b97\u304c\u884c\u308f\u308c\u307e\u3059\u3002<\/li>\n<li>\u305d\u306e\u7d50\u679c\u3092 <code>uint64()<\/code> \u3067\u7b26\u53f7\u306a\u3057\u6574\u6570\u306b\u578b\u5909\u63db\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002<\/li>\n<li>\u3082\u3057 <code>X = Y<\/code> \u3067\u3042\u308c\u3070\u3001<code>X - Y<\/code> \u3068 <code>Y - X<\/code> \u306e\u6f14\u7b97\u7d50\u679c\u306f0(\u540c\u5024)\u306b\u306a\u308a uint64 \u3067\u8868\u73fe\u3067\u304d\u308b\u305f\u3081\u30b3\u30f3\u30d1\u30a4\u30eb\u306f\u6210\u529f\u3057\u307e\u3059\u3002<\/li>\n<li>\u3082\u3057 <code>X != Y<\/code> \u3067\u3042\u308c\u3070\u3001<code>X - Y<\/code> \u304b <code>Y - X<\/code> \u3069\u3061\u3089\u304b\u306e\u6f14\u7b97\u7d50\u679c\u304c\u8ca0\u306e\u6570\u306b\u306a\u308a uint64 \u3067\u306f\u8868\u73fe\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f <code>(constant -4 of type uint64) overflows uint64<\/code>\u306e\u3088\u3046\u306a\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\uff08\u3053\u306e\u6587\u8108\u3067\u306f\u30a2\u30f3\u30c0\u30fc\u30d5\u30ed\u30fc\uff09\u30a8\u30e9\u30fc\u3092\u751f\u6210\u3057\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u5931\u6557\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u306f\u3001\u524d\u8ff0\u306e\u300c\u914d\u5217\u9577\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u300d\u306b\u3088\u308b\u7b49\u4fa1\u6027\u691c\u8a3c\u306e\u4ee3\u66ff\u624b\u6cd5\u3067\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3 id=\"\u4e3b\u306a\u7528\u9014-2\">\u4e3b\u306a\u7528\u9014<\/h3>\n<ul>\n<li>\n<p><strong>\u5b9a\u6570\u9593\u306e\u5927\u5c0f\u95a2\u4fc2\u306e\u4fdd\u8a3c<\/strong> :<br \/>\n\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u304c\u30d8\u30c3\u30c0\u30b5\u30a4\u30ba\u4ee5\u4e0a\u3067\u3042\u308b\u3053\u3068\u3084\u3001\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u5024\u304c\u6700\u5c0f\u8a31\u5bb9\u5024\u4ee5\u4e0a\u3067\u3042\u308b\u3053\u3068\u306a\u3069\u3001\u5b9a\u6570\u9593\u306b\u6210\u308a\u7acb\u3064\u3079\u304d\u5927\u5c0f\u95a2\u4fc2\u3092\u9759\u7684\u306b\u691c\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5b9a\u6570\u5024\u306e\u7b49\u4fa1\u6027\u691c\u8a3c<\/strong> :<br \/>\n2\u3064\u306e\u5b9a\u6570\u304c\u540c\u3058\u5024\u3092\u6301\u3064\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<br \/>\u69cb\u9020\u4f53\u306e\u30b5\u30a4\u30ba\u6bd4\u8f03\u3084\u3001\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u306e\u6574\u5408\u6027\u30c1\u30a7\u30c3\u30af\u306a\u3069\u3067\u5229\u7528\u51fa\u6765\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u975e\u8ca0\u5b9a\u6570\u306e\u4fdd\u8a3c<\/strong> :<br \/>\n\u3042\u308b\u5b9a\u6570\u304c0\u4ee5\u4e0a\u3067\u3042\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u5834\u5408\u306b\u3082\u4f7f\u3048\u307e\u3059 (<code>const _ = uint(MyConstant)<\/code>) \u3002<br \/>\n\u4f7f\u3044\u9053\u306f\u30fb\u30fb\u30fb\u3061\u3087\u3063\u3068\u601d\u3044\u3064\u304b\u306a\u3044\u3067\u3059\u306d\u3002<\/p>\n<\/li>\n<\/ul>\n<h3 id=\"\u5b9f\u88c5\u4f8b-2\">\u5b9f\u88c5\u4f8b<\/h3>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n<span class=\"synStatement\">const<\/span> (\n    Pxxx       Class = <span class=\"synStatement\">iota<\/span> \n    PEXTERN                 \n    PAUTO                   \n    PAUTOHEAP               \n    PPARAM                  \n    PPARAMOUT               \n    PTYPEPARAM              \n    PFUNC                   \n\n    \n    _ = <span class=\"synType\">uint<\/span>((<span class=\"synConstant\">1<\/span> 3) - <span class=\"synStatement\">iota<\/span>) <\/pre>\n<h2 id=\"\u30de\u30c3\u30d7\u30ad\u30fc\u91cd\u8907\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\">\u30de\u30c3\u30d7\u30ad\u30fc\u91cd\u8907\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3<\/h2>\n<h3 id=\"\u6a19\u6e96\u7684\u306a\u69cb\u6587-3\">\u6a19\u6e96\u7684\u306a\u69cb\u6587<\/h3>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">const<\/span> (\n    MetricRequestTotal   = <span class=\"synConstant\">\"http_requests_total\"<\/span>\n    MetricRequestErrors  = <span class=\"synConstant\">\"http_requests_errors\"<\/span>\n    MetricRequestLatency = <span class=\"synConstant\">\"http_requests_latency_seconds\"<\/span>\n    \n    \n)\n\n\n_ = <span class=\"synType\">map<\/span>[<span class=\"synType\">string<\/span>]<span class=\"synStatement\">struct<\/span>{}{\n    MetricRequestTotal:   {},\n    MetricRequestErrors:  {},\n    MetricRequestLatency: {},\n    \n}\n<\/pre>\n<h3 id=\"\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0-3\">\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0<\/h3>\n<p>\u4ed6\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u306b\u6bd4\u3079\u308b\u3068\u76f4\u611f\u7684\u3067\u3059\u3002<\/p>\n<p>Go\u306e\u8a00\u8a9e\u4ed5\u69d8\u3067\u306f\u3001\u30de\u30c3\u30d7\u30ea\u30c6\u30e9\u30eb\u5185\u3067\u30ad\u30fc\u304c\u91cd\u8907\u3059\u308b\u3053\u3068\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3068\u5b9a\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n<iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgo.dev%2Fref%2Fspec%23Composite_literals\" title=\"The Go Programming Language Specification - The Go Programming Language\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/go.dev\/ref\/spec#Composite_literals\">go.dev<\/a><\/cite><\/p>\n<p>\u3053\u306e\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u3053\u306e\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6319\u52d5\u3092\u305d\u306e\u307e\u307e\u5229\u7528\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u4e00\u610f\u3067\u3042\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u305f\u3044\u5b9a\u6570\u7fa4\u3092\u30ad\u30fc\u3068\u3057\u3066\u6301\u3064\u30de\u30c3\u30d7\u30ea\u30c6\u30e9\u30eb\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3001\u5024\u306f\u4f55\u3067\u3082\u826f\u3044\u3067\u3059\u304c\u3001\u30e1\u30e2\u30ea\u3092\u6d88\u8cbb\u3057\u306a\u3044 <code>struct{}<\/code> \u304c\u4e00\u822c\u7684\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<\/li>\n<li>\u3082\u3057\u958b\u767a\u8005\u304c\u8aa4\u3063\u30662\u3064\u306e\u5b9a\u6570\u306b\u540c\u3058\u5024\u3092\u5272\u308a\u5f53\u3066\u3066\u3057\u307e\u3046\u3068\u3001\u30de\u30c3\u30d7\u30ea\u30c6\u30e9\u30eb\u5185\u3067\u30ad\u30fc\u304c\u91cd\u8907\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b <code>duplicate key \"...\" in map literal<\/code> \u3068\u3044\u3046\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3 id=\"\u4e3b\u306a\u7528\u9014-3\">\u4e3b\u306a\u7528\u9014<\/h3>\n<ul>\n<li>\n<p><strong>\u8a2d\u5b9a\u30ad\u30fc\u306e\u91cd\u8907\u9632\u6b62<\/strong> :<br \/>\nconfig.yaml \u3084\u74b0\u5883\u5909\u6570\u306a\u3069\u3067\u4f7f\u7528\u3059\u308b\u30ad\u30fc\u6587\u5b57\u5217\u306e\u91cd\u8907\u3092\u9632\u304e\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30e1\u30c8\u30ea\u30af\u30b9\u540d\u3084\u30e9\u30d9\u30eb\u306e\u4e00\u610f\u6027\u4fdd\u8a3c<\/strong> :<br \/>\nPrometheus\u306a\u3069\u306e\u76e3\u8996\u30b7\u30b9\u30c6\u30e0\u3067\u7528\u3044\u308b\u30e1\u30c8\u30ea\u30af\u30b9\u540d\u304c\u91cd\u8907\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>API\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u306e\u30d1\u30b9\u91cd\u8907\u9632\u6b62<\/strong> :<br \/>\nWeb\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306a\u3069\u3067API\u306e\u30d1\u30b9\u3092\u5b9a\u6570\u3068\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u969b\u306b\u3001\u91cd\u8907\u304c\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<h3 id=\"\u5b9f\u88c5\u4f8b-3\">\u5b9f\u88c5\u4f8b<\/h3>\n<p>Protobuf\u306e\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u751f\u6210\u3059\u308bGo\u30b3\u30fc\u30c9\u3067\u306f\u3001enum\u306e\u540d\u524d\u3068\u5024\u306e\u5bfe\u5fdc\u3092\u30de\u30c3\u30d7\u3068\u3057\u3066\u751f\u6210\u3057\u307e\u3059\u304c\u3001\u3053\u308c\u306f\u6697\u9ed9\u7684\u306benum\u5024\u306e\u91cd\u8907\u3092\u9632\u6b62\u3059\u308b\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"code protobuf\" data-lang=\"protobuf\" data-unlink=\"\">syntax = \"proto3\";\n\npackage example;\n\noption go_package = \"example\/userpb\";\n\n\/\/ \u30e6\u30fc\u30b6\u30fc\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u8868\u3059enum\nenum UserStatus {\n  \/\/ \u672a\u6307\u5b9a\n  USER_STATUS_UNSPECIFIED = 0;\n  \/\/ \u6709\u52b9\n  USER_STATUS_ACTIVE = 1;\n  \/\/ \u9000\u4f1a\u6e08\u307f\n  USER_STATUS_DEACTIVATED = 2;\n}<\/pre>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">type<\/span> UserStatus <span class=\"synType\">int32<\/span>\n\n<span class=\"synStatement\">const<\/span> (\n    UserStatus_USER_STATUS_UNSPECIFIED UserStatus = <span class=\"synConstant\">0<\/span>\n    UserStatus_USER_STATUS_ACTIVE      UserStatus = <span class=\"synConstant\">1<\/span>\n    UserStatus_USER_STATUS_DEACTIVATED UserStatus = <span class=\"synConstant\">2<\/span>\n)\n\n\n<span class=\"synStatement\">var<\/span> (\n    UserStatus_name = <span class=\"synType\">map<\/span>[<span class=\"synType\">int32<\/span>]<span class=\"synType\">string<\/span>{\n        <span class=\"synConstant\">0<\/span>: <span class=\"synConstant\">\"USER_STATUS_UNSPECIFIED\"<\/span>,\n        <span class=\"synConstant\">1<\/span>: <span class=\"synConstant\">\"USER_STATUS_ACTIVE\"<\/span>,\n        <span class=\"synConstant\">2<\/span>: <span class=\"synConstant\">\"USER_STATUS_DEACTIVATED\"<\/span>,\n    }\n    UserStatus_value = <span class=\"synType\">map<\/span>[<span class=\"synType\">string<\/span>]<span class=\"synType\">int32<\/span>{\n        <span class=\"synConstant\">\"USER_STATUS_UNSPECIFIED\"<\/span>: <span class=\"synConstant\">0<\/span>,\n        <span class=\"synConstant\">\"USER_STATUS_ACTIVE\"<\/span>:      <span class=\"synConstant\">1<\/span>,\n        <span class=\"synConstant\">\"USER_STATUS_DEACTIVATED\"<\/span>: <span class=\"synConstant\">2<\/span>,\n    }\n)\n<\/pre>\n<h2 id=\"\u30ea\u30f3\u30ab\u30a8\u30e9\u30fc\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\">\u30ea\u30f3\u30ab\u30a8\u30e9\u30fc\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3<\/h2>\n<h3 id=\"\u6a19\u6e96\u7684\u306a\u69cb\u6587-4\">\u6a19\u6e96\u7684\u306a\u69cb\u6587<\/h3>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"C\"<\/span>\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"unsafe\"<\/span>\n\n\n\n<span class=\"synStatement\">func<\/span> assertionFailed()\n\n\n<span class=\"synStatement\">const<\/span> is64bit = unsafe.Sizeof(<span class=\"synType\">uintptr<\/span>(<span class=\"synConstant\">0<\/span>)) == <span class=\"synConstant\">8<\/span>\n\n<span class=\"synStatement\">func<\/span> main() {\n    \n    \n    <span class=\"synStatement\">if<\/span> !is64bit {\n        assertionFailed()\n    }\n}\n<\/pre>\n<p>Go playground\u3067\u306f\u52d5\u304b\u306a\u3044\u306e\u3067\u8a66\u3059\u306a\u3089\u30ed\u30fc\u30ab\u30eb\u3067<\/p>\n<h3 id=\"\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0-4\">\u52d5\u4f5c\u30e1\u30ab\u30cb\u30ba\u30e0<\/h3>\n<p>\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\uff08\u7279\u306b\u30c7\u30c3\u30c9\u30b3\u30fc\u30c9\u9664\u53bb\uff09\u3068\u30ea\u30f3\u30ab\u306e\u30b7\u30f3\u30dc\u30eb\u89e3\u6c7a\u306e\u6319\u52d5\u3092\u610f\u56f3\u7684\u306b\u60aa\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u81ea\u4f53\u304c\u9ed2\u9b54\u8853\u306e\u4e00\u7a2e\u306a\u306e\u3067\u9ed2\u9b54\u8853\u3092\u9ed2\u9b54\u8853\u3067\u9632\u5fa1\u3059\u308b\u3088\u3046\u306a\u5f62\u3067\u3059\u306d\u3002<\/p>\n<h4 id=\"import-C-\u306e\u526f\u4f5c\u7528\"><strong>import &#8220;C&#8221; \u306e\u526f\u4f5c\u7528<\/strong><\/h4>\n<p>\u3053\u306e import \u6587\u306fcgo\u3092\u6709\u52b9\u5316\u3057\u307e\u3059\u304c\u3001\u771f\u306e\u76ee\u7684\u306f\u305d\u306e\u526f\u4f5c\u7528\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u901a\u5e38\u3001Go\u30b3\u30f3\u30d1\u30a4\u30e9\u306fGo\u306e\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u5185\u3067\u5ba3\u8a00\u3055\u308c\u305f\u95a2\u6570\u306b\u306f\u5fc5\u305a\u672c\u4f53\uff08\u5b9f\u88c5\uff09\u304c\u3042\u308b\u3053\u3068\u3092\u8981\u6c42\u3057\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057 import &#8220;C&#8221; \u304c\u5b58\u5728\u3059\u308b\u3068\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u300c\u95a2\u6570\u306e\u5b9f\u88c5\u304c\u5916\u90e8\u306eC\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u300d\u3068\u5224\u65ad\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001assertionFailed \u306e\u3088\u3046\u306b\u672c\u4f53\u3092\u6301\u305f\u306a\u3044\u95a2\u6570\u5ba3\u8a00\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3089\u305a\u306b\u8a31\u5bb9\u3055\u308c\u307e\u3059\u3002<\/p>\n<h4 id=\"\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u5b9a\u6570\u8a55\u4fa1\u3068\u30c7\u30c3\u30c9\u30b3\u30fc\u30c9\u9664\u53bb-DCE\">\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u5b9a\u6570\u8a55\u4fa1\u3068\u30c7\u30c3\u30c9\u30b3\u30fc\u30c9\u9664\u53bb (DCE)<\/h4>\n<p>main \u95a2\u6570\u5185\u306e <code>if !is64bit<\/code> \u3068\u3044\u3046\u6761\u4ef6\u5f0f\u306f\u3001\u5b9a\u6570\u306e\u307f\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a55\u4fa1\u3055\u308c\u307e\u3059\u3002<br \/>\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3053\u306e\u8a55\u4fa1\u7d50\u679c\u306b\u57fa\u3065\u3044\u3066\u6700\u9069\u5316\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<p><strong>\u6761\u4ef6\u304c\u771f\u306e\u5834\u5408 (\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u6210\u529f)<\/strong><\/p>\n<p>  is64bit \u304c true \u306e\u5834\u5408\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3053\u306e if \u30d6\u30ed\u30c3\u30af\u5185\u306e\u30b3\u30fc\u30c9\u304c\u6c7a\u3057\u3066\u5b9f\u884c\u3055\u308c\u306a\u3044\u300c\u30c7\u30c3\u30c9\u30b3\u30fc\u30c9\u300d\u3067\u3042\u308b\u3068\u5224\u65ad\u3057\u307e\u3059\u3002<\/p>\n<p>  \u6700\u9069\u5316\u306e\u4e00\u74b0\u3067\u3042\u308b\u30c7\u30c3\u30c9\u30b3\u30fc\u30c9\u9664\u53bb (Dead Code Elimination) \u306b\u3088\u3063\u3066\u3001assertionFailed() \u3078\u306e\u95a2\u6570\u547c\u3073\u51fa\u3057\u3092\u542b\u3080 if \u30d6\u30ed\u30c3\u30af\u5168\u4f53\u304c\u30d7\u30ed\u30b0\u30e9\u30e0\u304b\u3089\u5b8c\u5168\u306b\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>  \u305d\u306e\u7d50\u679c\u3001\u6700\u7d42\u7684\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d5\u30a1\u30a4\u30eb\u306b\u306f assertionFailed \u3068\u3044\u3046\u30b7\u30f3\u30dc\u30eb\u3078\u306e\u53c2\u7167\u304c\u4e00\u5207\u542b\u307e\u308c\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><strong>\u6761\u4ef6\u304c\u507d\u306e\u5834\u5408 (\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u5931\u6557)<\/strong><\/p>\n<p>  is64bit \u304c false \u306e\u5834\u5408\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3053\u306e if \u30d6\u30ed\u30c3\u30af\u5185\u306e\u30b3\u30fc\u30c9\u3092\u6709\u52b9\u306a\u3082\u306e\u3068\u3057\u3066\u4fdd\u6301\u3057\u307e\u3059\u3002<\/p>\n<p>  \u305d\u306e\u7d50\u679c\u3001assertionFailed() \u3078\u306e\u95a2\u6570\u547c\u3073\u51fa\u3057\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d5\u30a1\u30a4\u30eb\u306b\u6b8b\u308a\u307e\u3059\u3002<\/p>\n<h4 id=\"\u30ea\u30f3\u30ab\u306e\u30b7\u30f3\u30dc\u30eb\u89e3\u6c7a\">\u30ea\u30f3\u30ab\u306e\u30b7\u30f3\u30dc\u30eb\u89e3\u6c7a<\/h4>\n<p>\u30d3\u30eb\u30c9\u30d7\u30ed\u30bb\u30b9\u306e\u6700\u7d42\u6bb5\u968e\u3067\u3001\u30ea\u30f3\u30ab\u306f\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u7d50\u5408\u3057\u3001assertionFailed \u306e\u3088\u3046\u306a\u95a2\u6570\u547c\u3073\u51fa\u3057\uff08\u30b7\u30f3\u30dc\u30eb\u53c2\u7167\uff09\u306b\u5bfe\u5fdc\u3059\u308b\u95a2\u6570\u306e\u5b9a\u7fa9\u3092\u898b\u3064\u3051\u3088\u3046\u3068\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u6210\u529f\u6642<\/strong><\/p>\n<p>  \u524d\u8ff0\u306e\u901a\u308a\u3001assertionFailed \u3078\u306e\u53c2\u7167\u306fDCE\u306b\u3088\u3063\u3066\u524a\u9664\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30ea\u30f3\u30ab\u306e\u4ed5\u4e8b\u306b\u306f\u5f71\u97ff\u305b\u305a\u3001\u30d3\u30eb\u30c9\u306f\u6b63\u5e38\u306b\u5b8c\u4e86\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u5931\u6557\u6642<\/strong><\/p>\n<p>  \u30ea\u30f3\u30ab\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d5\u30a1\u30a4\u30eb\u5185\u306b\u6b8b\u3055\u308c\u305f assertionFailed \u3078\u306e\u53c2\u7167\u3092\u898b\u3064\u3051\u307e\u3059\u304c\u3001\u305d\u306e\u5b9a\u7fa9\u304cGo\u306e\u30b3\u30fc\u30c9\u306b\u3082C\u306e\u30b3\u30fc\u30c9\u306b\u3082\u5b58\u5728\u3057\u306a\u3044\u305f\u3081\u3001\u30b7\u30f3\u30dc\u30eb\u3092\u89e3\u6c7a\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>  \u7d50\u679c\u3068\u3057\u3066\u3001\u30ea\u30f3\u30ab\u306f undefined: main.assertionFailed \u306e\u3088\u3046\u306a\u672a\u89e3\u6c7a\u30b7\u30f3\u30dc\u30eb\u30a8\u30e9\u30fc\u3092\u5831\u544a\u3057\u3001\u30d3\u30eb\u30c9\u30d7\u30ed\u30bb\u30b9\u304c\u5931\u6557\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u4e00\u9023\u306e\u6d41\u308c\u306b\u3088\u308a\u3001is64bit \u3068\u3044\u3046\u6761\u4ef6\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b true \u3067\u3042\u308b\u3053\u3068\u304c\u9759\u7684\u306b\u4fdd\u8a3c\u3055\u308c\u307e\u3059\u3002\u30d3\u30eb\u30c9\u304c\u6210\u529f\u3057\u305f\u3068\u3044\u3046\u4e8b\u5b9f\u305d\u306e\u3082\u306e\u304c\u3001\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u304c\u901a\u3063\u305f\u3053\u3068\u306e\u8a3c\u660e\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3 id=\"\u4e3b\u306a\u7528\u9014-4\">\u4e3b\u306a\u7528\u9014<\/h3>\n<p>\u6b63\u76f4\u306a\u3068\u3053\u308d\u57fa\u672c\u7684\u306b\u4f7f\u3046\u3053\u3068\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u30a2\u30bb\u30f3\u30d6\u30ea\u5b9f\u88c5\u306e\u5834\u5408\u306f <code>import \"C\"<\/code> \u306f\u5fc5\u8981\u306a\u304f\u540c\u3058\u968e\u5c64\u306b <code>xxx.s<\/code> \u3068\u3044\u3046\u30a2\u30bb\u30f3\u30d6\u30ea\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u3082\u540c\u69d8\u306b\u672c\u4f53\u3092\u6301\u305f\u306a\u3044\u95a2\u6570\u5b9a\u7fa9\u3092\u8a31\u5bb9\u3057\u307e\u3059\u3002<\/p>\n<p>runtime\u306e\u4e2d\u3067\u306f\u30a2\u30bb\u30f3\u30d6\u30ea\u5b9f\u88c5\u3057\u3066\u3044\u308b\u7b87\u6240\u304c\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u304c\u3001\u305d\u3053\u3089\u8fba\u3067\u4f7f\u308f\u308c\u3066\u3044\u305f\u3088\u3046\u306a\u30fb\u30fb\u30fb\uff1f<\/p>\n<p><code>\/\/go:linkname<\/code> \u306e\u5834\u5408\u3082\u540c\u69d8\u306b\u672c\u4f53\u3092\u6301\u305f\u306a\u3044\u95a2\u6570\u5b9a\u7fa9\u3092\u8a31\u5bb9\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u30d3\u30eb\u30c9\u74b0\u5883\u306e\u691c\u8a3c<\/strong> :<br \/>\namd64 \u3084 linux \u3068\u3044\u3063\u305f\u7279\u5b9a\u306e\u30d3\u30eb\u30c9\u30bf\u30b0\u3084\u74b0\u5883\u3067\u306e\u307f\u6210\u308a\u7acb\u3064\u3079\u304d\u6761\u4ef6\uff08\u4f8b: unsafe.Sizeof \u306e\u5024\u3001\u69cb\u9020\u4f53\u306e\u30e1\u30e2\u30ea\u30ec\u30a4\u30a2\u30a6\u30c8\uff09\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u8907\u96d1\u306a\u5b9a\u6570\u6761\u4ef6\u306e\u30a2\u30b5\u30fc\u30c8<\/strong> :<br \/>\n\u5358\u7d14\u306a\u56db\u5247\u6f14\u7b97\u3067\u306f\u8868\u73fe\u304c\u96e3\u3057\u3044\u3001\u3088\u308a\u8907\u96d1\u306a\u8ad6\u7406\u95a2\u4fc2\u3092\u6301\u3064\u5b9a\u6570\u6761\u4ef6\u3092\u691c\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u6a5f\u80fd\u30d5\u30e9\u30b0\u306e\u5f37\u5236<\/strong> :<br \/>\n\u30d3\u30eb\u30c9\u6642\u306b\u7279\u5b9a\u306e\u6a5f\u80fd\u30d5\u30e9\u30b0\u306e\u7d44\u307f\u5408\u308f\u305b\u304c\u6709\u52b9\u307e\u305f\u306f\u7121\u52b9\u3067\u3042\u308b\u3053\u3068\u3092\u5f37\u5236\u3057\u3001\u610f\u56f3\u3057\u306a\u3044\u30d3\u30eb\u30c9\u69cb\u6210\u3092\u9632\u304e\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30a2\u30bb\u30f3\u30d6\u30ea\u5b9f\u88c5\u306e\u5f37\u5236<\/strong> :<br \/>\n\u3053\u308c\u306f <code>import \"C\"<\/code>\u304c\u66f8\u304b\u308c\u3066\u3044\u306a\u3044\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u304c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u91cd\u8981\u306a\u51e6\u7406\u306b\u304a\u3044\u3066\u3001\u7279\u5b9a\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u5411\u3051\u306e\u30a2\u30bb\u30f3\u30d6\u30ea\u5b9f\u88c5\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u30d3\u30eb\u30c9\u6642\u306b\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\/\/go:linkname\u306b\u3088\u308b\u5185\u90e8API\u306e\u7d50\u5408\u4fdd\u8a3c<\/strong> :<br \/>\nruntime\u30d1\u30c3\u30b1\u30fc\u30b8\u3068sync\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u3088\u3046\u306b\u3001\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u5185\u90e8\u3067\u5bc6\u63a5\u306b\u9023\u643a\u3059\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u9593\u3067\u3001\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u95a2\u6570\u3084\u5909\u6570\u304c\u6b63\u3057\u304f\u30ea\u30f3\u30af\u3055\u308c\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<h3 id=\"\u5b9f\u88c5\u4f8b-4\">\u5b9f\u88c5\u4f8b<\/h3>\n<p>crypto\u306e\u4e2d\u306b\u3042\u3063\u305f\u6c17\u304c\u3057\u307e\u3057\u305f\u304c\u4eca\u306f\u3082\u3046\u306a\u3044\u3067\u3059\u306d\u3002<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/cs.opensource.google\/go\/go\/+\/refs\/tags\/go1.25.1:src\/crypto\/x509\/internal\/macos\/security.go\">https:\/\/cs.opensource.google\/go\/go\/+\/refs\/tags\/go1.25.1:src\/crypto\/x509\/internal\/macos\/security.go<\/a><\/p>\n<p>\u8981\u3059\u308b\u306b\u3053\u306e\u624b\u6cd5\u306f <strong>\u3082\u3046\u4f7f\u3046\u306a<\/strong> \u3068\u3044\u3046\u4e8b\u306a\u306e\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u7279\u306bpublic\u306b\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30fc\u88fd\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u306e\u9ed2\u9b54\u8853\u306e\u5b9f\u88c5\u306b\u306f\u4e00\u5b9a\u306e\u8cac\u4efb\u304c\u4f34\u3044\u307e\u3059\u3002<\/p>\n<p><code>unsafe.Pointer<\/code> \u3067\u306e\u5b9f\u88c5\u306f runtime error \u306b\u306a\u3063\u3066\u304f\u308c\u308b\u306a\u3089\u307e\u3060\u30de\u30b7\u3067\u3059\u304c\u3001\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u30e1\u30e2\u30ea\u304c\u58ca\u308c\u305f\u72b6\u614b\u3067\u6b63\u5e38\u306b\u52d5\u3044\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u3082\u3042\u308a <strong>\u975e\u5e38\u306b\u5371\u967a<\/strong> \u3067\u3059\u3002<\/p>\n<p>\u5371\u967a\u306a\u5b9f\u88c5\u306b\u306f\u9069\u5207\u306a\u9632\u5fa1\u8853\u3092\u65bd\u884c\u3057\u3066\u3044\u3056\u60f3\u5b9a\u5916\u306e\u72b6\u614b\u306b\u306a\u3063\u305f\u3089\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30b3\u30b1\u308b\u5b89\u5168\u306a\u5b9f\u88c5\u3092\u5fc3\u304c\u3051\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3082\u3061\u308d\u3093\u5fc5\u8981\u304c\u306a\u3044\u9650\u308a\u306f\u4f7f\u308f\u306a\u3044\u306e\u304c\u6700\u5584\u3067\u306f\u3042\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u00a0<\/p>\n<p>\u30a2\u30f3\u30c9\u30d1\u30c3\u30c9\u3067\u306f Go \u306e \u9ed2\u9b54\u8853\u63a2\u7a76\u304c\u5927\u597d\u304d\u306a Gopher \u3092\u52df\u96c6\u3057\u3066\u3044\u307e\u3059\uff01<\/p>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fhrmos.co%2Fpages%2Fandpad%2Fjobs%2F2\" title=\"Product Engineer \/ Engineer of new business\uff08Go\u30e1\u30a4\u30f3\uff09 | \u682a\u5f0f\u4f1a\u793e\u30a2\u30f3\u30c9\u30d1\u30c3\u30c9\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/hrmos.co\/pages\/andpad\/jobs\/2\">hrmos.co<\/a><\/cite><\/p>\n<\/div>\n<p><script>(function(d, s, id) {\n  var js, fjs = d.getElementsByTagName(s)[0];\n  if (d.getElementById(id)) return;\n  js = d.createElement(s); js.id = id;\n  js.src = \"\/\/connect.facebook.net\/ja_JP\/sdk.js#xfbml=1&appId=719729204785177&version=v17.0\";\n  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