{"id":6207,"date":"2025-09-20T02:30:19","date_gmt":"2025-09-20T02:30:19","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=6207"},"modified":"2025-09-20T02:30:19","modified_gmt":"2025-09-20T02:30:19","slug":"iosdc-japan-2025-%e3%82%a2%e3%83%b3%e3%83%89%e3%83%91%e3%83%83%e3%83%89swift%e3%82%af%e3%82%a4%e3%82%ba%e8%a7%a3%e8%aa%ac-day0","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/6207\/","title":{"rendered":"iOSDC Japan 2025 \u30a2\u30f3\u30c9\u30d1\u30c3\u30c9Swift\u30af\u30a4\u30ba\u89e3\u8aac &#8211; Day0"},"content":{"rendered":"\n<\/p>\n<div>\n<p>\u3053\u3093\u306b\u3061\u306f\u3001\u30a2\u30f3\u30c9\u30d1\u30c3\u30c9\u3067iOS\u30a2\u30d7\u30ea\u958b\u767a\u3092\u62c5\u5f53\u3057\u3066\u3044\u308b\u897f <a target=\"_blank\" href=\"https:\/\/x.com\/jrsaruo_tech\">@jrsaruo_tech<\/a> \u3067\u3059\u3002<\/p>\n<p>\u4eca\u5e74\u3082\u3044\u3088\u3044\u3088iOSDC Japan 2025\u304c\u59cb\u307e\u308a\u307e\u3057\u305f\u306d\uff01\u79c1\u306f<a target=\"_blank\" href=\"https:\/\/fortee.jp\/iosdc-japan-2025\/proposal\/324484f6-bc04-4c3d-ada6-f83bab0dd114\">Day2\u306b\u521d\u767b\u58c7<\/a>\u3092\u63a7\u3048\u3066\u304a\u308a\u6c17\u304c\u6c17\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u4eca\u5e74\u306e\u30a2\u30f3\u30c9\u30d1\u30c3\u30c9\u30d6\u30fc\u30b9\u3067\u306fSwift\u30af\u30a4\u30ba\u3092\u51fa\u984c\u3057\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306e5\u56de\u306b\u5206\u3051\u3066\u305d\u308c\u305e\u308c4\u984c\u305a\u3064\u3001\u5408\u8a0820\u984c\u306e\u30af\u30a4\u30ba\u3092\u51fa\u984c\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>Day0 \u2190 \u672c\u8a18\u4e8b<\/li>\n<li>Day1 \u5348\u524d<\/li>\n<li>Day1 \u5348\u5f8c<\/li>\n<li>Day2 \u5348\u524d<\/li>\n<li>Day2 \u5348\u5f8c<\/li>\n<\/ul>\n<p>\u672c\u8a18\u4e8b\u3067\u306fDay0\u306b\u51fa\u984c\u3057\u305f\u30af\u30a4\u30ba4\u984c\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u305e\u308c\u306e\u89e3\u7b54\u3068\u89e3\u8aac\u306f\u30bb\u30af\u30b7\u30e7\u30f3\u3092\u9589\u3058\u3066\u3044\u308b\u306e\u3067\u3001\u307e\u3060\u89e3\u304b\u308c\u3066\u3044\u306a\u3044\u65b9\u306f\u305c\u3072\u30c1\u30e3\u30ec\u30f3\u30b8\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u203b \u30af\u30a4\u30ba\u3067\u4f7f\u7528\u3057\u3066\u3044\u308bSwift\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306f6.1.2\u3001\u8a00\u8a9e\u30e2\u30fc\u30c9\u306f6\u3067\u3059\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">% swift --version   \nswift-driver version: 1.120.5 Apple Swift version 6.1.2 (swiftlang-6.1.2.1.2 clang-1700.0.13.5)\nTarget: arm64-apple-macosx15.0<\/pre>\n<h2 id=\"Q1-\">Q1 \u2605\u2605\u2606\u2606\u2606<\/h2>\n<h3 id=\"\u554f\u984c\">\u554f\u984c<\/h3>\n<p><code>\/* ? *\/<\/code>\u306b\u5f53\u3066\u306f\u307e\u308b\u30b3\u30fc\u30c9\u3068\u3057\u3066\u6b63\u3057\u3044\u3082\u306e\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">sorting<\/span>(_ numbers<span class=\"synSpecial\">:<\/span> <span class=\"synSpecial\">[<\/span><span class=\"synType\">Int<\/span><span class=\"synSpecial\">]<\/span>) <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synSpecial\">[<\/span><span class=\"synType\">Int<\/span><span class=\"synSpecial\">]<\/span> {\n    \n}\n<\/pre>\n<ul>\n<li>\n<p>A<\/p>\n<pre><code class=\"``swift\">  numbers.sorted()\n<\/code><\/pre>\n<\/li>\n<li>\n<p>B<\/p>\n<pre><code class=\"``swift\">  numbers.sort()\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<p><summary>\n\u89e3\u7b54\u3068\u89e3\u8aac<\/p>\n<details\/><\/summary>\n<\/p>\n<h3 id=\"\u89e3\u7b54\">\u89e3\u7b54<\/h3>\n<p>A<\/p>\n<h3 id=\"\u89e3\u8aac\">\u89e3\u8aac<\/h3>\n<p><code>Array<\/code>\u578b\u306e<a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/swift\/array\/sorted()\"><code>sorted()<\/code><\/a>\u3001<a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/swift\/array\/sort()\"><code>sort()<\/code><\/a>\u30e1\u30bd\u30c3\u30c9\u306e\u30b7\u30b0\u30cd\u30c1\u30e3\u306f\u305d\u308c\u305e\u308c\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\">\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">sorted<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synSpecial\">[<\/span><span class=\"synType\">Self.Element<\/span><span class=\"synSpecial\">]<\/span>\n\n\n<span class=\"synStatement\">mutating<\/span> <span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">sort<\/span>()\n<\/pre>\n<p>\u554f\u984c\u306e<code>sorting(_:)<\/code>\u95a2\u6570\u306f\u8fd4\u308a\u5024\u3068\u3057\u3066<code>[Int]<\/code>\u3092\u8fd4\u3059\u306e\u3067\u3001<code>\/* ? *\/<\/code>\u306b\u306f<code>[Int]<\/code>\u3092\u8fd4\u3059<code>sorted()<\/code>\u304c\u5f53\u3066\u306f\u307e\u308a\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u7b54\u3048\u306fA\u3067\u3059\u3002<\/p>\n<p>\u306a\u304aSwift\u306e<a target=\"_blank\" href=\"https:\/\/www.swift.org\/documentation\/api-design-guidelines\/#strive-for-fluent-usage\">API Design Guidelines<\/a>\u3067\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5f79\u5272\u304c\u52d5\u8a5e\u3067\u8868\u73fe\u3055\u308c\u308b\u5834\u5408\u4ee5\u4e0b\u306e\u30eb\u30fc\u30eb\u3067\u547d\u540d\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u81ea\u8eab\u3092\u52a0\u5de5\u3059\u308b\u306a\u3089\uff1a\u52d5\u8a5e\u306e\u547d\u4ee4\u5f62\n<\/li>\n<li>\u81ea\u8eab\u3092\u52a0\u5de5\u3057\u306a\u3044\u306a\u3089\uff1a\n<ul>\n<li>\u76ee\u7684\u8a9e\u3092\u53d6\u3089\u306a\u3044\u306a\u3089\uff1a\u52d5\u8a5e\u306e\u904e\u53bb\u5206\u8a5e\u5f62\uff08<code>-ed<\/code>\uff09\n<\/li>\n<li>\u76ee\u7684\u8a9e\u3092\u53d6\u308b\u306a\u3089\uff1a\u52d5\u8a5e\u306e\u73fe\u5728\u5206\u8a5e\u5f62\uff08<code>-ing<\/code>\uff09\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<blockquote>\n<p>When the operation is naturally described by a verb, <strong>use the verb\u2019s imperative for the mutating method<\/strong> and <strong>apply the \u201ced\u201d or \u201cing\u201d suffix to name its nonmutating counterpart<\/strong>.<\/p>\n<\/blockquote>\n<h2 id=\"Q2-\">Q2 \u2605\u2605\u2606\u2606\u2606<\/h2>\n<h3 id=\"\u554f\u984c-1\">\u554f\u984c<\/h3>\n<p>\u6b21\u306e\u306a\u304b\u3067\u3001<code>\/* ? *\/<\/code>\u306b\u5f53\u3066\u306f\u3081\u308b\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u304c<strong>\u901a\u3089\u306a\u3044<\/strong>\u3082\u306e\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">struct<\/span> <span class=\"synIdentifier\">FooError<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">Error<\/span> {}\n        \n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">foo<\/span>(isFoo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">Bool<\/span>) <span class=\"synStatement\">throws<\/span> {\n    \n    print(<span class=\"synConstant\">\"is foo\"<\/span>)\n}\n<\/pre>\n<ul>\n<li>\n<p>A<\/p>\n<pre><code class=\"``swift\">  guard isFoo else {\n      return\n  }\n<\/code><\/pre>\n<\/li>\n<li>\n<p>B<\/p>\n<pre><code class=\"``swift\">  guard isFoo else {\n      throw FooError()\n  }\n<\/code><\/pre>\n<\/li>\n<li>\n<p>C<\/p>\n<pre><code class=\"``swift\">  guard isFoo else {\n      assertionFailure()\n  }\n<\/code><\/pre>\n<\/li>\n<li>\n<p>D<\/p>\n<pre><code class=\"``swift\">  guard isFoo else {\n      fatalError()\n  }\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<p><summary>\n\u89e3\u7b54\u3068\u89e3\u8aac<\/p>\n<details\/><\/summary>\n<\/p>\n<h3 id=\"\u89e3\u7b54-1\">\u89e3\u7b54<\/h3>\n<p>C<\/p>\n<h3 id=\"\u89e3\u8aac-1\">\u89e3\u8aac<\/h3>\n<p>Swift\u306e<code>guard<\/code>\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002\u4e3b\u306b\u65e9\u671f\u8131\u51fa\u306b\u7528\u3044\u3089\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synStatement\">guard<\/span> shouldBeTrue <span class=\"synStatement\">else<\/span> {\n    \n}\nassert(shouldBeTrue, <span class=\"synConstant\">\"\u3053\u3053\u306b\u5230\u9054\u3059\u308b\u306a\u3089\u5fc5\u305ashouldBeTrue\u304c\u6210\u308a\u7acb\u3063\u3066\u3044\u308b\"<\/span>)\n<\/pre>\n<p><code>guard<\/code>\u69cb\u6587\u306f\u300c<strong>\u6761\u4ef6\u3092\u6e80\u305f\u3057\u305f\u5834\u5408\u306b\u9650\u308a\u5f8c\u7d9a\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3067\u304d\u308b<\/strong>\u300d\u3068\u3044\u3046\u6319\u52d5\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001<code>guard<\/code>\u306e\u6761\u4ef6\u5f0f\u304c<code>false<\/code>\u3068\u306a\u308a<code>else<\/code>\u7bc0\u306b\u5165\u3063\u305f\u5834\u5408\u3001<code>guard<\/code>\u306e\u5f8c\u306b\u7d9a\u304f\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u306a\u3044\u3088\u3046\u4f55\u3089\u304b\u306e\u624b\u6bb5\u3092\u53d6\u308b\u3053\u3068\u304c\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3088\u3063\u3066\u5f37\u5236\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u51e6\u7406\u3092\u7d9a\u884c\u3055\u305b\u306a\u3044\u624b\u6bb5\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li><code>return<\/code>\u3067\u5024\u3092\u8fd4\u3059<\/li>\n<li><code>throw<\/code>\u3067\u30a8\u30e9\u30fc\u3092\u6295\u3052\u308b<\/li>\n<li><code>break<\/code>\u3067\u5206\u5c90\u3084\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u304b\u3089\u629c\u3051\u308b<\/li>\n<li><code>continue<\/code>\u3067\u6b21\u306e\u7e70\u308a\u8fd4\u3057\u9805\u76ee\u306e\u51e6\u7406\u306b\u98db\u3076<\/li>\n<li><a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/swift\/never\"><code>Never<\/code><\/a>\u578b\uff08\u3042\u308b\u3044\u306f\u305d\u308c\u3068\u540c\u3058\u69cb\u9020\u306e\u72ec\u81ea\u578b\uff09\u3092\u8fd4\u3059\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u95a2\u6570\u3092\u547c\u3076\n<ul>\n<li><a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/swift\/preconditionfailure(_:file:line:)\"><code>preconditionFailure<\/code><\/a>\u3001<a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/swift\/fatalerror(_:file:line:)\"><code>fatalError<\/code><\/a>\u3001<code>exit<\/code>\u306a\u3069<\/li>\n<li><code>Never<\/code>\u578b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u4f5c\u308c\u306a\u3044\u306e\u3067\u3001\u4e0a\u8a18\u3092\u547c\u3093\u3060\u6642\u70b9\u3067\u5f8c\u7d9a\u306e\u51e6\u7406\u306f\u78ba\u5b9f\u306b\u5b9f\u884c\u3055\u308c\u306a\u3044\uff08Q3\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\uff09<\/li>\n<\/ul>\n<\/li>\n<li><code>while true {}<\/code>\u3067\u7121\u9650\u30eb\u30fc\u30d7\u3055\u305b\u308b\uff08\u3053\u308c\u3082OK\u306a\u306e\u306f\u9762\u767d\u3044\u3067\u3059\u306d\uff09<\/li>\n<\/ul>\n<p>\u3057\u305f\u304c\u3063\u3066\u9078\u629e\u80a2A\u3001B\u3001D\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3001\u9078\u629e\u80a2C\u306e<a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/swift\/assertionfailure(_:file:line:)\"><code>assertionFailure<\/code><\/a>\u306f\u8fd4\u308a\u5024\u578b\u304c<code>Void<\/code>\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">assertionFailure<\/span>(\n    _ message<span class=\"synSpecial\">:<\/span> <span class=\"synType\">@autoclosure<\/span><span class=\"synSpecial\"> ()<\/span> <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">String<\/span> <span class=\"synIdentifier\">=<\/span> String(),\n    file<span class=\"synSpecial\">:<\/span> <span class=\"synType\">StaticString<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synPreProc\">#file<\/span>,\n    line<span class=\"synSpecial\">:<\/span> <span class=\"synType\">UInt<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synPreProc\">#line<\/span>\n)\n<\/pre>\n<p><code>assertionFailure<\/code>\u306f\u6700\u9069\u5316\u306e\u52b9\u304b\u306a\u3044\u74b0\u5883\uff08<code>-Onone<\/code>\uff09\u3067\u306f\u30af\u30e9\u30c3\u30b7\u30e5\u3057\u307e\u3059\u304c\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u51e6\u7406\u304c\u7d99\u7d9a\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3068\u3044\u3046\u308f\u3051\u3067\u3053\u306e\u30af\u30a4\u30ba\u306e\u7b54\u3048\u306fC\u3067\u3059\u3002<\/p>\n<p>\u4f59\u8ac7\u3067\u3059\u304c\u3001<code>guard<\/code>\u306e\u524d\u3067\u3059\u3067\u306b\u4e0a\u8a18\u306e\u624b\u6bb5\u3067\u8131\u51faor\u7d9a\u884c\u4e0d\u53ef\u306b\u3057\u3066\u3044\u305f\u5834\u5408\u306f<code>else<\/code>\u306e\u4e2d\u3067\u4f55\u3082\u3057\u306a\u304f\u3066\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<code>guard<\/code>\u4ee5\u964d\u306e\u51e6\u7406\u306f\u5fc5\u305a\u5b9f\u884c\u3055\u308c\u306a\u3044\u305f\u3081\u3067\u3059\u3002\u3053\u308c\u3082\u9762\u767d\u3044\u3067\u3059\u306d\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synStatement\">return<\/span>\n<span class=\"synStatement\">guard<\/span> shouldBeTrue <span class=\"synStatement\">else<\/span> {\n    \n}\nassertionFailure(<span class=\"synConstant\">\"shouldBeTrue\u304ctrue\u304b\u3069\u3046\u304b\u306b\u304b\u304b\u308f\u3089\u305a\u3053\u3053\u306b\u306f\u5230\u9054\u3057\u306a\u3044\"<\/span>)\n<\/pre>\n<h2 id=\"Q3-\">Q3 \u2605\u2605\u2605\u2605\u2606<\/h2>\n<h3 id=\"\u554f\u984c-2\">\u554f\u984c<\/h3>\n<p><code>fatalError<\/code>\u95a2\u6570\u306e\u8fd4\u308a\u5024\u578b\u3068\u3057\u3066\u6b63\u3057\u3044\u3082\u306e\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul>\n<li>A: <code>Void<\/code><\/li>\n<li>B: <code>Int<\/code><\/li>\n<li>C: <code>String<\/code><\/li>\n<li>D: <code>Never<\/code><\/li>\n<\/ul>\n<p><summary>\n\u89e3\u7b54\u3068\u89e3\u8aac<\/p>\n<details\/><\/summary>\n<\/p>\n<h3 id=\"\u89e3\u7b54-2\">\u89e3\u7b54<\/h3>\n<p>D<\/p>\n<h3 id=\"\u89e3\u8aac-2\">\u89e3\u8aac<\/h3>\n<p><a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/swift\/fatalerror(_:file:line:)\"><code>fatalError<\/code><\/a>\u95a2\u6570\u306e\u5b9a\u7fa9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">fatalError<\/span>(\n    _ message<span class=\"synSpecial\">:<\/span> <span class=\"synType\">@autoclosure<\/span><span class=\"synSpecial\"> ()<\/span> <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">String<\/span> <span class=\"synIdentifier\">=<\/span> String(),\n    file<span class=\"synSpecial\">:<\/span> <span class=\"synType\">StaticString<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synPreProc\">#file<\/span>,\n    line<span class=\"synSpecial\">:<\/span> <span class=\"synType\">UInt<\/span> <span class=\"synIdentifier\">=<\/span> <span class=\"synPreProc\">#line<\/span>\n) <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">Never<\/span>\n<\/pre>\n<p>\u8fd4\u308a\u5024\u578b\u304c<a target=\"_blank\" href=\"https:\/\/developer.apple.com\/documentation\/swift\/never\"><code>Never<\/code><\/a>\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u306d\u3002\u7b54\u3048\u306fD\u3067\u3059\u3002<\/p>\n<p>\u2026\u3060\u3051\u3067\u306f\u9762\u767d\u304f\u306a\u3044\u306e\u3067\u3001<code>Never<\/code>\u578b\u306b\u3064\u3044\u3066\u3082\u3046\u5c11\u3057\u6398\u308a\u4e0b\u3052\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u306f\u5b9f\u969b\u306e\u5b9a\u7fa9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/github.com\/swiftlang\/swift\/blob\/c987ea9c8e684c219ea41b53d23046549d8a551c\/stdlib\/public\/core\/Policy.swift#L61-L62\">https:\/\/github.com\/swiftlang\/swift\/blob\/c987ea9c8e684c219ea41b53d23046549d8a551c\/stdlib\/public\/core\/Policy.swift#L61-L62<\/a><\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synStatement\">public<\/span> <span class=\"synPreProc\">enum<\/span> <span class=\"synIdentifier\">Never<\/span> {}\n<\/pre>\n<p>\u306a\u3093\u3068\u305f\u3060\u306e\u7a7a\u306e<code>enum<\/code>\u3067\u3059\u3002<\/p>\n<p>\u305f\u3063\u305f\u3053\u308c\u3060\u3051\u306e\u5b9a\u7fa9\u3067\u3059\u304c\u3001\u300c<strong><code>Never<\/code>\u578b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044<\/strong>\u300d\u3068\u3044\u3046\u91cd\u8981\u3067\u8208\u5473\u6df1\u3044\u6027\u8cea\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<code>enum<\/code>\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f<code>case<\/code>\u3092\u6307\u5b9a\u3057\u3066\u4f5c\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u809d\u5fc3\u306e<code>case<\/code>\u304c\u5b58\u5728\u3057\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u6027\u8cea\u3092\u5229\u7528\u3059\u308b\u3068\u69d8\u3005\u306a\u9762\u767d\u3044\u4ed5\u7d44\u307f\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u4e00\u4f8b\u304c\u4eca\u56de\u51fa\u984c\u3057\u305f<code>fatalError<\/code>\u3067\u3059\u3002<\/p>\n<p>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5b58\u5728\u3057\u306a\u3044<code>Never<\/code>\u578b\u3092\u95a2\u6570\u306e\u8fd4\u308a\u5024\u3068\u3059\u308b\u3053\u3068\u3067\u3001\u305d\u306e\u95a2\u6570\u304c<strong>\u5024\u3092\u8fd4\u305b\u306a\u3044<\/strong>\u3001\u3064\u307e\u308a<strong>\u51e6\u7406\u304c\u7d99\u7d9a\u3067\u304d\u306a\u304f\u306a\u308b\u3053\u3068\u3092\u578b\u3067\u8868\u73fe\u3067\u304d\u308b<\/strong>\u306e\u3067\u3059\uff08<code>Void<\/code>\u3068\u306f\u533a\u5225\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u8fd4\u308a\u5024\u304c<code>Void<\/code>\u578b\u306e\u95a2\u6570\u306f\u5024\u3092\u8fd4\u3055\u306a\u3044\u306e\u3067\u306f\u306a\u304f\u3001<code>Void<\/code>\u578b\u552f\u4e00\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b<code>()<\/code>\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\uff09\u3002<\/p>\n<p>\u51e6\u7406\u304c\u7d99\u7d9a\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u306e\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u51e6\u7406\u304c\u6c38\u9060\u306b\u7d42\u4e86\u3057\u306a\u3044\uff08\u7121\u9650\u30eb\u30fc\u30d7\u306a\u3069\uff09<\/li>\n<li>\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u304c\u7d42\u4e86\u3059\u308b<\/li>\n<\/ul>\n<p>\u3053\u308c\u306e\u4f55\u304c\u5b09\u3057\u3044\u304b\u3068\u8a00\u3046\u3068\u3001<strong><code>Never<\/code>\u578b\u3092\u8fd4\u3059\u95a2\u6570\u3092\u547c\u3079\u3070\u305d\u308c\u4ee5\u964d\u306e\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u306a\u3044\u3053\u3068\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u70b9\u3067\u5206\u304b\u308b<\/strong>\u306e\u3067\u3001\u4f8b\u3048\u3070\u5f8c\u7d9a\u306e\u51e6\u7406\u306b<code>Will never be executed<\/code>\u3068\u3044\u3046\u8b66\u544a\u3092\u51fa\u3057\u305f\u308a\u3001Q2\u306e\u9078\u629e\u80a2D\u306e\u3088\u3046\u306b<code>guard<\/code>\u6587\u306e<code>else<\/code>\u7bc0\u3067\u547c\u3076\u3060\u3051\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3092\u901a\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">returnsNever<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">Never<\/span> {\n    <span class=\"synStatement\">while<\/span> <span class=\"synConstant\">true<\/span> {}\n}\nreturnsNever() \nprint(<span class=\"synConstant\">\"\u3053\u3053\u306f\u7d76\u5bfe\u306b\u5b9f\u884c\u3055\u308c\u306a\u3044\"<\/span>) \n<\/pre>\n<p><code>fatalError<\/code>\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u3092\u7d42\u4e86\u3055\u305b\u308b\u306e\u3067<code>Never<\/code>\u578b\u3092\u8fd4\u3059\u95a2\u6570\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u500b\u4eba\u7684\u306b\u306f\u95a2\u6570\u306e\u30b7\u30b0\u30cd\u30c1\u30e3\u304c&#8221;fatalError returns never&#8221;\u3068\u8aad\u3081\u308b\u306e\u3082\u7dba\u9e97\u3060\u306a\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<h2 id=\"Q4-\">Q4 \u2605\u2605\u2605\u2605\u2606<\/h2>\n<h3 id=\"\u554f\u984c-3\">\u554f\u984c<\/h3>\n<p>\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308b\u7d44\u307f\u5408\u308f\u305b\u3068\u3057\u3066\u6b63\u3057\u3044\u3082\u306e\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">protocol<\/span> <span class=\"synIdentifier\">FooProtocol<\/span> {}\n<span class=\"synPreProc\">struct<\/span> <span class=\"synIdentifier\">FooA<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">FooProtocol<\/span> {}\n<span class=\"synPreProc\">struct<\/span> <span class=\"synIdentifier\">FooB<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">FooProtocol<\/span> {}\n\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">makeSomeFoo<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">some<\/span> FooProtocol {\n    FooA()\n}\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">makeAnyFoo<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">any<\/span> FooProtocol {\n    FooB()\n}\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">useSomeFoo<\/span>(_ foo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">some<\/span> FooProtocol) {}\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">useAnyFoo<\/span>(_ foo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">any<\/span> FooProtocol) {}\n\n\nuseSomeFoo(makeSomeFoo())\n\n\nuseSomeFoo(makeAnyFoo())\n\n\nuseAnyFoo(makeSomeFoo())\n\n\nuseAnyFoo(makeAnyFoo())\n<\/pre>\n<ul>\n<li>A: 1, 4<\/li>\n<li>B: 3, 4<\/li>\n<li>C: 1, 3, 4<\/li>\n<li>D: 1, 2, 3, 4<\/li>\n<\/ul>\n<p><summary>\n\u89e3\u7b54\u3068\u89e3\u8aac<\/p>\n<details\/><\/summary>\n<\/p>\n<h3 id=\"\u89e3\u7b54-3\">\u89e3\u7b54<\/h3>\n<p>D<\/p>\n<h3 id=\"\u89e3\u8aac\u306e\u524d\u306b\">\u89e3\u8aac\u306e\u524d\u306b<\/h3>\n<p>\u30af\u30a4\u30ba\u306e\u89e3\u8aac\u306b\u5165\u308b\u524d\u306b\u3001\u307e\u305a\u306f<code>some FooProtocol<\/code>\u3068<code>any FooProtocol<\/code>\u306b\u3064\u3044\u3066\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u305e\u308c\u7406\u89e3\u3055\u308c\u3066\u3044\u308b\u65b9\u306f\u300c\u89e3\u8aac\u300d\u307e\u3067\u8aad\u307f\u98db\u3070\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h4 id=\"some-FooProtocol\"><code>some FooProtocol<\/code><\/h4>\n<p><code>some FooProtocol<\/code>\u306f\u95a2\u6570\u30b7\u30b0\u30cd\u30c1\u30e3\u306e\u3069\u3053\u306b\u73fe\u308c\u308b\u304b\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u610f\u5473\u3092\u6301\u3061\u307e\u3059\u304c\u3001\u3044\u305a\u308c\u3082\u672c\u8cea\u7684\u306a\u7279\u5fb4\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u5171\u901a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong><code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u3089\u304b\u306e\u578b\u3067\u3042\u308b\u3053\u3068<\/strong><\/li>\n<li><strong>\u5177\u4f53\u7684\u306a\u578b\u304c\u4f55\u3067\u3042\u308b\u304b\u306f\u5229\u7528\u8005\u306b\u306f\u5206\u304b\u3089\u306a\u3044\u3053\u3068<\/strong><\/li>\n<li><strong>\u5177\u4f53\u7684\u306a\u578b\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u70b9\u3067\u5b9a\u307e\u308b\u3053\u3068<\/strong><\/li>\n<\/ul>\n<p><code>some FooProtocol<\/code>\u306f\u5358\u306b\u578b\u540d\u3092\u96a0\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3001\u5177\u4f53\u7684\u306a<code>FooA<\/code>\u306a\u3069\u306b\u7f6e\u304d\u63db\u3048\u3066\u3082\u652f\u969c\u304c\u306a\u3044\u3001\u3068\u8003\u3048\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u308c\u3092\u5ff5\u982d\u306b<\/p>\n<ul>\n<li>\u8fd4\u308a\u5024\u306b\u73fe\u308c\u308b<code>some FooProtocol<\/code><\/li>\n<li>\u5f15\u6570\u306b\u73fe\u308c\u308b<code>some FooProtocol<\/code><\/li>\n<\/ul>\n<p>\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h5 id=\"\u8fd4\u308a\u5024\u306b\u73fe\u308c\u308bsome-FooProtocol\">\u8fd4\u308a\u5024\u306b\u73fe\u308c\u308b<code>some FooProtocol<\/code><\/h5>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">makeSomeFoo<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">some<\/span> FooProtocol\n<\/pre>\n<p>\u3053\u308c\u306fOpaque Result Types\u3068\u547c\u3070\u308c\u308b\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n<p><code>makeSomeFoo()<\/code>\u306f<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u3089\u304b\u306e\u578b\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u547c\u3073\u51fa\u3057\u5074\u306b\u306f\u300c<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u304b\u304c\u8fd4\u3055\u308c\u308b\u300d\u3053\u3068\u3057\u304b\u5206\u304b\u3089\u305a\u3001\u5177\u4f53\u7684\u306b<code>FooA<\/code>\u304c\u8fd4\u3055\u308c\u308b\u306e\u304b<code>FooB<\/code>\u304c\u8fd4\u3055\u308c\u308b\u306e\u304b\uff08\u3042\u308b\u3044\u306f\u4ed6\u306e\u578b\u304b\uff09\u306f\u5206\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u5177\u4f53\u7684\u306a\u578b\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u70b9\u3067\u305f\u30601\u3064\u306b\u6c7a\u307e\u308a\u307e\u3059\u3002\u3059\u306a\u308f\u3061\u3001\u547c\u3073\u51fa\u3057\u65b9\u306b\u3088\u3063\u3066\u8fd4\u308a\u5024\u304c<code>FooA<\/code>\u306b\u306a\u3063\u305f\u308a<code>FooB<\/code>\u306b\u306a\u3063\u305f\u308a\u3068\u30b3\u30ed\u30b3\u30ed\u5909\u308f\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3082\u3057<code>FooA<\/code>\u3092\u8fd4\u3059\u95a2\u6570\u306a\u306e\u3060\u3068\u3059\u308c\u3070\u3001<code>some FooProtocol<\/code>\u3092<code>FooA<\/code>\u306b\u7f6e\u304d\u63db\u3048\u3066\u3082\u652f\u969c\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u306e<code>FooA<\/code>\u3092\u96a0\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">makeSomeFoo<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">FooA<\/span> {\n    FooA()\n}\n<\/pre>\n<h5 id=\"\u5f15\u6570\u306b\u73fe\u308c\u308bsome-FooProtocol\">\u5f15\u6570\u306b\u73fe\u308c\u308b<code>some FooProtocol<\/code><\/h5>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">useSomeFoo<\/span>(_ foo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">some<\/span> FooProtocol)\n<\/pre>\n<p>\u3053\u308c\u306f\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u95a2\u6570\u3092\u3088\u308a\u7c21\u6613\u7684\u306b\u66f8\u3051\u308b\u3088\u3046\u306b\u3057\u305f\u30b7\u30f3\u30bf\u30c3\u30af\u30b9\u30b7\u30e5\u30ac\u30fc\u3067\u3001\u4ee5\u4e0b\u3068\u7b49\u4fa1\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">useSomeFoo<\/span><span class=\"synSpecial\"><span class=\"synIdentifier\">Foo<\/span><span class=\"synSpecial\">&gt;<\/span>(_ foo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">Foo<\/span>) <span class=\"synStatement\">where<\/span> Foo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">FooProtocol<\/span>\n<\/span><\/pre>\n<p><code>useSomeFoo(_:)<\/code>\u306f<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u3089\u304b\u306e\u578b\u306e\u5024\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<\/p>\n<p><code>useSomeFoo(_:)<\/code>\u306b\u3068\u3063\u3066\u306f\u300c<code>foo<\/code>\u304c<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u304b\u3067\u3042\u308b\u300d\u3053\u3068\u3057\u304b\u5206\u304b\u3089\u305a\u3001\u5177\u4f53\u7684\u306b<code>FooA<\/code>\u304c\u6e21\u3055\u308c\u308b\u306e\u304b<code>FooB<\/code>\u304c\u6e21\u3055\u308c\u308b\u306e\u304b\u306f\u5206\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u5177\u4f53\u7684\u306b\u3069\u3093\u306a\u578b\u306e\u5024\u304c\u6e21\u3055\u308c\u305f\u306e\u304b\u3092\u77e5\u3063\u3066\u3044\u308b\u306e\u3067\u3001\uff08\u7279\u6b8a\u5316\u3068\u547c\u3070\u308c\u308b\u6700\u9069\u5316\u304c\u52b9\u3051\u3070\uff09<code>foo<\/code>\u3092<code>FooA<\/code>\u578b\u3060\u3068\u5206\u304b\u3063\u305f\u3046\u3048\u3067\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\">useSomeFoo(FooA()) \nuseSomeFoo(FooB()) \n<\/pre>\n<p><code>FooA<\/code>\u3092\u53d7\u3051\u53d6\u308b\u3088\u3046\u306a\u30b3\u30fc\u30c9\u306b\u304a\u3044\u3066\u306f\u3001<code>some FooProtocol<\/code>\u3092<code>FooA<\/code>\u3068\u66f8\u304d\u63db\u3048\u3066\u3082\u652f\u969c\u304c\u3042\u308a\u307e\u305b\u3093\uff08\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3088\u308b\u6700\u9069\u5316\u304c\u52b9\u3051\u3070\u5b9f\u969b\u306b\u3053\u306e\u3088\u3046\u306a\u95a2\u6570\u304c\u751f\u6210\u3055\u308c\u307e\u3059\uff09\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">useSomeFoo<\/span>(_ foo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">FooA<\/span>) {}\nuseSomeFoo(FooA())\n<\/pre>\n<h4 id=\"any-FooProtocol\"><code>any FooProtocol<\/code><\/h4>\n<p>\u3053\u308c\u306fExistential Types\u3068\u547c\u3070\u308c\u308b\u578b\u3067\u3059\u3002<\/p>\n<p>\u300c<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u578b\u306e\u5024\u306a\u3089\u4f55\u3067\u3082\u5165\u308c\u3089\u308c\u308b\u7bb1\u300d\u3060\u3068\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u300c\u7bb1\u300d\u306e\u4e2d\u306b\u4f55\u304c\u5165\u3063\u3066\u3044\u308b\u304b\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u70b9\u3067\u306f\u5206\u304b\u308a\u307e\u305b\u3093\u304c\u3001\u4e2d\u8eab\u304c<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u3066\u3044\u308b\u3053\u3068\u3060\u3051\u306f\u78ba\u304b\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\">\n\n\n\n\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">makeAnyFoo<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">any<\/span> FooProtocol\n\n\n\n\n\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">useAnyFoo<\/span>(_ foo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">any<\/span> FooProtocol)\n<\/pre>\n<p>\u4f55\u3067\u3082\u5165\u308c\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u4fbf\u5229\u306a\u53cd\u9762\u3001\u30e1\u30e2\u30ea\u5229\u7528\u3084\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306a\u3069\u306b\u304a\u3044\u3066\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><code>any FooProtocol<\/code>\u3092<code>FooA<\/code>\u3084<code>FooB<\/code>\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<code>any FooProtocol<\/code>\u306f\u305d\u308c\u3089\u3092\u5165\u308c\u3089\u308c\u308b\u300c\u7bb1\u300d\u3067\u3042\u308a\u3001<code>FooA<\/code>\u3084<code>FooB<\/code>\u305d\u306e\u3082\u306e\u3068\u306f\u7570\u306a\u308b\u578b\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">foos<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synSpecial\">[<\/span><span class=\"synType\">any FooProtocol<\/span><span class=\"synSpecial\">]<\/span> <span class=\"synIdentifier\">=<\/span> [FooA(), FooB()]\n<span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">foos<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synSpecial\">[<\/span><span class=\"synType\">FooA<\/span><span class=\"synSpecial\">]<\/span> <span class=\"synIdentifier\">=<\/span> [FooA(), FooB()] \n<\/pre>\n<p>\u666e\u6bb5\u4f7f\u3044\u306b\u304a\u3044\u3066\u306f\u3056\u3063\u304f\u308a<\/p>\n<ul>\n<li><code>some FooProtocol<\/code>\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u826f\u3044\u304c\u5236\u9650\u304c\u5f37\u3081<\/li>\n<li><code>any FooProtocol<\/code>\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u843d\u3061\u308b\u5206\u81ea\u7531\u5ea6\u304c\u9ad8\u304f\u306a\u308b<\/li>\n<\/ul>\n<p>\u304f\u3089\u3044\u306e\u7406\u89e3\u3067\u3082OK\u3067\u3059\u3002<\/p>\n<h3 id=\"\u89e3\u8aac-3\">\u89e3\u8aac<\/h3>\n<p>\u524d\u63d0\u304c\u304b\u306a\u308a\u9577\u304f\u306a\u308a\u307e\u3057\u305f\u304c\u3001\u4ee5\u4e0a\u3092\u8e0f\u307e\u3048\u30661\u301c4\u306e\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4 id=\"1-useSomeFoomakeSomeFooOK\">1. <code>useSomeFoo(makeSomeFoo())<\/code>\uff1aOK<\/h4>\n<p><code>makeSomeFoo()<\/code>\u306f<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u304b\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p><code>useSomeFoo(_:)<\/code>\u306f<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u304b\u3092\u53d7\u3051\u53d6\u308c\u307e\u3059\u3002<\/p>\n<p><code>useSomeFoo(_:)<\/code>\u306e\u5f15\u6570\u306b<code>makeSomeFoo()<\/code>\u306e\u8fd4\u308a\u5024\u3092\u6e21\u3057\u3066\u3082\u578b\u306f\u7834\u7dbb\u3057\u306a\u3044\u306e\u3067\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b2\u3064\u306e\u95a2\u6570\u306e<code>FooA<\/code>\u304c\u96a0\u3055\u308c\u305f\u3060\u3051\u3001\u3068\u8003\u3048\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">makeSomeFoo<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">FooA<\/span>\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">useSomeFoo<\/span>(_ foo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">FooA<\/span>)\n<\/pre>\n<h4 id=\"2-useSomeFoomakeAnyFooOK\">2. <code>useSomeFoo(makeAnyFoo())<\/code>\uff1aOK<\/h4>\n<p>\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u3001\u3053\u308c\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u306f\u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306eSwift\u3067\u306f\u901a\u3089\u306a\u304b\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u4ee5\u4e0b\u306e\u30d7\u30ed\u30dd\u30fc\u30b6\u30eb\u304c\u63a1\u7528\u3055\u308c\u3066\u901a\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/github.com\/swiftlang\/swift-evolution\/blob\/main\/proposals\/0352-implicit-open-existentials.md\">SE-0352: Implicitly Opened Existentials<\/a><\/p>\n<p><code>useSomeFoo(_:)<\/code>\u306f<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u304b\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<code>makeAnyFoo()<\/code>\u306e\u8fd4\u308a\u5024\u306f<code>any FooProtocol<\/code>\u3068\u3044\u3046\u300c\u7bb1\u300d\u3067\u3042\u308a\u3001\u3053\u306e\u300c\u7bb1\u300d\u81ea\u4f53\u306f<code>FooProtocol<\/code>\u306b\u306f\u9069\u5408\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u304b\u3064\u3066\u306f<code>any FooProtocol<\/code>\u306a\u5024\u3092<code>useSomeFoo(_:)<\/code>\u306b\u6e21\u3059\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001Swift 5.7\u3067\u300c<code>any FooProtocol<\/code>\u3068\u3044\u3046\u300e\u7bb1\u300f\u304b\u3089\u4e2d\u8eab\u3092\u53d6\u308a\u51fa\u3057\u3066\u3001<code>some FooProtocol<\/code>\u3092\u53d7\u3051\u53d6\u308b\u95a2\u6570\u306b\u6e21\u305b\u308b\u3088\u3046\u306b\u3059\u308b\u300d\u3068\u3044\u3046\u6a5f\u80fd\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\uff08\u53b3\u5bc6\u306b\u306fSwift 5\u7cfb\u3067\u306fupcoming feature flag\u3067\u6a5f\u80fd\u3092\u6709\u52b9\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\uff09\u3002<\/p>\n<p><code>any FooProtocol<\/code>\u3068\u3044\u3046\u300c\u7bb1\u300d\u306e\u4e2d\u306b\u306f<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u304b\u304c\u5165\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u53d6\u308a\u51fa\u3057\u3066\u3057\u307e\u3048\u3070<code>some FooProtocol<\/code>\u3068\u3057\u3066\u6271\u3048\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u6982\u5ff5\u3092\u64ec\u4f3c\u30b3\u30fc\u30c9\u3067\u793a\u3059\u3068\u3053\u3093\u306a\u611f\u3058\u3067\u3059\uff1a<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\">\n<span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">anyFoo<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">any<\/span> FooProtocol <span class=\"synIdentifier\">=<\/span> makeAnyFoo()\n\n\n<span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">concreteFoo<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">some<\/span> FooProtocol <span class=\"synIdentifier\">=<\/span> <span class=\"synStatement\">open<\/span>(anyFoo) \n\n\nuseSomeFoo(concreteFoo)\n<\/pre>\n<h4 id=\"3-useAnyFoomakeSomeFooOK\">3. <code>useAnyFoo(makeSomeFoo())<\/code>\uff1aOK<\/h4>\n<p>\u524d\u63d0\u3068\u3057\u3066\u3001<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u578b\u306e\u5024\u306f<code>any FooProtocol<\/code>\u578b\u306e\u5909\u6570\u306b\u76f4\u63a5\u4ee3\u5165\u53ef\u80fd\u3067\u3059\u3002\u81ea\u52d5\u3067\u300c\u7bb1\u300d\u306b\u5305\u3093\u3067\u304f\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u95a2\u6570\u306e\u5f15\u6570\u306b\u6e21\u3059\u3068\u304d\u3082\u540c\u69d8\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">let<\/span> <span class=\"synIdentifier\">anyFoo<\/span><span class=\"synSpecial\">:<\/span> <span class=\"synType\">any<\/span> FooProtocol <span class=\"synIdentifier\">=<\/span> FooA() \nuseAnyFoo(FooA()) \n<\/pre>\n<p><code>makeSomeFoo()<\/code>\u306f<code>FooProtocol<\/code>\u306b\u9069\u5408\u3057\u305f\u4f55\u304b\u3092\u8fd4\u3059\u306e\u3067\u3001\u305d\u306e\u8fd4\u308a\u5024\u306f<code>useAnyFoo(_:)<\/code>\u306b\u76f4\u63a5\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u4ee5\u4e0b\u306e<code>makeSomeFoo()<\/code>\u306e<code>FooA<\/code>\u304c\u96a0\u3055\u308c\u305f\u3060\u3051\u3001\u3068\u8003\u3048\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u3002<\/p>\n<pre class=\"code lang-swift\" data-lang=\"swift\" data-unlink=\"\"><span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">makeSomeFoo<\/span>() <span class=\"synSpecial\">-&gt;<\/span> <span class=\"synType\">FooA<\/span>\n<span class=\"synPreProc\">func<\/span> <span class=\"synIdentifier\">useAnyFoo<\/span>(_ foo<span class=\"synSpecial\">:<\/span> <span class=\"synType\">any<\/span> FooProtocol)\n<\/pre>\n<h4 id=\"4-useAnyFoomakeAnyFooOK\">4. <code>useAnyFoo(makeAnyFoo())<\/code>\uff1aOK<\/h4>\n<p>\u3053\u308c\u306f\u3082\u3046\u305d\u306e\u307e\u307e\u3067\u3059\u306d\u3002<code>makeAnyFoo()<\/code>\u306f<code>any FooProtocol<\/code>\u3068\u3044\u3046\u300c\u7bb1\u300d\u3092\u8fd4\u3057\u3001<code>useAnyFoo(_:)<\/code>\u306f\u305d\u306e\u300c\u7bb1\u300d\u3092\u305d\u306e\u307e\u307e\u53d7\u3051\u53d6\u308c\u308b\u306e\u3067\u3001\u3053\u308c\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0a\u304b\u3089\u3053\u306e\u30af\u30a4\u30ba\u306e\u7b54\u3048\u306fD\u306e1, 2, 3, 4\u3001\u3064\u307e\u308a\u3059\u3079\u3066\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308b\u3001\u3067\u3057\u305f\u3002<\/p>\n<p>\u9577\u304f\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u304c\u3001\u3053\u3053\u307e\u3067\u8aad\u3093\u3067\u304f\u3060\u3055\u308a\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>Day0\u306e\u30af\u30a4\u30ba\u306f\u697d\u3057\u3093\u3067\u3044\u305f\u3060\u3051\u305f\u3067\u3057\u3087\u3046\u304b\uff1f\u611f\u60f3\u7b49\u3082\u304a\u5f85\u3061\u3057\u3066\u304a\u308a\u307e\u3059\uff01<\/p>\n<p>\u660e\u65e5\u4ee5\u964d\u3082Day1\u5348\u524d\u3001Day1\u5348\u5f8c\u3001\u2026\u3068\u30af\u30a4\u30ba\u304c\u66f4\u65b0\u3055\u308c\u3066\u3044\u304f\u306e\u3067\u305c\u3072\u307e\u305f\u30a2\u30f3\u30c9\u30d1\u30c3\u30c9\u30d6\u30fc\u30b9\u307e\u3067\u904a\u3073\u306b\u304d\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>Day2\u306b\u306fTrack B\u306b\u306611:25\u3088\u308a\u300e<a target=\"_blank\" href=\"https:\/\/fortee.jp\/iosdc-japan-2025\/proposal\/324484f6-bc04-4c3d-ada6-f83bab0dd114\">\u30cd\u30a4\u30c6\u30a3\u30d6\u88fd\u30ac\u30f3\u30c8\u30c1\u30e3\u30fc\u30c8UI\u3092\u4f5c\u3063\u3066\u5b66\u3076UICollectionViewLayout\u306e\u5a01\u529b<\/a>\u300f\u3068\u3044\u3046\u30bf\u30a4\u30c8\u30eb\u3067\u767b\u58c7\u3057\u307e\u3059\u306e\u3067\u3001\u305d\u3061\u3089\u3082\u305c\u3072\u304a\u8d8a\u3057\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Ffortee.jp%2Fiosdc-japan-2025%2Fproposal%2F324484f6-bc04-4c3d-ada6-f83bab0dd114\" title=\"\u30cd\u30a4\u30c6\u30a3\u30d6\u88fd\u30ac\u30f3\u30c8\u30c1\u30e3\u30fc\u30c8UI\u3092\u4f5c\u3063\u3066\u5b66\u3076UICollectionViewLayout\u306e\u5a01\u529b\" 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 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href=\"https:\/\/fortee.jp\/iosdc-japan-2025\/proposal\/ecccc3fc-9aff-4c2f-b050-81da240dc680\">fortee.jp<\/a><\/cite><\/p>\n<p>\u305d\u308c\u3067\u306f3\u65e5\u9593\u697d\u3057\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/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  fjs.parentNode.insertBefore(js, fjs);\n}(document, 'script', 'facebook-jssdk'));<\/script><br \/>\n<br \/>\n<br \/><a href=\"https:\/\/tech.andpad.co.jp\/entry\/2025\/09\/20\/100000\">\u5143\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3059\u308b <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"\u3053\u3093\u306b\u3061\u306f\u3001\u30a2\u30f3\u30c9\u30d1\u30c3\u30c9\u3067iOS\u30a2\u30d7\u30ea\u958b\u767a\u3092\u62c5\u5f53\u3057\u3066\u3044\u308b\u897f @jrsaruo_tech \u3067\u3059\u3002 \u4eca\u5e74\u3082\u3044\u3088\u3044\u3088iOSDC Japan 2025\u304c\u59cb\u307e\u308a\u307e\u3057\u305f\u306d\uff01\u79c1\u306fDay2\u306b\u521d\u767b\u58c7\u3092\u63a7\u3048\u3066\u304a\u308a\u6c17\u304c\u6c17\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u4eca\u5e74 [&hellip;]","protected":false},"author":1,"featured_media":6208,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-6207","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-company-tec"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>iOSDC Japan 2025 \u30a2\u30f3\u30c9\u30d1\u30c3\u30c9Swift\u30af\u30a4\u30ba\u89e3\u8aac - Day0 - \u30dd\u30b1\u30b3\u30f3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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