{"id":44963,"date":"2023-04-04T01:10:47","date_gmt":"2024-02-07T07:51:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/44963-2\/"},"modified":"2024-04-29T21:48:26","modified_gmt":"2024-04-29T13:48:26","slug":"44963-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/44963-2\/","title":{"rendered":""},"content":{"rendered":"<p>\u3053\u308c\u3092\u898b\u3066\u3001\u306a\u308b\u307b\u3069\u3001\u3068\u601d\u3063\u305f\u306e\u3067\u66f8\u3044\u3066\u307f\u308b\u3053\u3068\u306b\u3057\u305f\u3002<\/p>\n<h2>\u30d1\u30bf\u30fc\u30f3\uff11 \u307e\u305a\u306f\u81ea\u5206\u306a\u308a\u306b\u66f8\u3044\u3066\u307f\u308b<\/h2>\n<p>Fizz\u3068Buzz\u3068FizzBuzz\u3092\u305d\u308c\u305e\u308c\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8003\u3048\u308b<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Fizz<\/ul>\n<\/li>\n<\/ul>\n<p>3\u3067\u5272\u308a\u5207\u308c\u308b\u306a\u3089Fizz\u3063\u3066\u3044\u3046\u4eba<\/p>\n<p>Buzz<\/p>\n<p>5\u3067\u5272\u308a\u5207\u308c\u308b\u306a\u3089Buzz\u3063\u3066\u3044\u3046\u4eba<\/p>\n<p>FizzBuzz<\/p>\n<p>Fizz\u3068Buzz\u306e\u7d44\u307f\u5408\u308f\u305b<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">pub<\/span> <span class=\"k\">struct<\/span> <span class=\"n\">Fizz<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">values<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span><span class=\"nb\">Option<\/span><span class=\"o\">&lt;&amp;<\/span><span class=\"nv\">'static<\/span> <span class=\"nb\">str<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">;<\/span> <span class=\"mi\">3<\/span><span class=\"p\">],<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">impl<\/span> <span class=\"n\">Fizz<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">new<\/span><span class=\"p\">()<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"n\">Fizz<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">Fizz<\/span> <span class=\"p\">{<\/span> <span class=\"n\">values<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span><span class=\"nf\">Some<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Fizz\"<\/span><span class=\"p\">),<\/span> <span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">]<\/span> <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">get<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">,<\/span> <span class=\"n\">i<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">Option<\/span><span class=\"o\">&lt;&amp;<\/span><span class=\"nv\">'static<\/span> <span class=\"nb\">str<\/span><span class=\"o\">&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">self<\/span><span class=\"py\">.values<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"o\">%<\/span><span class=\"mi\">3<\/span><span class=\"p\">]<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">pub<\/span> <span class=\"k\">struct<\/span> <span class=\"n\">Buzz<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">values<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span><span class=\"nb\">Option<\/span><span class=\"o\">&lt;&amp;<\/span><span class=\"nv\">'static<\/span> <span class=\"nb\">str<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">;<\/span> <span class=\"mi\">5<\/span><span class=\"p\">],<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">impl<\/span> <span class=\"n\">Buzz<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">new<\/span><span class=\"p\">()<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"n\">Buzz<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">Buzz<\/span> <span class=\"p\">{<\/span> <span class=\"n\">values<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span><span class=\"nf\">Some<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Buzz\"<\/span><span class=\"p\">),<\/span> <span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">]<\/span> <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">get<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">,<\/span> <span class=\"n\">i<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">Option<\/span><span class=\"o\">&lt;&amp;<\/span><span class=\"nv\">'static<\/span> <span class=\"nb\">str<\/span><span class=\"o\">&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">self<\/span><span class=\"py\">.values<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"o\">%<\/span><span class=\"mi\">5<\/span><span class=\"p\">]<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">fizz<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">Fizz<\/span><span class=\"p\">::<\/span><span class=\"nf\">new<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">buzz<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">Buzz<\/span><span class=\"p\">::<\/span><span class=\"nf\">new<\/span><span class=\"p\">();<\/span>\r\n\r\n    <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"n\">in<\/span> <span class=\"mi\">1<\/span><span class=\"o\">..<\/span><span class=\"mi\">50<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">match<\/span> <span class=\"p\">(<\/span><span class=\"n\">fizz<\/span><span class=\"nf\">.get<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span><span class=\"p\">),<\/span> <span class=\"n\">buzz<\/span><span class=\"nf\">.get<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span><span class=\"p\">))<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"p\">(<\/span><span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">i<\/span><span class=\"p\">),<\/span>\r\n            <span class=\"p\">(<\/span><span class=\"n\">fizz<\/span><span class=\"p\">,<\/span> <span class=\"n\">buzz<\/span><span class=\"p\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">fizz<\/span><span class=\"nf\">.unwrap_or_default<\/span><span class=\"p\">(),<\/span> <span class=\"n\">buzz<\/span><span class=\"nf\">.unwrap_or_default<\/span><span class=\"p\">()),<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5272\u308a\u5207\u308c\u308b\u304b\u3069\u3046\u304b\u3001\u3067\u306f\u306a\u304f\u3066\u3001\u5270\u4f59\u3092index\u3068\u3057\u3066\u4f7f\u3044\u305f\u304b\u3063\u305f\u306e\u3067\u3001\u914d\u5217\u3068\u3057\u3066\u6301\u3063\u3066\u3044\u308b\u3002<\/p>\n<p>\u672c\u5f53\u306f\u5b9a\u6570\u3068\u3057\u3066\u3001\u69cb\u9020\u4f53\u306efield\u306b\u6301\u3063\u3066 Buzz::get(i) \u306e\u3088\u3046\u306a\u611f\u3058\u306b\u3057\u305f\u304b\u3063\u305f\u3051\u3069\u3001<br \/>\n\u69cb\u9020\u4f53\u306e\u4e2d\u3067 static \u3084 const \u306f\u3067\u304d\u306a\u3044\u3089\u3057\u3044\u3002<br \/>\n[\u4fee\u6b63] 1.20(stable)\u4ee5\u964d\u3067\u306fAssociated const\u3067\u5b9f\u73fe\u3067\u304d\u308b<\/p>\n<p>\u3084\u308b\u3068\u3057\u305f\u3089\u3001\u3053\u3093\u306a\u611f\u3058\u3060\u308d\u3046\u304b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">const<\/span> <span class=\"n\">FIZZ_VALUES<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span><span class=\"nb\">Option<\/span><span class=\"o\">&lt;&amp;<\/span><span class=\"nv\">'static<\/span> <span class=\"nb\">str<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">;<\/span> <span class=\"mi\">3<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[<\/span><span class=\"nf\">Some<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Fizz\"<\/span><span class=\"p\">),<\/span> <span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">];<\/span>\r\n<span class=\"k\">const<\/span> <span class=\"n\">BUZZ_VALUES<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span><span class=\"nb\">Option<\/span><span class=\"o\">&lt;&amp;<\/span><span class=\"nv\">'static<\/span> <span class=\"nb\">str<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">;<\/span> <span class=\"mi\">5<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[<\/span><span class=\"nf\">Some<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Buzz\"<\/span><span class=\"p\">),<\/span> <span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">];<\/span>\r\n\r\n<span class=\"k\">pub<\/span> <span class=\"k\">struct<\/span> <span class=\"n\">Fizz<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">impl<\/span> <span class=\"n\">Fizz<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">get<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">Option<\/span><span class=\"o\">&lt;&amp;<\/span><span class=\"nv\">'static<\/span> <span class=\"nb\">str<\/span><span class=\"o\">&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">FIZZ_VALUES<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"o\">%<\/span><span class=\"mi\">3<\/span><span class=\"p\">]<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">pub<\/span> <span class=\"k\">struct<\/span> <span class=\"n\">Buzz<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">impl<\/span> <span class=\"n\">Buzz<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">get<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">Option<\/span><span class=\"o\">&lt;&amp;<\/span><span class=\"nv\">'static<\/span> <span class=\"nb\">str<\/span><span class=\"o\">&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">BUZZ_VALUES<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"o\">%<\/span><span class=\"mi\">5<\/span><span class=\"p\">]<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"nd\">#[cfg(test)]<\/span>\r\n<span class=\"k\">mod<\/span> <span class=\"n\">tests<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">use<\/span> <span class=\"nn\">super<\/span><span class=\"p\">::<\/span><span class=\"o\">*<\/span><span class=\"p\">;<\/span>\r\n\r\n    <span class=\"nd\">#[test]<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">fizzbuzz<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">for<\/span> <span class=\"n\">i<\/span> <span class=\"n\">in<\/span> <span class=\"mi\">1<\/span><span class=\"o\">..<\/span><span class=\"mi\">50<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"k\">match<\/span> <span class=\"p\">(<\/span><span class=\"nn\">Fizz<\/span><span class=\"p\">::<\/span><span class=\"nf\">get<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span><span class=\"p\">),<\/span> <span class=\"nn\">Buzz<\/span><span class=\"p\">::<\/span><span class=\"nf\">get<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span><span class=\"p\">))<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"p\">(<\/span><span class=\"nb\">None<\/span><span class=\"p\">,<\/span> <span class=\"nb\">None<\/span><span class=\"p\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">i<\/span><span class=\"p\">),<\/span>\r\n                <span class=\"p\">(<\/span><span class=\"n\">fizz<\/span><span class=\"p\">,<\/span> <span class=\"n\">buzz<\/span><span class=\"p\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">fizz<\/span><span class=\"nf\">.unwrap_or_default<\/span><span class=\"p\">(),<\/span> <span class=\"n\">buzz<\/span><span class=\"nf\">.unwrap_or_default<\/span><span class=\"p\">()),<\/span>\r\n            <span class=\"p\">}<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u30d1\u30bf\u30fc\u30f3\uff12<\/h2>\n<p>\u5192\u982d\u3067\u89e6\u308c\u305f\u8a18\u4e8b\u306e\u30c8\u30ec\u30a4\u30c8\u306e\u4f7f\u3044\u65b9\u306b\u306a\u308b\u307b\u3069\u611f\u304c\u3042\u3063\u305f\u306e\u3067\u3001\u30de\u30cd\u3057\u3066\u307f\u308b\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Fizz\u3068Buzz\u306f\u3001\u540c\u3058\u7a2e\u985e\u3068\u8003\u3048\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>\u3064\u307e\u308aEnum\u3060<\/p>\n<p>Fizz(Buzz)\u304c\u3069\u3046\u767a\u8a00\u3059\u308b\u304b<\/p>\n<p>\u3064\u307e\u308a\u3001Display\u30c8\u30ec\u30a4\u30c8\u3060<\/p>\n<p>i\u304c\u3069\u3046\u3044\u3046\u6642\u306b\u3001Fizz\u306b\u306a\u308b\u304b\u3001Buzz\u306b\u306a\u308b\u304b<\/p>\n<p>\u3064\u307e\u308a\u3001From\u30c8\u30ec\u30a4\u30c8\u3060<\/p>\n<p>x.into() \u3063\u3066\u66f8\u3051\u308b\u3068\u30ab\u30c3\u30b3\u30a4\u30a4<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">use<\/span> <span class=\"nn\">std<\/span><span class=\"p\">::<\/span><span class=\"n\">fmt<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">enum<\/span> <span class=\"n\">FizzBuzz<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">Fizz<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">Buzz<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">FizzBuzz<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"nf\">Num<\/span><span class=\"p\">(<\/span><span class=\"nb\">u32<\/span><span class=\"p\">),<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">impl<\/span> <span class=\"nn\">fmt<\/span><span class=\"p\">::<\/span><span class=\"n\">Display<\/span> <span class=\"k\">for<\/span> <span class=\"n\">FizzBuzz<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">fmt<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">,<\/span> <span class=\"n\">f<\/span><span class=\"p\">:<\/span> <span class=\"o\">&amp;<\/span><span class=\"k\">mut<\/span> <span class=\"nn\">fmt<\/span><span class=\"p\">::<\/span><span class=\"n\">Formatter<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nn\">fmt<\/span><span class=\"p\">::<\/span><span class=\"n\">Result<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">match<\/span> <span class=\"k\">self<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"o\">&amp;<\/span><span class=\"nn\">FizzBuzz<\/span><span class=\"p\">::<\/span><span class=\"n\">Fizz<\/span>     <span class=\"k\">=&gt;<\/span> <span class=\"nd\">write!<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"Fizz\"<\/span><span class=\"p\">),<\/span>\r\n            <span class=\"o\">&amp;<\/span><span class=\"nn\">FizzBuzz<\/span><span class=\"p\">::<\/span><span class=\"n\">Buzz<\/span>     <span class=\"k\">=&gt;<\/span> <span class=\"nd\">write!<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"Buzz\"<\/span><span class=\"p\">),<\/span>\r\n            <span class=\"o\">&amp;<\/span><span class=\"nn\">FizzBuzz<\/span><span class=\"p\">::<\/span><span class=\"n\">FizzBuzz<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nd\">write!<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"FizzBuzz\"<\/span><span class=\"p\">),<\/span>\r\n            <span class=\"o\">&amp;<\/span><span class=\"nn\">FizzBuzz<\/span><span class=\"p\">::<\/span><span class=\"nf\">Num<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span><span class=\"p\">)<\/span>   <span class=\"k\">=&gt;<\/span> <span class=\"nd\">write!<\/span><span class=\"p\">(<\/span><span class=\"n\">f<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">i<\/span><span class=\"p\">),<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">impl<\/span> <span class=\"n\">From<\/span><span class=\"o\">&lt;<\/span><span class=\"nb\">u32<\/span><span class=\"o\">&gt;<\/span> <span class=\"k\">for<\/span> <span class=\"n\">FizzBuzz<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">from<\/span><span class=\"p\">(<\/span><span class=\"n\">n<\/span><span class=\"p\">:<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"n\">FizzBuzz<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">match<\/span> <span class=\"p\">(<\/span><span class=\"n\">n<\/span><span class=\"o\">%<\/span><span class=\"mi\">3<\/span><span class=\"p\">,<\/span> <span class=\"n\">n<\/span><span class=\"o\">%<\/span><span class=\"mi\">5<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"mi\">0<\/span><span class=\"p\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nn\">FizzBuzz<\/span><span class=\"p\">::<\/span><span class=\"n\">FizzBuzz<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"mi\">_<\/span><span class=\"p\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nn\">FizzBuzz<\/span><span class=\"p\">::<\/span><span class=\"n\">Fizz<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"p\">(<\/span><span class=\"mi\">_<\/span><span class=\"p\">,<\/span> <span class=\"mi\">0<\/span><span class=\"p\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nn\">FizzBuzz<\/span><span class=\"p\">::<\/span><span class=\"n\">Buzz<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"mi\">_<\/span>      <span class=\"k\">=&gt;<\/span> <span class=\"nn\">FizzBuzz<\/span><span class=\"p\">::<\/span><span class=\"nf\">Num<\/span><span class=\"p\">(<\/span><span class=\"n\">n<\/span><span class=\"p\">),<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">..<\/span><span class=\"mi\">50<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"nf\">.map<\/span><span class=\"p\">(|<\/span><span class=\"n\">x<\/span><span class=\"p\">|<\/span> <span class=\"n\">x<\/span><span class=\"nf\">.into<\/span><span class=\"p\">())<\/span>\r\n        <span class=\"nf\">.for_each<\/span><span class=\"p\">(|<\/span><span class=\"n\">r<\/span><span class=\"p\">:<\/span> <span class=\"n\">FizzBuzz<\/span><span class=\"p\">|<\/span> <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">r<\/span><span class=\"p\">)<\/span> <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u3059\u3053\u3057\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u3063\u305f\u304b\u306a\uff1f<\/p>\n<h2>Into<u> for T \u3068 From for U<br \/>\n<\/u><\/h2>\n<p>\u2191\u3067\u306f From \u3092\u5b9f\u88c5\u3057\u305f\u3053\u3068\u3067 into() \u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002<br \/>\n\u3067\u3082\u3001\u3053\u3053\u3067\u7591\u554f<\/p>\n<p>Into \u3092\u5b9f\u88c5\u3059\u308b\u306e\u3068\u3001\u4f55\u304c\u9055\u3046\u3093\u3060\u308d\u3046\u304b<\/p>\n<p>From\u306b\u306f<\/p>\n<blockquote><p>From for U implies Intofor T<br \/>\nfrom is reflexive, which means that From for T is implemented<\/p><\/blockquote>\n<p>\u3068\u66f8\u304b\u308c\u3066\u3044\u308b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\">\/\/ From implies Into<\/span>\r\n<span class=\"nd\">#[stable(feature<\/span> <span class=\"nd\">=<\/span> <span class=\"s\">\"rust1\"<\/span><span class=\"nd\">,<\/span> <span class=\"nd\">since<\/span> <span class=\"nd\">=<\/span> <span class=\"s\">\"1.0.0\"<\/span><span class=\"nd\">)]<\/span>\r\n<span class=\"k\">impl<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">T<\/span><span class=\"p\">,<\/span> <span class=\"n\">U<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">Into<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">U<\/span><span class=\"o\">&gt;<\/span> <span class=\"k\">for<\/span> <span class=\"n\">T<\/span> <span class=\"k\">where<\/span> <span class=\"n\">U<\/span><span class=\"p\">:<\/span> <span class=\"n\">From<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">T<\/span><span class=\"o\">&gt;<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">into<\/span><span class=\"p\">(<\/span><span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"n\">U<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nn\">U<\/span><span class=\"p\">::<\/span><span class=\"nf\">from<\/span><span class=\"p\">(<\/span><span class=\"k\">self<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u3053\u3053\u304b\u306a\uff1f<\/p>\n<p>From for U<br \/>\n\u3068\u3044\u3046\u306e\u306f<br \/>\nT\u304b\u3089U\u3078\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b<br \/>\n\u3068\u3044\u3046\u3053\u3068\u3067<\/p>\n<p>\u305d\u308c\u306f\u3064\u307e\u308a<br \/>\nT\u306fU\u306b\u306a\u308b\u3053\u3068\u304c\u51fa\u6765\u308b<br \/>\n\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u6697\u9ed9\u7684\u306b<br \/>\nInto<u> for T<br \/>\n\u3068\u306a\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306f\u305a<\/u><\/p>\n<p>\u3063\u3066\u3044\u3046\u3053\u3068\u3067\u3059\u304b\u306d\uff1f<\/p>\n<p>\u3064\u307e\u308a\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">impl<\/span> <span class=\"n\">Into<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">Hoge<\/span><span class=\"o\">&gt;<\/span> <span class=\"k\">for<\/span> <span class=\"n\">Foo<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"err\">\u2026<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u3092\u624b\u3067\u66f8\u304f\u3053\u3068\u306f\u307b\u3068\u3093\u3069\u306a\u304f\u3066\u3001\u305d\u308c\u304c\u3084\u308a\u305f\u3044\u6642\u306fFrom\u3092\u5b9f\u88c5\u3059\u308b\u3002<\/p>\n<p>Into\u3092\u4f7f\u3046\u5834\u9762\u306f\u3001\u578b\u6307\u5b9a\u3067\u3001\u7279\u5b9a\u306e\u4f55\u304b\u306binto\u3067\u304d\u308b\u3082\u306e \u3068\u3044\u3046\u306e\u3092\u8868\u73fe\u3057\u305f\u3044\u6642\u306b\u4f7f\u3046\u3002<\/p>\n<p>\u3068\u7406\u89e3\u3057\u3066\u304a\u3051\u3070\u3044\u3044\u306e\u3060\u308d\u3046\u304b\uff1f<\/p>\n<p>\u4eca\u56de\u306e\u30b1\u30fc\u30b9\u3067\u3044\u3046\u3068<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">fn<\/span> <span class=\"n\">print_fizzbuzz<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">T<\/span><span class=\"p\">:<\/span> <span class=\"n\">Into<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">FizzBuzz<\/span><span class=\"o\">&gt;&gt;<\/span><span class=\"p\">(<\/span><span class=\"n\">x<\/span><span class=\"p\">:<\/span> <span class=\"n\">T<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"nf\">.into<\/span><span class=\"p\">())<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">..<\/span><span class=\"mi\">50<\/span><span class=\"p\">)<\/span><span class=\"nf\">.for_each<\/span><span class=\"p\">(|<\/span><span class=\"n\">x<\/span><span class=\"p\">|<\/span> <span class=\"nf\">print_fizzbuzz<\/span><span class=\"p\">(<\/span><span class=\"n\">x<\/span><span class=\"p\">)<\/span> <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u3053\u3093\u306a\u611f\u3058\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u308c\u3092\u898b\u3066\u3001\u306a\u308b\u307b\u3069\u3001\u3068\u601d\u3063\u305f\u306e\u3067\u66f8\u3044\u3066\u307f\u308b\u3053\u3068\u306b\u3057\u305f\u3002 \u30d1\u30bf\u30fc\u30f3\uff11 \u307e\u305a\u306f\u81ea\u5206\u306a\u308a\u306b\u66f8\u3044\u3066\u307f\u308b Fizz\u3068B [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44963","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) 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