{"categories":["Scala","Haskell"],"provider_name":"Hatena Blog","width":"100%","author_url":"https://blog.hatena.ne.jp/pocketberserker/","description":"Gitter\u3067\u8cea\u554f\u3057\u305f\u306e\u3067\u305d\u306e\u30e1\u30e2*1\u3002 \u306a\u304a\u79c1\u306e\u82f1\u8a9e\u306f\u58ca\u6ec5\u7684\u306a\u306e\u3067\u7247\u8a00\uff1f\u306a\u306e\u306f\u8a31\u3057\u3066\u304f\u3060\u3055\u3044\u3002 Hello. Why does Generic[Boolean] instance not exist? \u3068\u6295\u7a3f\u3057\u305f\u3068\u3053\u308d\u3001milessabin\u3055\u3093(shapeless\u4f5c\u8005)\u304b\u3089 Because there's no obvious sum of product representation of Boolean. I guess you would want false.type :+: true.type :+: CNil? \u3068\u8fd4\u7b54\u304c\u3042\u3063\u305f\u3002\u306a\u308b\u307b\u3069\u3002 @milessabin Thank yo\u2026","published":"2015-07-29 20:11:10","title":"\"\u306a\u305cshapeless\u306b\u306fGeneric[Boolean]\u304c\u306a\u3044\u306e\uff1f\"\u3068\u5c0b\u306d\u3066\u307f\u305f","provider_url":"https://hatena.blog","type":"rich","blog_title":"pocketberserker\u306e\u7206\u8d70","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fpocketberserker.hatenablog.com%2Fentry%2F2015%2F07%2F29%2F201110\" title=\"&quot;\u306a\u305cshapeless\u306b\u306fGeneric[Boolean]\u304c\u306a\u3044\u306e\uff1f&quot;\u3068\u5c0b\u306d\u3066\u307f\u305f - pocketberserker\u306e\u7206\u8d70\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"author_name":"pocketberserker","version":"1.0","blog_url":"https://pocketberserker.hatenablog.com/","height":"190","url":"https://pocketberserker.hatenablog.com/entry/2015/07/29/201110"}