{"published":"2018-11-13 00:00:00","title":"\u30af\u30e9\u30b9\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u975e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30f3\u30d0\u95a2\u6570\u3067SFINAE","provider_url":"https://hatena.blog","blog_title":"yohhoy\u306e\u65e5\u8a18","categories":["C++","C++2a"],"url":"https://yohhoy.hatenadiary.jp/entry/20181113/p1","author_name":"yohhoy","provider_name":"Hatena Blog","image_url":null,"author_url":"https://blog.hatena.ne.jp/yohhoy/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyohhoy.hatenadiary.jp%2Fentry%2F20181113%2Fp1\" title=\"\u30af\u30e9\u30b9\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u975e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30f3\u30d0\u95a2\u6570\u3067SFINAE - yohhoy\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://yohhoy.hatenadiary.jp/","height":"190","description":"\u30af\u30e9\u30b9\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u57fa\u3065\u304d\u3001\u975e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306a\u30e1\u30f3\u30d0\u95a2\u6570\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3067SFINAE\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\u3002 template<typename T, typename U> struct X { // \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30d1\u30e9\u30e1\u30fc\u30bfT, U\u306b\u3088\u308b\u30e1\u30f3\u30d0\u95a2\u6570\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9 void mf(const T&) { ... } // A) void mf(const U&) { ... } // B) }; // NG: \u30e1\u30f3\u30d0\u95a2\u6570A), B)\u304c\u540c\u4e00\u30b7\u30b0\u30cd\u30c1\u30e3\u3068\u306a\u308b X<int, int> x; SFINAE\u306f\u95a2\u6570\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u63a8\u8ad6\u6642\u306b\u306e\u307f\u6a5f\u80fd\u3059\u308b\u3002\u4e0b\u8a18\u30b3\u30fc\u30c9B)\u306f\u975e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30f3\u2026","type":"rich","width":"100%","version":"1.0"}