{"provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyohhoy.hatenadiary.jp%2Fentry%2F20121110%2Fp1\" title=\"bool\u578b\u3078\u306eexplicit\u30e6\u30fc\u30b6\u5b9a\u7fa9\u5909\u63db - 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>","url":"https://yohhoy.hatenadiary.jp/entry/20121110/p1","description":"C++11\u304b\u3089\u306f\u30e6\u30fc\u30b6\u5b9a\u7fa9\u5909\u63db\u306b\u5bfe\u3057\u3066explicit\u6307\u5b9a\u304c\u3067\u304d\u3001\u610f\u56f3\u3057\u306a\u3044\u6697\u9ed9\u306e\u578b\u5909\u63db\u3092\u6291\u6b62\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002\u4e00\u65b9\u3067\u300cbool\u578b\u3078\u306eexplicit\u30e6\u30fc\u30b6\u5b9a\u7fa9\u5909\u63db\u300d\u3060\u3051\u306f\u3001\u8a18\u8ff0\u3055\u308c\u3066\u3044\u308b\u5834\u6240\u306b\u5fdc\u3058\u3066\uff08\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u4f9d\u5b58\u3057\u3066\uff09\u81ea\u52d5\u7684\u306bbool\u578b\u3078\u3068\u5909\u63db\u3055\u308c\u308b\u3002 class T { //... explicit operator bool() const; // \u578bT\u2192bool\u3078\u306e\u5909\u63db }; void func(bool); T t; func(t); // NG: \u6697\u9ed9\u7684\u306bT\u2192bool\u3078\u5909\u63db\u3055\u308c\u306a\u3044 func(bool(t)); // OK: \u660e\u793a\u7684\u306a\u578b\u5909\u63db\u306f\u8a31\u5bb9 if (t) { ... \u2026","type":"rich","height":"190","width":"100%","blog_url":"https://yohhoy.hatenadiary.jp/","published":"2012-11-10 00:00:00","title":"bool\u578b\u3078\u306eexplicit\u30e6\u30fc\u30b6\u5b9a\u7fa9\u5909\u63db","version":"1.0","provider_name":"Hatena Blog","author_name":"yohhoy","author_url":"https://blog.hatena.ne.jp/yohhoy/","blog_title":"yohhoy\u306e\u65e5\u8a18","image_url":null,"categories":["C++"]}