{"provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fousttrue.hatenadiary.org%2Fentry%2F20081225%2F1230209634\" title=\"traits\u3068tag dispatch\u304c\u308f\u304b\u3063\u305f - \u4e09\u6b21\u5143\u65e5\u8a8c\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","categories":["c++"],"title":"traits\u3068tag dispatch\u304c\u308f\u304b\u3063\u305f","height":"190","blog_title":"\u4e09\u6b21\u5143\u65e5\u8a8c","url":"https://ousttrue.hatenadiary.org/entry/20081225/1230209634","author_url":"https://blog.hatena.ne.jp/ousttrue/","provider_url":"https://hatena.blog","published":"2008-12-25 21:53:54","width":"100%","image_url":null,"blog_url":"https://ousttrue.hatenadiary.org/","type":"rich","author_name":"ousttrue","version":"1.0","description":"\u3084\u3063\u3068\u308f\u304b\u3063\u305f\u3002 \u3053\u308c\u306f\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3046\u3060\u3051\u3067\u306a\u304f\u3066\u66f8\u3044\u3066\u307f\u306a\u3044\u3068\u306a\u304b\u306a\u304b\u308f\u304b\u3089\u306a\u3044\u306a\u3002 \u4ee5\u4e0b p[0]\u3068p.x\u3068\u3044\u3046\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u9055\u3046\u3082\u306e\u3092\u4e00\u7dd2\u304f\u305f\u306b\u6271\u3046\u305f\u3081\u306e\u52aa\u529b\u3002 #include <iostream> namespace di { // \u95a2\u6570\u5206\u5c90\u7528\u306e\u30bf\u30b0 struct unknown_tag {}; struct use_access_operator_tag {}; // \u4f55\u3082\u3057\u306a\u3044\u975e\u7279\u6b8a\u5316\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8 template<typename T> struct elements_traits { typedef unknown_tag tag; typedef void value\u2026"}