{"title":" C++\u306eif\u6761\u4ef6\u5f0f\u306e\u4e2d\u3067\u306e\u5909\u6570\u5ba3\u8a00","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbettamodoki.hatenadiary.jp%2Fentry%2F20170605%2F1496632904\" title=\" C++\u306eif\u6761\u4ef6\u5f0f\u306e\u4e2d\u3067\u306e\u5909\u6570\u5ba3\u8a00 - bettamodoki\u306e\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","width":"100%","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/bettamodoki/","image_url":null,"blog_url":"https://bettamodoki.hatenadiary.jp/","height":"190","description":"dynamic_cast\u3092\u5229\u7528\u3059\u308b\u969b\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304f\u5834\u9762\u304c\u51fa\u3066\u304f\u308b. Base* base = new DerivA(); if (DerivA* derivA = dynamic_cast<DerivA*>(base)) { ; // do something with derivA } if (DerivB* derivB = dynamic_cast<DerivB*>(base)) { ; // do something with derivB } \u3053\u306e\u5834\u5408, \u4e8c\u5ea6\u76ee\u306edynamic_cast\u306f\u5931\u6557\u3059\u308b\u305f\u3081, if\u6587\u306e\u4e2d\u8eab\u3082\u5b9f\u884c\u3055\u308c\u306a\u3044.\u3057\u304b\u3057, \u5b9f\u969b\u306e\u3068\u3053\u308d\u3053\u308c\u306f\u3053\u306e\u5ba3\u8a00\u5f0f\u306e\u4f55\u3092\u5224\u65ad\u2026","published":"2017-06-05 12:21:44","blog_title":"bettamodoki\u306e\u30d6\u30ed\u30b0","url":"https://bettamodoki.hatenadiary.jp/entry/20170605/1496632904","provider_url":"https://hatena.blog","type":"rich","categories":[],"author_name":"bettamodoki","version":"1.0"}