{"author_url":"https://blog.hatena.ne.jp/mtv/","type":"rich","url":"https://rgba.hatenablog.com/entry/20100703/p1","version":"1.0","published":"2010-07-03 00:00:00","author_name":"mtv","width":"100%","height":"190","provider_name":"Hatena Blog","blog_url":"https://rgba.hatenablog.com/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Frgba.hatenablog.com%2Fentry%2F20100703%2Fp1\" title=\" C++ \u3067\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u305f\u4eee\u60f3\u95a2\u6570\u3092\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u547c\u3076 - \" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_title":"","image_url":null,"title":" C++ \u3067\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u305f\u4eee\u60f3\u95a2\u6570\u3092\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u547c\u3076","provider_url":"https://hatena.blog","categories":["\u5b9f\u9a13\u3057\u3066\u307f\u305f"],"description":"ClassA \u306e\u4eee\u60f3\u95a2\u6570 method() \u3092\u7d99\u627f\u3057\u305f ClassB \u3067\u30aa\u30fc\u30d0\u30e9\u30a4\u30c9\u3057\u305f\u5834\u5408\u3067\u3082 ClassA \u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u306e method() \u306f ClassA::method() \u3092\u6307\u3057\u3066\u3044\u308b\u3002\u3053\u308c\u306f vptr \u306e\u521d\u671f\u5316\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u8aac\u660e\u3067\u304d\u308b\u3068\u601d\u3063\u3066\u3044\u305f\u304c\u9055\u3063\u305f orz\uff08\u4ee5\u4e0b\u3001ubuntu 64bit \u74b0\u5883\u3067\u8a66\u3057\u3066\u3044\u308b\u306e\u3067 vtbl \u306a\u3069\u306e\u30dd\u30a4\u30f3\u30bf\u306f 8 \u30d0\u30a4\u30c8\u3002\u5ff5\u306e\u305f\u3081 -O0 \u3067\u30d3\u30eb\u30c9\u3057\u3066\u3044\u308b\uff09 class ClassA { public: ClassA() { method(); } virtual void method() { printf(\"ClassA::method(\u2026"}