{"provider_url":"https://hatena.blog","categories":["C++"],"title":"virtual constructor...?","author_name":"E_Mattsan","provider_name":"Hatena Blog","image_url":"https://images-fe.ssl-images-amazon.com/images/I/51G%2BdnezRWL._SL160_.jpg","version":"1.0","url":"https://blog.emattsan.org/entry/20100208/1265640034","published":"2010-02-08 23:40:34","blog_url":"https://blog.emattsan.org/","author_url":"https://blog.hatena.ne.jp/E_Mattsan/","width":"100%","description":"\u3044\u307e\u3001C++ \u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u7b4b\u3068\u5b9a\u77f3\u3092\u8aad\u3093\u3067\u3044\u308b\u9014\u4e2d\u306a\u3093\u3067\u3059\u304c\u3001\u672a\u7d4c\u9a13\u306e\u5b9f\u88c5\u304c\u51fa\u3066\u304d\u3066\u6238\u60d1\u3063\u3066\u3044\u308b\u3068\u3053\u308d\u3002 \u57fa\u5e95\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4e2d\u3067\u3001placement new\u3092\u4f7f\u3063\u3066\u81ea\u5206\u306e\u9818\u57df(this)\u3092\u81ea\u5206\u306e\u6d3e\u751f\u30af\u30e9\u30b9\u3067construct\u3057\u3066\u3057\u307e\u3046\u3068\u3044\u3046\u3082\u306e\u3002\u3053\u308c\u3067\u3001\u4e00\u7a2e\u306e\u4eee\u60f3\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5b9f\u73fe\u3057\u3066\u307e\u3059\u3002new(this) Derived\u3068\u3044\u3046\u30b3\u30fc\u30c9\u306e\u8cdb\u5426\u306b\u3064\u3044\u3066\u306f\u4fdd\u7559\u3057\u305f\u3068\u3057\u3066\u3001\u305d\u308c\u4ee5\u5916\u3067\u554f\u984c\u306b\u306a\u308b\u306e\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b5\u30a4\u30ba\u3067\u3059\u3002\u3053\u306e\u4ed5\u7d44\u3092\u5b9f\u73fe\u3057\u3066\u3044\u308b\u306e\u306f\u57fa\u5e95\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4e2d\u306a\u306e\u3067\u3001this\u304c\u6307\u3057\u793a\u3059\u9818\u57df\u306e\u30b5\u30a4\u30ba\u304c\u6d3e\u751f\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u53ce\u307e\u308b\u30b5\u30a4\u30ba\u306a\u306e\u304b\u308f\u304b\u308a\u307e\u305b\u3093\u3002\u3068\u3044\u3046\u304b\u3001\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog.emattsan.org%2Fentry%2F20100208%2F1265640034\" title=\"virtual constructor...? - \u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u7684\u611b\u60c5\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","type":"rich","height":"190","blog_title":"\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u7684\u611b\u60c5"}