{"description":"class B; class A{ public: B b; // \u2190error: field \u2018b\u2019 has incomplete type B *pb; }; class B{ public: A a; A *pa; };","provider_url":"https://hatena.blog","author_name":"iww","blog_title":"\u63ee\u767a\u6027\u306e\u30e1\u30e2\uff12","author_url":"https://blog.hatena.ne.jp/iww/","published":"2012-07-26 00:00:00","height":"190","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fiww.hateblo.jp%2Fentry%2F20120726%2Fsogo\" title=\"\u76f8\u4e92\u53c2\u7167\u306f\u5b9f\u4f53\u30c0\u30e1 - \u63ee\u767a\u6027\u306e\u30e1\u30e2\uff12\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://iww.hateblo.jp/","width":"100%","provider_name":"Hatena Blog","image_url":null,"categories":["C++"],"type":"rich","url":"https://iww.hateblo.jp/entry/20120726/sogo","version":"1.0","title":"\u76f8\u4e92\u53c2\u7167\u306f\u5b9f\u4f53\u30c0\u30e1"}