{"url":"https://flat-leon.hatenablog.com/entry/cpp_pointer_if_decl","blog_url":"https://flat-leon.hatenablog.com/","blog_title":"Flat Leon Works","author_name":"shinya_game_app","height":"190","author_url":"https://blog.hatena.ne.jp/shinya_game_app/","image_url":null,"title":"\u3010C++ \u5c0f\u30cd\u30bf\u3011\u30dd\u30a4\u30f3\u30bf\u5909\u6570\u306e\u521d\u671f\u5316\u306fif\u6587\u306e\u6761\u4ef6\u5f0f\u3067\u884c\u3046\u3068\u4e00\u77f3\u4e09\u9ce5","provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fflat-leon.hatenablog.com%2Fentry%2Fcpp_pointer_if_decl\" title=\"\u3010C++ \u5c0f\u30cd\u30bf\u3011\u30dd\u30a4\u30f3\u30bf\u5909\u6570\u306e\u521d\u671f\u5316\u306fif\u6587\u306e\u6761\u4ef6\u5f0f\u3067\u884c\u3046\u3068\u4e00\u77f3\u4e09\u9ce5 - Flat Leon Works\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","description":"\u95a2\u6570\u306e\u623b\u308a\u5024\u3084dynamic_cast\u7d50\u679c\u306e\u30dd\u30a4\u30f3\u30bf\u306fNULL\u306e\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3057\u3066NULL\u30dd\u30a4\u30f3\u30bf\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30af\u30e9\u30c3\u30b7\u30e5\u3055\u305b\u305f\u308a\u3057\u307e\u3059\u3002 Hoge* p_hoge = GetHoge(); p_hoge->SetValue( 4 ); // p_hoge\u304cNULL\u3060\u3068\u30a2\u30a6\u30c8 \u5f53\u7136\u3001if\u6587\u3067NULL\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3048\u3070NULL\u30dd\u30a4\u30f3\u30bf\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002 Hoge* p_hoge = GetHoge(); if ( p_hoge ) { p_hoge->SetValue( 4 ); // p_hoge\u306fNULL\u30c1\u30a7\u30c3\u30af\u6e08\u307f } \u3057\u304b\u3057\u3082\u3063\u3068\u826f\u3044\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002 if ( \u2026","provider_url":"https://hatena.blog","published":"2016-03-05 11:08:03","version":"1.0","categories":["C++","\u6280\u8853"],"type":"rich","width":"100%"}