{"height":"190","published":"2021-07-07 22:27:45","categories":["C++","C++11\u4ee5\u4e0a","C+/CLI"],"provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/Takachan/","author_name":"Takachan","description":"const \u53c2\u7167\u3068 shared_ptr \u306e\u30c0\u30a6\u30f3\u30ad\u30e3\u30b9\u30c8\u65b9\u6cd5\u3067\u3059\u3002 \u5148\u306b\u65b9\u6cd5\u3092\u66f8\u3044\u3066\u304a\u304d\u307e\u3059\u304c\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002 // const\u53c2\u7167\u306e\u30c0\u30a6\u30f3\u30ad\u30e3\u30b9\u30c8 auto&/*const Type&*/ sub = static_cast<const Type&>(obj); // shared_ptr\u306e\u30c0\u30a6\u30f3\u30ad\u30e3\u30b9\u30c8 std::shared_ptr<Type> sub = std::dynamic_pointer_cast<Type>(ptr); \u8aac\u660e \u4ee5\u4e0b\u306e\u3088\u3046\u306b Base \u3092\u7d99\u627f\u3057\u305f Derived \u30af\u30e9\u30b9\u5b9a\u7fa9\u304c\u3042\u3063\u305f\u3068\u3057\u307e\u3059\u3002 class Base { public: int a = 0; vi\u2026","version":"1.0","blog_url":"https://takap-tech.com/","image_url":null,"type":"rich","blog_title":"PG\u65e5\u8a8c","provider_url":"https://hatena.blog","width":"100%","url":"https://takap-tech.com/entry/2021/07/07/222745","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftakap-tech.com%2Fentry%2F2021%2F07%2F07%2F222745\" title=\"\u3010C++\u3011const\u53c2\u7167\u3068shared_ptr\u3092\u30c0\u30a6\u30f3\u30ad\u30e3\u30b9\u30c8\u3059\u308b - PG\u65e5\u8a8c\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"\u3010C++\u3011const\u53c2\u7167\u3068shared_ptr\u3092\u30c0\u30a6\u30f3\u30ad\u30e3\u30b9\u30c8\u3059\u308b"}