iww https://blog.hatena.ne.jp/iww/ 揮発性のメモ２ https://iww.hateblo.jp/ C++ #include <string> #include <iostream> using namespace std; class Hoge { public: virtual string to_str(){ return "hoge"; } }; class Piyo : public Hoge { public: virtual string to_str(){ return "piyo"; } }; Hoge *getp() { return new Piyo(); } Hoge get() { Piyo a; return a; } int main() { Hoge *p = get… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fiww.hateblo.jp%2Fentry%2F20120703%2Fcpp" title="実体をまるごと返すとキャストされる - 揮発性のメモ２" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2012-07-03 00:00:00 rich https://iww.hateblo.jp/entry/20120703/cpp 1.0 100%