普通指針與share_ptr的互相轉換:
struct test { int num; string name; }; test* pTest = new test(); std::shared_ptr<test> ptr_test = std::shared_ptr<test>(pTest); //普通指針轉shared_ptr std::shared_ptr<test> ptr_test2 = std::make_shared<test>(); test* pTest2 = ptr_test2.get(); //shared_ptr轉普通指針