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
