C是否将构造和复制优化为复制构造函数?
发布时间:2020-12-16 10:29:55 所属栏目:百科 来源:网络整理
导读:C编译器是否自动转换: MyObject object2 = object1; 成 MyObject object2( object1 ); ? 或者它是否像对待它一样: MyObject object2;object2 = object1; ? 解决方法 您可以尝试这样来查看确切的行为: #include iostreamclass MyObject {public: MyObjec
C编译器是否自动转换:
MyObject object2 = object1; 成 MyObject object2( object1 ); ? 或者它是否像对待它一样: MyObject object2; object2 = object1; ? 解决方法
您可以尝试这样来查看确切的行为:
#include <iostream> class MyObject { public: MyObject() { std::cout << "MyObject()" << std::endl; } MyObject(const MyObject& other) { std::cout << "MyObject(const MyObject& other)" << std::endl; } MyObject& operator=(const MyObject& other) { std::cout << "operator=(const MyObject& other)" << std::endl; return *this; } }; int main() { MyObject object1; MyObject object2 = object1; MyObject object3(object1); MyObject object4; object4 = object1; } 输出: MyObject() MyObject(const MyObject& other) MyObject(const MyObject& other) MyObject() operator=(const MyObject& other) 除此之外,我建议阅读What is The Rule of Three? (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |