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class_copy_assignment.cpp
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40 lines (35 loc) · 1.12 KB
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#include <iostream>
class mystring {
public:
mystring() {
std::cout << "mystring()" << std::endl;
}
/* explicit */ mystring(const char *s)
{
std::cout << "mystring(const char *s)" << std::endl;
}
mystring(const mystring &rlh) {
std::cout << "mystring(const mystring &rlh)" << std::endl;
}
//需要明白的是：虽然下面的直接赋值的构建方式并没有调用拷贝构造函数
//（这是编译器的优化）但，依然需要此拷贝构造函数可见，定义为 delete
//将无法通过编译
//mystring(const mystring &rlh) = delete;
mystring& operator=(const mystring &rlh)
{
std::cout << "operator=(const mystring &rlh)" << std::endl;
return *this;
}
};
int main(int argc, const char *argv[])
{
std::cout << "~~~~~~~~~~~~~~~~~" << std::endl;
mystring mys = "mys";
std::cout << "~~~~~~~~~~~~~~~~~" << std::endl;
mys = "MYS";
std::cout << "~~~~~~~~~~~~~~~~~" << std::endl;
mystring mys2 = mystring("mys2");
std::cout << "~~~~~~~~~~~~~~~~~" << std::endl;
mystring mys3 = {"mys3"};
return 0;
}