C++变量声明和初始化规则

这意味着:

C c1;   // default constructor

C c2;   // default constructor
c2 = C(); // default constructor followed by assignment

C c3(C());   // default constructor possibly followed by copy constructor

C c4 = C();  // default constructor possibly followed by copy constructor

注意编译器可以省略复制构造函数调用。它们相等吗?-好吧,这取决于复制构造函数和赋值运算符的作用。