c++ - C++ nesting function with pointer as return value

Question

I have a class containing a pointer

template<Foo> class Class{
    Foo * ptr;
public:
    //constructors, assignment
    Foo* view(){return ptr;}
}

and function taking Foo*as an argument

double fn(Foo*){ /*Implementation*/ }

Does the implementation

Class C;
fn(C.view());

cause the class member ptr to bee copied?

Answer 1

是的，指针是按值传递的，即它是复制的。可能两次，具体取决于优化。它指向的内容不会被复制。