Copy Constructor

约 33 个字 14 行代码

Only necessary to be written manually when there exists member of pointer type.

When Copy Ctors are called

• Initialize from other object

  A a(b);
  A a = b; // equivalent to A a(b)
  

• Function call by value

  void f(A a);
  

• Function return

  A f(){
    A a;
    return a;
  }
  
  A f2(){
    return A();
  }
  A b = f(); // Copy Ctor is called
  A c = f2(); // Copy Ctor not called
  

Forbid Copy Ctor

A(const A& other) = delete;