Hi i am trying to understand how direct and copy initialization works and so have this example whose output i am unable to understand.
class DeletedCopy
{ public:
DeletedCopy(const DeletedCopy&) = delete;
DeletedCopy(DeletedCopy&) = delete;
DeletedCopy()
{
std::cout<<"DeletedCopy Default constructor "<<std::endl;
}
DeletedCopy(DeletedCopy &&)
{
std::cout<<"DeletedCopy move constructor"<<std::endl;
}
};
class NAME
{
private:
std::string name;
DeletedCopy temp;
public:
NAME() = default;
NAME(const NAME& _name): name(_name.name)
{
std::cout<<"Copy constructor ran"<<std::endl;
}
NAME(DeletedCopy d): name("v"),temp(std::move(d))
{
std::cout<<"explicit constructor NAME"<<std::endl;
}
};
int main()
{
cout << "Hello World" << endl;
NAME name3 = DeletedCopy();//this works and prints 3 lines on screen.
NAME name4(DeletedCopy());//this doesn't print anything on console. Why doesn't this print anything. Is this statement UB
return 0;
}
In this example when i used direct initialization, nothing is printed on the console. While if i use copy initialization then i get 3 lines printed on the console. Why isn't the direct initialization case working.
