C++ Compiler Error C2280 “attempting to reference a deleted function” in Visual Studio 2013 and 2015

Question

This snippet is compiled without errors in Visual Studio 2013 (Version 12.0.31101.00 Update 4)

class A
{
public:
   A(){}
   A(A &&){}
};

int main(i         


        

Answer 1

I ran into a similar situation where I had a hierarchy of classes and a destructor in the base class was declared virtual. In this case, compiler does NOT automatically generate move and copy constructors. So we have to default these in order for compiler to generate the definitions for these methods.

However, I ran into another issue after I defaulted copy and move constructor. I saw that the compiler was still not able to generate copy and move constructors. The reason was the usage of std::atomic member variable in the base class. Since atomic variable are not copy able or movable, the compiler could not generate definitions for copy constructor. This gave me lot of headache and I had to solve the problem using a different method. See other great answers for similar issue that I faced.

References: Does a default virtual destructor prevent compiler-generated move operations?

Error with copy constructor/assignment operator for a class which has std::atomic member variable