Why Does C Compiler Error C2280 \'attempting to reference a deleted function\' Occur in Visual Studio 2015 but Not 2013?

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

In Visual Studio 2013, the following code snippet compiles without errors:

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

int main(int, char*)
{
   A a;
   new A(a);
   return 0;
}

However, the same code snippet generates an error in Visual Studio 2015:

1>------ Build started: Project: foo, Configuration: Debug Win32 ------
1>  foo.cpp
1>c:\dev\foo\foo.cpp(11): error C2280: 'A::A(const A &)': attempting to reference a deleted function
1>  c:\dev\foo\foo.cpp(6): note: compiler has generated 'A::A' here
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

This is because the C standard specifies that if a class declares a move constructor or move assignment operator, the implicitly declared copy constructor is defined as deleted.

To fix this problem, you can explicitly provide a copy constructor and copy assignment operator:

class A
{
public:
   A(){}
   A(A &&){}
   A(const A&) = default;
   A& operator=(const A&) = default;
};

This will allow you to copy-construct and copy-assign objects of class A.

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