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

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

From [class.copy]/7, emphasis mine:

If the class definition does not explicitly declare a copy constructor, a non-explicit one is declared implicitly.
If the class definition declares a move constructor or move assignment operator, the implicitly declared copy
constructor is defined as deleted; otherwise, it is defined as defaulted (8.4). The latter case is deprecated if
the class has a user-declared copy assignment operator or a user-declared destructor.

There is an equivalent section with similar wording for copy assignment in paragraph 18. So your class is really:

class A
{
public:
   // explicit
   A(){}
   A(A &&){}

   // implicit
   A(const A&) = delete;
   A& operator=(const A&) = delete;
};

which is why you cant copy-construct it. If you provide a move constructor/assignment, and you still want the class to be copyable, you will have to explicitly provide those special member functions:

    A(const A&) = default;
    A& operator=(const A&) = default;

You will also need to declare a move assignment operator. If you really have a need for these special functions, you will also probably need the destructor. See Rule of Five.

I had the same problem and it was due to a poorly defined member variable:

double const deltaBase = .001;

Putting this in will cause the copy constructor to be deleted. Get rid of the const and assign in the constructor.

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

I was stuck with this error even after defaulting the copy ctor. Turned out, one of my class member (rapidjsons Document object) was disallowing copy. Changed it to a reference, initialized via a *(new rapidjson::Document()) in the default ctors initializer list. Looks like all individual members should also be copyable in addition to the defaulted copy ctor.

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