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 encountered the same error, just because I had misused std::unique_ptr.

Note that std::unique_ptr is non-copyable, it is only moveable.

Here is the wrong demonstration.

class word;
class sentence
{
    public:
        sentence();
        ~sentence();

    public:
        // Wrong demonstration, because I pass the parameter by value/copying
        // I should use 'std::shared_ptr< word >' instead.
        sentence(std::initializer_list< std::unique_ptr< word > > sentence);
};

The following code is taken from MSVC compiler's STL library. We can see that the copy constructor and copy assignment operator of class unique_ptr are deleted explicitly.

    unique_ptr(const unique_ptr&) = delete;
    unique_ptr& operator=(const unique_ptr&) = delete;