I have a class A with a member variable _atomicVar of type std::atomic<int>.

#include <atomic>

class A
{
public:
    A();
    ~A();

private:
    std::atomic<int> _atomicVar;
};

If I build the project I get the following error:

error C2280: 'std::atomic<int>::atomic(const std::atomic<int> &)' : attempting to reference a deleted function

I'm mainly a C# developer so I don't know every detail of C++ (yet). I don't know where I use the copy c'tor of atomic<int>.

I also tried to initialize _atomicVar:

std::atomic<int> _atomicVar { 0 };

... but that didn't work.

I would expect that _atomicVar (without an explicit initialization) would get initialized with the default value for int.

Can you tell me why this error occurs?