I was forced to lookup Visual Studio’s Compiler Error C2662 because I was getting it in my code. Turns out this happens when your const’s don’t line up. In my case I had const in the client declaration but the member function I was calling didn’t have the const specification.

This little nugget of code from the referenced article shows how to fix up the problem:

// C2662.cpp
class C {
public:
   void func1();
   void func2() const{}
} const c;

int main() {
   c.func1();   // C2662
   c.func2();   // OK
}