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Compiler Error C2662

Error Message

'function' : cannot convert 'this' pointer from 'type1' to 'type2'

The compiler could not convert the this pointer from type1 to type2.

This error can be caused by invoking a non-const member function on a const object. Possible resolutions:

  • Remove the const from the object declaration.

  • Add const to the member function.

The following sample generates C2662:

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

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

When compiling with /clr, you cannot call a function on a const or volatile qualified managed type. You cannot declare a const member function of a managed class, so you cannot call methods on const managed objects.

// C2662_b.cpp
// compile with: /c /clr
ref struct M {
   property M^ Type {
      M^ get() { return this; }
   }

   void operator=(const M %m) {
      M ^ prop = m.Type;   // C2662
   }
};

ref struct N {
   property N^ Type {
      N^ get() { return this; }
   }

   void operator=(N % n) {
      N ^ prop = n.Type;   // OK
   }
};

The following sample generates C2662:

// C2662_c.cpp
// compile with: /c
// C2662 expected
typedef int ISXVD;
typedef unsigned char BYTE;

class LXBASE {
protected:
    BYTE *m_rgb;
};

class LXISXVD:LXBASE {
public:
   // Delete the following line to resolve.
   ISXVD *PMin() { return (ISXVD *)m_rgb; }

   ISXVD *PMin2() const { return (ISXVD *)m_rgb; };   // OK
};

void F(const LXISXVD *plxisxvd, int iDim) {
   ISXVD isxvd;
   // Delete the following line to resolve.
   isxvd = plxisxvd->PMin()[iDim];

   isxvd = plxisxvd->PMin2()[iDim];  
}

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