compiler-warning-level-1-c4620.md

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Learn more about: Compiler Warning (level 1) C4620	Compiler Warning (level 1) C4620	11/04/2016	C4620	C4620	fed29934-b797-47e8-bbea-c7e5f8dd6e93

Compiler Warning (level 1) C4620

no postfix form of 'operator ++' found for type 'type', using prefix form

There is no postfix increment operator defined for the given type. The compiler used the overloaded prefix operator.

This warning can be avoided by defining a postfix ++ operator. Create a two-argument version of the ++ operator as shown here:

// C4620.cpp
// compile with: /W1
class A
{
public:
   A(int nData) : m_nData(nData)
   {
   }

   A operator++()
   {
      m_nData -= 1;
      return *this;
   }

   // A operator++(int)
   // {
   //    A tmp = *this;
   //    m_nData -= 1;
   //    return tmp;
   // }

private:
   int m_nData;
};

int main()
{
   A a(10);
   ++a;
   a++;   // C4620
}