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Compiler Error C2804

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binary 'operator operator' has too many parameters

The overloaded binary operator member function is declared with more than one parameter. The first operand parameter of a binary operator member function, whose type is the operator's enclosing type, is implied.

Examples

The following sample generates C2804 and shows how to fix it.

// C2804.cpp
// compile by using: cl /c /W4 C2804.cpp
class X {
public:
   X& operator+= (const X &left, const X &right);   // C2804
   X& operator+= (const X &right);   // OK - left operand implicitly *this
};

int main() {
   X x, y;
   x += y;   // equivalent to x.operator+=(y)
}

The following sample generates C2804 and shows how to fix it.

// C2804_2.cpp
// compile with: /clr /c
ref struct Y {
   Y^ operator +(Y^ hY, int i);   // C2804
   static Y^ operator +(Y^ hY, int i);   // OK
   Y^ operator +(int i);   // OK
};