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Compiler Error C2171

  • Article

'operator' : illegal on operands of type 'type'

A unary operator is used with an invalid operand type.

Examples

The following sample generates C2171.

// C2171.cpp
int main() {
   double d, d1;
   d = ~d1;   // C2171

   // OK
   int d2 = 0, d3 = 0;
   d2 = ~d3;
}

The following sample generates C2171.

// C2171_b.cpp
// compile with: /c
class A {
public:
   A() { STF( &A::D ); }

   void D() {}
   void DTF() {
      (*TF)();   // C2171
      (this->*TF)();   // OK
   }

   void STF(void (A::*fnc)()) {
      TF = fnc;
   }

private:
   void (A::*TF)();
};