Compiler Warning (level 1) C4549

 

For the latest documentation on Visual Studio 2017, see Visual Studio 2017 Documentation.

For the latest documentation on Visual Studio 2017, see Compiler Warning (level 1) C4549 on docs.microsoft.com. 'operator' : operator before comma has no effect; did you intend 'operator'?

The compiler detected an ill-formed comma expression.

This warning is off by default. For more information, see Compiler Warnings That Are Off by Default.

The following sample generates C4549:

// C4549.cpp  
// compile with: /W1  
#pragma warning (default : 4549)  
  
int main() {  
   int i = 0, k = 0;  
  
   if ( i == 0, k )   // C4549  
   // try the following line instead  
   // if ( i == 0 )  
      i++;  
}  

Show: