Compiler Warning (level 1) C4804
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Compiler Warning (level 1) C4804

Error Message

'operation' : unsafe use of type 'bool' in operation

This warning is for when you used a bool variable or value in an unexpected way. For example, C4804 is generated if you use operators such as the negative unary operator (-) or the complement operator (~). The compiler evaluates the expression.


The following sample generates C4804:

// C4804.cpp
// compile with: /W1

int main()
   bool i = true;
   if (-i)   // C4804, remove the '-' to resolve
      i = false;
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