Warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning)

Question

I have this problem in my code:

bool CBase::isNumber()
{
return (id & MID_NUMBER);
}

bool CBase::isVar()
{
return (id & MID_VARIABLE);
}

bool CBase::isSymbol()
{
return (id & MID_SYMBOL);
}

Answer 1

FYI: Casts won't hide the warning by design.

Something like

return (id & MID_NUMBER) != 0;

should clearly state "I want to check whether this value is zero or not" and let the compiler be happy