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Browse - Programming Tips - How can I fix: warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning)
Date: 2010jan24 Product: VC++ Q. How can I fix: warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning) A. The Visual Studio compiler makes a big deal of int to bool conversions. For example, if you do:bool bPunct = ispunct(c); // causes warningYou'll get the warning. So how about this attempt at a fix:bool bPunct = (bool) ispunct(c); // still causes warningNo luck. The help file says its "by design" for a cast not to hide the warning. Here are a number of ways to get around the warning. Use a macro to do the conversion:#define MKBOOL(_a) ((_a) != 0) bool bPunct = MKBOOL(ispunct(c)); // No warningUse BOOL (which is an int in Windows):BOOL bPunct = ispunct(c); // No warningDisable the warning (perhaps in your stdafx.h file):#pragma warning(disable: 4800) // disables the warning
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