isnan returns an int… nonzero value if arg is NaN, 0 otherwise. Why doesn’t it return a bool? This isn’t some legacy stuff, it’s new with C++11.
isnan returns an int… nonzero value if arg is NaN, 0 otherwise . Why
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isnan returns an int… nonzero value if arg is NaN, 0 otherwise. Why doesn’t it return a bool? This isn’t some legacy stuff, it’s new with C++11.
It is legacy stuff, these are found in
<cmath>, which is the C standard library<math.h>put into thestdnamespace. C doesn’t have a nativebooltype.1Whilst it’s true that these are a C++11 addition, they are essentially pulling in stuff that was added to
<math.h>in C99.1. For those about to complain, C99’s
boolis actually a macro. There is a_Bool, but I guess the C99 authors chose not to use it forisnanet al. in order to retain consistency with other stuff in<math.h>.