nonstd.h

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#ifndef nonstd_h
#define nonstd_h
 
namespace nonstd {
template <class T> constexpr T abs(T x) noexcept {return x < 0 ? - x : x;}
 
constexpr int isdigit(int ch) noexcept {
  return ch == '0' or ch == '1' or ch == '2' or ch == '3' or
         ch == '4' or ch == '5' or ch == '6' or ch == '7' or
         ch == '8' or ch == '9';
}
 
constexpr int isspace(int ch) noexcept {
  return ch == ' ' or ch == '\n' or ch == '\r' or ch == '\t' or ch == '\f' or
         ch == '\v';
}
 
constexpr bool isnan(double d) noexcept {return d not_eq d;}
constexpr bool isnan(long double d) noexcept {return d not_eq d;}
constexpr bool isnan(float d) noexcept {return d not_eq d;}
} // namespace nonstd
 
#endif