Method isfinite

include/fmt/format.h:2652–2657

template <typename T,
          FMT_ENABLE_IF(is_floating_point<T>::value&& has_isfinite<T>::value)>
FMT_CONSTEXPR20 auto isfinite(T value) -> bool {
  constexpr T inf = T(std::numeric_limits<double>::infinity());
  if (is_constant_evaluated())
    return !detail::isnan(value) && value < inf && value > -inf;
  return std::isfinite(value);
}
template <typename T, FMT_ENABLE_IF(!has_isfinite<T>::value)>
FMT_CONSTEXPR auto isfinite(T value) -> bool {
  T inf = T(std::numeric_limits<double>::infinity());