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Implement constexpr isfinite to avoid producing NaN

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This commit is contained in:
Victor Zverovich
2022-05-11 07:21:09 -07:00
parent 358f5a7e50
commit ae963e444f
2 changed files with 9 additions and 3 deletions
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10
include/fmt/format.h
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@@ -2343,12 +2343,16 @@ struct has_isfinite<T, enable_if_t<sizeof(std::isfinite(T())) != 0>>
template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value&&
has_isfinite<T>::value)>
FMT_CONSTEXPR20 bool isfinite(T value) {
if (is_constant_evaluated()) return !isnan(value - value);
constexpr T inf = T(std::numeric_limits<double>::infinity());
if (is_constant_evaluated())
return !isnan(value) && value != inf && value != -inf;
return std::isfinite(value);
}
template <typename T, FMT_ENABLE_IF(!has_isfinite<T>::value)>
constexpr bool isfinite(T value) {
return value - value == 0; // std::isfinite doesn't support __float128.
FMT_CONSTEXPR bool isfinite(T value) {
T inf = T(std::numeric_limits<double>::infinity());
// std::isfinite doesn't support __float128.
return !isnan(value) && value != inf && value != -inf;
}
template <typename T, FMT_ENABLE_IF(is_floating_point<T>::value)>