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Add initial support for double-double

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This commit is contained in:
Victor Zverovich 2022-04-24 07:43:02 -07:00
parent ffb5e6a732
commit 7e4ad40171
1 changed files with 18 additions and 4 deletions
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22
include/fmt/format.h
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@ -1303,6 +1303,13 @@ struct float_info<T, enable_if_t<std::numeric_limits<T>::digits == 64 ||
static const int exponent_bits = 15;
};
// A double-double floating point number.
template <typename T>
struct float_info<T, enable_if_t<std::numeric_limits<T>::digits >= 106 &&
!std::numeric_limits<T>::is_iec559>> {
using carrier_uint = detail::uint128_t;
};
template <typename T> struct decimal_fp {
using significand_type = typename float_info<T>::carrier_uint;
significand_type significand;
@ -2321,13 +2328,20 @@ template <typename T> constexpr bool isnan(T value) {
return !(value >= value); // std::isnan doesn't support __float128.
}
template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value &&
!is_float128<T>::value)>
template <typename T, typename Enable = void>
struct has_isfinite : std::false_type {};
template <typename T>
struct has_isfinite<T, enable_if_t<sizeof(std::isfinite(T())) != 0>>
: std::true_type {};
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);
return std::isfinite(value);
}
template <typename T, FMT_ENABLE_IF(is_float128<T>::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.
}
@ -2525,7 +2539,7 @@ template <typename Char, typename OutputIt, typename T,
typename Context = basic_format_context<OutputIt, Char>>
FMT_CONSTEXPR auto write(OutputIt out, const T& value) -> enable_if_t<
std::is_class<T>::value && !is_string<T>::value &&
!std::is_same<T, Char>::value &&
!is_floating_point<T>::value && !std::is_same<T, Char>::value &&
!std::is_same<const T&,
decltype(arg_mapper<Context>().map(value))>::value,
OutputIt> {