mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2025-07-04 14:14:09 +00:00
fix to_string
This commit is contained in:
bolero-MURAKAMI
parent
08def386b5
commit
e5391d339c
2 changed files with 126 additions and 171 deletions
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@ -2,14 +2,11 @@
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#define SPROUT_STRING_FLOAT_TO_STRING_HPP
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#include <cstddef>
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#include <cstdint>
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#include <cmath>
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#include <limits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/string/string.hpp>
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#include <sprout/string/make_string.hpp>
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#include <sprout/integer/integer_digits.hpp>
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#include <sprout/utility/enabler_if.hpp>
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#include <sprout/detail/char_conversion.hpp>
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@ -25,113 +22,84 @@ namespace sprout {
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struct printed_float_digits
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: public std::integral_constant<
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std::size_t,
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/*std::numeric_limits<floatFloatType>::max_exponent10 + sprout::detail::decimal_places_length + 3*/
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sprout::integer_digits<std::intmax_t>::value + sprout::detail::decimal_places_length + 3
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std::numeric_limits<FloatType>::max_exponent10 + sprout::detail::decimal_places_length + 2
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>
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{};
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namespace detail {
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template<typename FloatType>
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inline SPROUT_CONSTEXPR unsigned float_extract_rounded_impl(FloatType val) {
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return static_cast<unsigned>(val * 1000000)
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+ (static_cast<unsigned>(val * 10000000) % 10 >= 5 ? 1 : 0)
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inline SPROUT_CONSTEXPR FloatType
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float_pow10(int exponent) {
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return exponent ? FloatType(10) * sprout::detail::float_pow10<FloatType>(exponent - 1)
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: FloatType(1)
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;
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}
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template<typename FloatType>
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inline SPROUT_CONSTEXPR int
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float_digits_impl(FloatType val) {
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return !(val < 1 && val > -1) ? 1 + sprout::detail::float_digits_impl(val / 10)
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: 0
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;
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}
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template<typename FloatType>
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inline SPROUT_CONSTEXPR unsigned float_extract_rounded(FloatType val) {
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inline SPROUT_CONSTEXPR int
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float_digits(FloatType val) {
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return !(val < 1 && val > -1) ? 1 + sprout::detail::float_digits_impl(val / 10)
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: 1
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;
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}
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template<typename FloatType>
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inline SPROUT_CONSTEXPR int
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float_digit_of_impl(FloatType val) {
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using std::floor;
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return sprout::detail::float_extract_rounded_impl(val - floor(val));
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return static_cast<int>((val - floor(val)) * 10);
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}
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template<
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typename Elem,
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typename FloatType,
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typename... Args,
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typename sprout::enabler_if<(sizeof...(Args) == sprout::printed_float_digits<FloatType>::value - 1)>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
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float_to_string_impl_1(FloatType val, bool negative, Args... args) {
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return negative ? sprout::make_string_as<Elem>(static_cast<Elem>('-'), args...)
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: sprout::make_string_as<Elem>(args...)
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;
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}
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template<
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typename Elem,
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typename FloatType,
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typename... Args,
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typename sprout::enabler_if<(sizeof...(Args) < sprout::printed_float_digits<FloatType>::value - 1)>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
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float_to_string_impl_1(FloatType val, bool negative, Args... args) {
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return !(val < 1) ? sprout::detail::float_to_string_impl_1<Elem>(
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val / 10,
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negative,
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sprout::detail::int_to_char<Elem>(static_cast<std::uintmax_t>(val) % 10),
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args...
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)
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: negative ? sprout::make_string_as<Elem>(static_cast<Elem>('-'), args...)
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: sprout::make_string_as<Elem>(args...)
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template<typename FloatType>
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inline SPROUT_CONSTEXPR int
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float_digit_of(FloatType val, int digits) {
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return digits < 0 ? sprout::detail::float_digit_of_impl(val * sprout::detail::float_pow10<FloatType>(-digits - 1))
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: sprout::detail::float_digit_of_impl(val / sprout::detail::float_pow10<FloatType>(digits + 1))
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;
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}
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template<
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typename Elem,
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typename FloatType,
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typename... Args,
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typename sprout::enabler_if<(sizeof...(Args) == sprout::printed_float_digits<FloatType>::value - 3)>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
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float_to_string_impl(FloatType val, bool negative, unsigned temp, std::size_t decimal_digits, Args... args) {
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return negative ? sprout::make_string_as<Elem>(static_cast<Elem>('-'), static_cast<Elem>('0'), static_cast<Elem>('.'), args...)
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: sprout::make_string_as<Elem>(static_cast<Elem>('0'), static_cast<Elem>('.'), args...)
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;
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template<typename FloatType>
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inline SPROUT_CONSTEXPR FloatType
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float_round_impl(FloatType val, FloatType p10) {
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using std::round;
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return round(val * p10) / p10;
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}
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template<
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typename Elem,
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typename FloatType,
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typename... Args,
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typename sprout::enabler_if<(sizeof...(Args) < sprout::printed_float_digits<FloatType>::value - 3)>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
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float_to_string_impl(FloatType val, bool negative, unsigned temp, std::size_t decimal_digits, Args... args) {
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return decimal_digits ? sprout::detail::float_to_string_impl<Elem>(
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val,
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negative,
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temp / 10,
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decimal_digits - 1,
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sprout::detail::int_to_char<Elem>(temp % 10),
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args...
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)
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: !(val < 1) ? sprout::detail::float_to_string_impl_1<Elem>(
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val,
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negative,
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static_cast<Elem>('.'),
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args...
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)
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: negative ? sprout::make_string_as<Elem>(static_cast<Elem>('-'), static_cast<Elem>('0'), static_cast<Elem>('.'), args...)
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: sprout::make_string_as<Elem>(static_cast<Elem>('0'), static_cast<Elem>('.'), args...)
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;
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template<typename FloatType>
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inline SPROUT_CONSTEXPR FloatType
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float_round(FloatType val, int digits) {
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return sprout::detail::float_round_impl(val, sprout::detail::float_pow10<FloatType>(digits));
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}
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template<
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typename Elem,
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typename FloatType
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>
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template<typename Elem, typename FloatType, sprout::index_t... Indexes>
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inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
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float_to_string(FloatType val) {
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using std::floor;
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return val < 0 ? sprout::detail::float_to_string_impl<Elem>(
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-val,
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true,
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sprout::detail::float_extract_rounded(-val),
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sprout::detail::decimal_places_length
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)
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: sprout::detail::float_to_string_impl<Elem>(
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val,
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false,
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sprout::detail::float_extract_rounded(val),
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sprout::detail::decimal_places_length
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)
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float_to_string(FloatType val, bool negative, int digits, sprout::index_tuple<Indexes...>) {
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return negative ? sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>{
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{
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static_cast<Elem>('-'),
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(Indexes < digits ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_of(val, digits - 1 - Indexes))
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: Indexes == digits ? static_cast<Elem>('.')
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: Indexes < digits + 1 + sprout::detail::decimal_places_length ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_of(val, digits - Indexes))
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: Elem()
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)...
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},
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static_cast<std::size_t>(digits + 2 + sprout::detail::decimal_places_length)
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}
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: sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>{
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{
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(Indexes < digits ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_of(val, digits - 1 - Indexes))
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: Indexes == digits ? static_cast<Elem>('.')
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: Indexes < digits + 1 + sprout::detail::decimal_places_length ? sprout::detail::int_to_char<Elem>(sprout::detail::float_digit_of(val, digits - Indexes))
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: Elem()
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)...
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},
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static_cast<std::size_t>(digits + 1 + sprout::detail::decimal_places_length)
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}
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;
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}
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} // namespace detail
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@ -146,7 +114,12 @@ namespace sprout {
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>
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inline SPROUT_CONSTEXPR sprout::basic_string<Elem, sprout::printed_float_digits<FloatType>::value>
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float_to_string(FloatType val) {
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return sprout::detail::float_to_string<Elem>(val);
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return sprout::detail::float_to_string<Elem>(
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sprout::detail::float_round(val < 0 ? -val : val, sprout::detail::decimal_places_length),
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val < 0,
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sprout::detail::float_digits(val),
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sprout::index_range<0, sprout::printed_float_digits<FloatType>::value - 1>::make()
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);
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}
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//
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