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Work floff into to_chars

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This commit is contained in:
Matt Borland
2023-03-22 10:20:33 -07:00
parent e9e95f640f
commit d7ebadb2fc
2 changed files with 28 additions and 10 deletions
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16
include/boost/charconv/to_chars.hpp
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@@ -12,8 +12,9 @@
#include <boost/charconv/detail/integer_conversion.hpp>
#include <boost/charconv/detail/memcpy.hpp>
#include <boost/charconv/detail/config.hpp>
#include <boost/charconv/detail/dragonbox.hpp>
#include <boost/charconv/detail/floff.hpp>
#include <boost/charconv/config.hpp>
#include <boost/charconv/chars_format.hpp>
#include <type_traits>
#include <array>
#include <limits>
@@ -455,7 +456,7 @@ BOOST_CHARCONV_CONSTEXPR to_chars_result to_chars128(char* first, char* last, In
// ---------------------------------------------------------------------------------------------------------------------
// Floating Point Detail
// ---------------------------------------------------------------------------------------------------------------------
/*
template <typename Float, typename FloatTraits>
extern char* to_chars(typename FloatTraits::carrier_uint significand, int exponent, char* buffer) noexcept;
@@ -463,7 +464,7 @@ extern char* to_chars(typename FloatTraits::carrier_uint significand, int expone
template <typename PolicyHolder, typename Float, typename FloatTraits>
char* to_chars_n_impl(float_bits<Float, FloatTraits> br, char* buffer) noexcept
{
const auto exponent_bits = br.extract_exponent_bits();
const static auto exponent_bits = br.extract_exponent_bits();
const auto s = br.remove_exponent_bits(exponent_bits);
if (br.is_finite(exponent_bits))
@@ -537,7 +538,7 @@ void print_1_digit(std::uint32_t n, char* buffer) noexcept;
void print_2_digits(std::uint32_t n, char* buffer) noexcept;
void print_9_digits(std::uint32_t s32, int& exponent, char* buffer) noexcept;
*/
} // Namespace detail
// integer overloads
@@ -599,9 +600,10 @@ BOOST_CHARCONV_CONSTEXPR to_chars_result to_chars(char* first, char* last, boost
#endif
// floating point overloads
BOOST_CHARCONV_DECL to_chars_result to_chars( char* first, char* last, float value ) noexcept;
BOOST_CHARCONV_DECL to_chars_result to_chars( char* first, char* last, double value ) noexcept;
BOOST_CHARCONV_DECL to_chars_result to_chars( char* first, char* last, long double value ) noexcept;
BOOST_CHARCONV_DECL to_chars_result to_chars(char* first, char* last, float value ) noexcept;
BOOST_CHARCONV_DECL to_chars_result to_chars(char* first, char* last, double value,
chars_format fmt = chars_format::general, int precision = -1 ) noexcept;
BOOST_CHARCONV_DECL to_chars_result to_chars(char* first, char* last, long double value ) noexcept;
} // namespace charconv
} // namespace boost

22
src/to_chars.cpp
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@@ -286,10 +286,26 @@ boost::charconv::to_chars_result boost::charconv::to_chars( char* first, char* l
return { first + std::strlen(first), 0 };
}
boost::charconv::to_chars_result boost::charconv::to_chars( char* first, char* last, double value ) noexcept
boost::charconv::to_chars_result boost::charconv::to_chars(char* first, char* last, double value, boost::charconv::chars_format fmt, int precision) noexcept
{
std::snprintf( first, last - first, "%.*g", std::numeric_limits<double>::max_digits10, value );
return { first + std::strlen(first), 0 };
(void)fmt;
if (precision == -1)
{
precision = std::numeric_limits<double>::max_digits10;
}
if (precision > static_cast<std::ptrdiff_t>(last - first))
{
return { first, EOVERFLOW };
}
auto* ptr = jkj::floff::floff<jkj::floff::main_cache_full, jkj::floff::extended_cache_long>(value, precision, first);
while (*ptr == '0')
{
--ptr;
}
return { ptr, 0 };
//std::snprintf( first, last - first, "%.*g", std::numeric_limits<double>::max_digits10, value );
//return { first + std::strlen(first), 0 };
}
boost::charconv::to_chars_result boost::charconv::to_chars( char* first, char* last, long double value ) noexcept