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// Copyright 2024 Matt Borland
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
//
// See: https://github.com/boostorg/charconv/issues/166
#include <boost/charconv.hpp>
#include <boost/core/lightweight_test.hpp>
#include <string>
template <typename T>
void test()
{
constexpr T value = 3746.348756384763L;
constexpr int precision = 6;
char buffer[1024];
const auto result = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), value, boost::charconv::chars_format::fixed, precision);
*result.ptr = '\0';
BOOST_TEST(result.ec == std::errc());
BOOST_TEST_EQ(std::string{buffer}, std::to_string(3746.348756));
}
template <typename T>
void rounding()
{
constexpr T value = 3746.348759784763L;
constexpr int precision = 6;
char buffer[1024];
const auto result = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), value, boost::charconv::chars_format::fixed, precision);
*result.ptr = '\0';
BOOST_TEST(result.ec == std::errc());
BOOST_TEST_EQ(std::string{buffer}, std::to_string(3746.348760));
}
template <typename T>
void more_rounding()
{
constexpr T value = 3746.89999999999999999L;
constexpr int precision = 6;
char buffer[1024];
const auto result = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), value, boost::charconv::chars_format::fixed, precision);
*result.ptr = '\0';
BOOST_TEST(result.ec == std::errc());
BOOST_TEST_EQ(std::string{buffer}, std::to_string(3746.900000));
}
template <typename T>
void further_rounding()
{
const std::array<std::string, 8U> solutions = {{
"3331.5",
"3331.52",
"3331.520",
"3331.5199",
"3331.51989",
"3331.519894",
"3331.5198945",
"3331.51989448"
}};
constexpr T value = 3331.519894481067353L;
for (int i = 1; i < 9; ++i)
{
char buffer[1024];
const auto result = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), value, boost::charconv::chars_format::fixed, i);
*result.ptr = '\0';
BOOST_TEST(result.ec == std::errc());
if (!BOOST_TEST_EQ(std::string(buffer), solutions[static_cast<std::size_t>(i - 1)]))
{
// LCOV_EXCL_START
std::cerr << "Precision: " << i
<< "\nExpected: " << solutions[static_cast<std::size_t>(i - 1)]
<< "\n Got: " << buffer << std::endl;
// LCOV_EXCL_STOP
}
}
}
template <typename T>
void full_rounding_test()
{
constexpr T value = 9999.999999999999999999L;
constexpr int precision = 6;
char buffer[1024];
const auto result = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), value, boost::charconv::chars_format::fixed, precision);
*result.ptr = '\0';
BOOST_TEST(result.ec == std::errc());
BOOST_TEST_EQ(std::string{buffer}, std::to_string(10000.000000));
}
template <typename T>
void test_zeros_path()
{
constexpr T value = 123456789.000000L;
constexpr int precision = 6;
char buffer[1024];
const auto result = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), value, boost::charconv::chars_format::fixed, precision);
*result.ptr = '\0';
BOOST_TEST(result.ec == std::errc());
BOOST_TEST_EQ(std::string{buffer}, std::to_string(123456789.000000));
}
int main()
{
#if BOOST_CHARCONV_LDBL_BITS == 80
test<long double>();
rounding<long double>();
more_rounding<long double>();
further_rounding<long double>();
full_rounding_test<long double>();
test_zeros_path<long double>();
#endif
#ifdef BOOST_CHARCONV_HAS_QUADMATH
test<__float128>();
rounding<__float128>();
more_rounding<__float128>();
further_rounding<__float128>();
full_rounding_test<__float128>();
test_zeros_path<__float128>();
#endif
#if defined(BOOST_CHARCONV_HAS_STDFLOAT128) && defined(BOOST_CHARCONV_HAS_QUADMATH)
test<std::float128_t>();
rounding<std::float128_t>();
more_rounding<std::float128_t>();
further_rounding<std::float128_t>();
full_rounding_test<std::float128_t>();
test_zeros_path<std::float128_t>();
#endif
return boost::report_errors();
}
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