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// 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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