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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
#include <boost/charconv.hpp>
#include <boost/core/lightweight_test.hpp>
#include <system_error>
#include <limits>
#include <random>
#include <array>
#include <cstdint>
#include <iomanip>
constexpr std::size_t N = 1024;
static std::mt19937_64 rng(42);
template <typename T>
void test_non_finite()
{
constexpr std::array<T, 6> values = {{std::numeric_limits<T>::infinity(), -std::numeric_limits<T>::infinity(),
std::numeric_limits<T>::quiet_NaN(), -std::numeric_limits<T>::quiet_NaN(),
std::numeric_limits<T>::signaling_NaN(), -std::numeric_limits<T>::signaling_NaN()}};
for (const auto val : values)
{
char buffer[2];
auto r = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), val);
BOOST_TEST(r.ec == std::errc::value_too_large);
}
char inf_buffer[3];
constexpr T inf_val = std::numeric_limits<T>::infinity();
auto r_inf = boost::charconv::to_chars(inf_buffer, inf_buffer + 3, inf_val);
BOOST_TEST(r_inf);
BOOST_TEST(!std::memcmp(inf_buffer, "inf", 3));
char nan_buffer[3];
constexpr T nan_val = std::numeric_limits<T>::quiet_NaN();
auto r_nan = boost::charconv::to_chars(nan_buffer, nan_buffer + 3, nan_val);
BOOST_TEST(r_nan);
BOOST_TEST(!std::memcmp(nan_buffer, "nan", 3));
char neg_nan_buffer[9];
auto r_neg_nan = boost::charconv::to_chars(neg_nan_buffer, neg_nan_buffer + 9, -nan_val);
BOOST_TEST(r_neg_nan);
BOOST_TEST(!std::memcmp(neg_nan_buffer, "-nan(ind)", 9));
char snan_buffer[9];
constexpr T snan_val = std::numeric_limits<T>::signaling_NaN();
auto r_snan = boost::charconv::to_chars(snan_buffer, snan_buffer + 9, snan_val);
BOOST_TEST(r_snan);
BOOST_TEST(!std::memcmp(snan_buffer, "nan(snan)", 9));
}
template <typename T>
void test_non_finite_fixed_precision()
{
constexpr std::array<T, 6> values = {{std::numeric_limits<T>::infinity(), -std::numeric_limits<T>::infinity(),
std::numeric_limits<T>::quiet_NaN(), -std::numeric_limits<T>::quiet_NaN(),
std::numeric_limits<T>::signaling_NaN(), -std::numeric_limits<T>::signaling_NaN()}};
const auto formats = {boost::charconv::chars_format::scientific, boost::charconv::chars_format::hex,
boost::charconv::chars_format::general, boost::charconv::chars_format::fixed};
for (auto format : formats)
{
for (const auto val : values)
{
char buffer[2];
auto r = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), val, format, 5);
BOOST_TEST(r.ec == std::errc::value_too_large);
}
char inf_buffer[3];
constexpr T inf_val = std::numeric_limits<T>::infinity();
auto r_inf = boost::charconv::to_chars(inf_buffer, inf_buffer + 3, inf_val, format, 5);
BOOST_TEST(r_inf);
BOOST_TEST(!std::memcmp(inf_buffer, "inf", 3));
char nan_buffer[3];
constexpr T nan_val = std::numeric_limits<T>::quiet_NaN();
auto r_nan = boost::charconv::to_chars(nan_buffer, nan_buffer + 3, nan_val, format, 5);
BOOST_TEST(r_nan);
BOOST_TEST(!std::memcmp(nan_buffer, "nan", 3));
char neg_nan_buffer[9];
auto r_neg_nan = boost::charconv::to_chars(neg_nan_buffer, neg_nan_buffer + 9, -nan_val, format, 5);
BOOST_TEST(r_neg_nan);
BOOST_TEST(!std::memcmp(neg_nan_buffer, "-nan(ind)", 9));
char snan_buffer[9];
constexpr T snan_val = std::numeric_limits<T>::signaling_NaN();
auto r_snan = boost::charconv::to_chars(snan_buffer, snan_buffer + 9, snan_val, format, 5);
BOOST_TEST(r_snan);
BOOST_TEST(!std::memcmp(snan_buffer, "nan(snan)", 9));
}
};
#ifdef BOOST_MSVC
# pragma warning(push)
# pragma warning(disable: 4127)
#endif
template <typename T>
void test_min_buffer_size()
{
#if defined(_WIN32)
std::uniform_real_distribution<T> dist((std::numeric_limits<T>::min)(), (std::numeric_limits<T>::max)());
#else
std::uniform_real_distribution<T> dist((std::numeric_limits<T>::lowest)(), (std::numeric_limits<T>::max)());
#endif
// No guarantees are made for fixed, especially in this domain
auto formats = {boost::charconv::chars_format::hex,
boost::charconv::chars_format::scientific,
boost::charconv::chars_format::general};
int format_int = 0;
for (const auto format : formats)
{
for (std::size_t i = 0; i < N; ++i)
{
char buffer[boost::charconv::limits<T>::max_chars10];
const T value = dist(rng);
if (!std::isnormal(value))
{
continue;
}
auto r = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), value, format);
if (!BOOST_TEST(r))
{
// LCOV_EXCL_START
std::cerr << std::setprecision(std::numeric_limits<T>::max_digits10) << "Overflow for: " << value
<< "\nFormat: " << format_int
<< "\nBuffer size: " << sizeof(buffer) << std::endl;
// LCOV_EXCL_STOP
}
}
++format_int;
}
}
#ifdef BOOST_MSVC
# pragma warning(pop)
#endif
#if BOOST_CHARCONV_LDBL_BITS > 64
void test_failed_values()
{
// No guarantees are made for fixed, especially in this domain
// TODO(mborland): Add hex once https://github.com/boostorg/charconv/issues/154 is fixed
auto formats = {boost::charconv::chars_format::scientific,
boost::charconv::chars_format::general};
std::array<long double, 2> failed_values = {{6.93880126833169422964e+4931L, 9.14517491001980558957e+4931L}};
int format_int = 0;
for (const auto format : formats)
{
for (const auto value : failed_values)
{
char buffer[boost::charconv::limits<long double>::max_chars10];
if (!std::isnormal(value))
{
continue;
}
auto r = boost::charconv::to_chars(buffer, buffer + sizeof(buffer), value, format);
if (!BOOST_TEST(r))
{
// LCOV_EXCL_START
std::cerr << std::setprecision(std::numeric_limits<long double>::max_digits10) << "Overflow for: " << value
<< "\nFormat: " << format_int
<< "\nBuffer size: " << sizeof(buffer) << std::endl;
// LCOV_EXCL_STOP
}
}
++format_int;
}
}
#endif
int main()
{
test_non_finite<float>();
test_non_finite<double>();
#ifdef BOOST_CHARCONV_HAS_FLOAT16
test_non_finite<std::float16_t>();
#endif
#ifdef BOOST_CHARCONV_HAS_FLOAT32
test_non_finite<std::float32_t>();
#endif
#ifdef BOOST_CHARCONV_HAS_FLOAT64
test_non_finite<std::float64_t>();
#endif
#ifdef BOOST_CHARCONV_HAS_BRAINFLOAT16
test_non_finite<std::bfloat16_t>();
#endif
test_non_finite_fixed_precision<float>();
test_non_finite_fixed_precision<double>();
#ifdef BOOST_CHARCONV_HAS_FLOAT16
test_non_finite_fixed_precision<std::float16_t>();
#endif
#ifdef BOOST_CHARCONV_HAS_FLOAT32
test_non_finite_fixed_precision<std::float32_t>();
#endif
#ifdef BOOST_CHARCONV_HAS_FLOAT64
test_non_finite_fixed_precision<std::float64_t>();
#endif
#ifdef BOOST_CHARCONV_HAS_BRAINFLOAT16
test_non_finite_fixed_precision<std::bfloat16_t>();
#endif
test_min_buffer_size<float>();
test_min_buffer_size<double>();
#ifdef BOOST_CHARCONV_HAS_FLOAT32
test_min_buffer_size<std::float32_t>();
#endif
#ifdef BOOST_CHARCONV_HAS_FLOAT64
test_min_buffer_size<std::float64_t>();
#endif
#if BOOST_CHARCONV_LDBL_BITS > 64
test_failed_values();
#endif
#ifndef BOOST_CHARCONV_UNSUPPORTED_LONG_DOUBLE
test_non_finite<long double>();
test_non_finite_fixed_precision<long double>();
test_min_buffer_size<long double>();
#endif
return boost::report_errors();
}
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