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// Copyright 2025 Christopher Kormanyos
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/core/lightweight_test.hpp>
#include <boost/multiprecision/cpp_bin_float.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <array>
#include <cstddef>
#include <cstdint>
#include <limits>
namespace local {
template<typename FloatType, typename LongIshType>
auto test_max_convert() -> void
{
using float_type = FloatType;
using float_array_type = std::array<float_type, std::size_t { UINT8_C(7) }>;
const float_array_type factors =
{
float_type { "0.999" },
float_type { 1 },
float_type { "1.011" },
float_type { "2.022" },
float_type { "3.033" },
float_type { "4.044" },
float_type { "5.055" }
};
for(std::size_t i = std::size_t { UINT8_C(0) }; i < std::tuple_size<float_array_type>::value; ++i)
{
static_cast<void>(i);
using long_type = LongIshType;
const float_type
flt_val
{
float_type { (std::numeric_limits<long_type>::max)() } * factors[i]
};
const long_type conversion_result { static_cast<long_type>(flt_val) };
if(i == std::size_t { UINT8_C(0) })
{
BOOST_TEST(conversion_result < (std::numeric_limits<long_type>::max)());
}
else
{
BOOST_TEST(conversion_result == (std::numeric_limits<long_type>::max)());
}
}
}
namespace detail {
template<typename FloatType, typename LongIshType>
auto test_convert_neg_to_ll_types_impl(std::vector<LongIshType>& ll_ctrls) -> void
{
ll_ctrls.clear();
using float_type = FloatType;
using std::ldexp;
using float_array_type = std::array<float_type, std::size_t { UINT8_C(9) }>;
const float_array_type factors =
{
float_type { -ldexp(float_type { 1 }, -28) },
float_type { "-1.0E-9" },
float_type { "-0.999" },
float_type { -1 },
float_type { "-1.011" },
float_type { "-2.022" },
float_type { "-3.033" },
float_type { "-4.044" },
float_type { "-5.055" }
};
for(std::size_t i = std::size_t { UINT8_C(0) }; i < factors.size(); ++i)
{
static_cast<void>(i);
using float_type = FloatType;
using long_type = LongIshType;
const float_type
flt_val
{
static_cast<float_type>((std::numeric_limits<long_type>::max)()) * factors[i]
};
const long_type conversion_result { static_cast<long_type>(flt_val) };
ll_ctrls.push_back(conversion_result);
}
}
template<typename FloatType, typename LongIshType>
auto test_convert_pos_to_ll_types_impl(std::vector<LongIshType>& ll_ctrls) -> void
{
ll_ctrls.clear();
using float_type = FloatType;
using std::ldexp;
using float_array_type = std::array<float_type, std::size_t { UINT8_C(9) }>;
const float_array_type factors =
{
float_type { +ldexp(float_type { 1 }, -28) },
float_type { "+1.0E-9" },
float_type { "+0.999" },
float_type { -1 },
float_type { "+1.011" },
float_type { "+2.022" },
float_type { "+3.033" },
float_type { "+4.044" },
float_type { "+5.055" }
};
for(std::size_t i = std::size_t { UINT8_C(0) }; i < factors.size(); ++i)
{
static_cast<void>(i);
using float_type = FloatType;
using long_type = LongIshType;
const float_type
flt_val
{
static_cast<float_type>((std::numeric_limits<long_type>::max)()) * factors[i]
};
const long_type conversion_result { static_cast<long_type>(flt_val) };
ll_ctrls.push_back(conversion_result);
}
}
} // namespace detail
auto test_convert_pos_to_ll_types() -> void
{
std::vector<unsigned long long> ull_ctrls_dec;
std::vector<unsigned long long> ull_ctrls_bin;
std::vector<signed long long> sll_ctrls_dec;
std::vector<signed long long> sll_ctrls_bin;
detail::test_convert_pos_to_ll_types_impl<::boost::multiprecision::cpp_dec_float_50, unsigned long long>(ull_ctrls_dec);
detail::test_convert_pos_to_ll_types_impl<::boost::multiprecision::cpp_bin_float_50, unsigned long long>(ull_ctrls_bin);
detail::test_convert_pos_to_ll_types_impl<::boost::multiprecision::cpp_dec_float_50, signed long long>(sll_ctrls_dec);
detail::test_convert_pos_to_ll_types_impl<::boost::multiprecision::cpp_bin_float_50, signed long long>(sll_ctrls_bin);
BOOST_TEST(ull_ctrls_dec.size() == ull_ctrls_bin.size());
BOOST_TEST(!ull_ctrls_dec.empty());
for(std::size_t i { std::size_t { UINT8_C(0) } }; i < ull_ctrls_dec.size(); ++i)
{
BOOST_TEST(ull_ctrls_dec[i] == ull_ctrls_bin[i]);
}
BOOST_TEST(sll_ctrls_dec.size() == sll_ctrls_bin.size());
BOOST_TEST(!sll_ctrls_dec.empty());
for(std::size_t i { std::size_t { UINT8_C(0) } }; i < sll_ctrls_dec.size(); ++i)
{
BOOST_TEST(sll_ctrls_dec[i] == sll_ctrls_bin[i]);
}
}
auto test_convert_neg_to_ll_types() -> void
{
std::vector<unsigned long long> ull_ctrls_dec;
std::vector<unsigned long long> ull_ctrls_bin;
std::vector<signed long long> sll_ctrls_dec;
std::vector<signed long long> sll_ctrls_bin;
detail::test_convert_neg_to_ll_types_impl<::boost::multiprecision::cpp_dec_float_50, unsigned long long>(ull_ctrls_dec);
detail::test_convert_neg_to_ll_types_impl<::boost::multiprecision::cpp_bin_float_50, unsigned long long>(ull_ctrls_bin);
detail::test_convert_neg_to_ll_types_impl<::boost::multiprecision::cpp_dec_float_50, signed long long>(sll_ctrls_dec);
detail::test_convert_neg_to_ll_types_impl<::boost::multiprecision::cpp_bin_float_50, signed long long>(sll_ctrls_bin);
BOOST_TEST(ull_ctrls_dec.size() == ull_ctrls_bin.size());
BOOST_TEST(!ull_ctrls_dec.empty());
for(std::size_t i { std::size_t { UINT8_C(0) } }; i < ull_ctrls_dec.size(); ++i)
{
BOOST_TEST(ull_ctrls_dec[i] == ull_ctrls_bin[i]);
}
BOOST_TEST(sll_ctrls_dec.size() == sll_ctrls_bin.size());
BOOST_TEST(!sll_ctrls_dec.empty());
for(std::size_t i { std::size_t { UINT8_C(0) } }; i < sll_ctrls_dec.size(); ++i)
{
BOOST_TEST(sll_ctrls_dec[i] == sll_ctrls_bin[i]);
}
}
} // namespace local
auto main() -> int
{
local::test_max_convert<::boost::multiprecision::cpp_dec_float_50, unsigned long long>();
local::test_max_convert<::boost::multiprecision::cpp_bin_float_50, unsigned long long>();
local::test_max_convert<::boost::multiprecision::cpp_dec_float_50, signed long long>();
local::test_max_convert<::boost::multiprecision::cpp_bin_float_50, signed long long>();
local::test_convert_neg_to_ll_types();
local::test_convert_pos_to_ll_types();
return boost::report_errors();
}
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