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to_chars_integer_STL_comp.cpp
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209 lines (176 loc) · 6.59 KB
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// Copyright 2023 Matt Borland
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/config.hpp>
#if !defined(BOOST_NO_CXX17_HDR_CHARCONV) && (!defined(__clang_major__) || (defined(__clang_major__) && __clang_major__ > 7))
#include <boost/charconv.hpp>
#include <boost/core/lightweight_test.hpp>
#include <charconv>
#include <type_traits>
#include <limits>
#include <cstring>
#include <cstdint>
#include <cerrno>
#include <utility>
#include <system_error>
#include <random>
#include <thread>
#include <vector>
template <typename T>
void stress_test_worker()
{
std::random_device rd;
std::mt19937_64 gen(rd());
std::uniform_int_distribution<T> dist((std::numeric_limits<T>::min)(), (std::numeric_limits<T>::max)());
std::mt19937_64 base_gen(rd());
std::uniform_int_distribution<int> base_dist(2, 36);
for (std::size_t i = 0; i < 100'000'000; ++i)
{
char buffer_stl[128] {};
char buffer_boost[128] {};
T v = dist(gen);
int base = base_dist(base_gen);
auto r_stl = std::to_chars(buffer_stl, buffer_stl + sizeof(buffer_stl) - 1, v, base);
auto r_boost = boost::charconv::to_chars(buffer_boost, buffer_boost + sizeof(buffer_boost) - 1, v, base);
BOOST_TEST_EQ(static_cast<std::ptrdiff_t>(r_stl.ptr - buffer_stl), static_cast<std::ptrdiff_t>(r_boost.ptr - buffer_boost));
BOOST_TEST_CSTR_EQ(buffer_stl, buffer_boost);
}
}
template <typename T>
void stress_test()
{
auto num_threads = std::thread::hardware_concurrency();
std::vector<std::thread> thread_manager(num_threads);
for (std::size_t i = 0; i < num_threads; ++i)
{
thread_manager.emplace_back(std::thread(stress_test_worker<T>));
}
for (std::size_t i = 0; i < thread_manager.size(); ++i)
{
if (thread_manager[i].joinable())
{
thread_manager[i].join();
}
}
}
template <typename T, int base = 10>
void random_tests()
{
std::mt19937_64 gen(42);
std::uniform_int_distribution<T> dist((std::numeric_limits<T>::min)(), (std::numeric_limits<T>::max)());
for (std::size_t i = 0; i < 100'000; ++i)
{
char buffer_stl[128] {};
char buffer_boost[128] {};
T v = dist(gen);
auto r_stl = std::to_chars(buffer_stl, buffer_stl + sizeof(buffer_stl) - 1, v, base);
auto r_boost = boost::charconv::to_chars(buffer_boost, buffer_boost + sizeof(buffer_boost) - 1, v, base);
BOOST_TEST_EQ(static_cast<std::ptrdiff_t>(r_stl.ptr - buffer_stl), static_cast<std::ptrdiff_t>(r_boost.ptr - buffer_boost));
BOOST_TEST_CSTR_EQ(buffer_stl, buffer_boost);
}
}
template <typename T>
void test()
{
// Signed 0
char buffer1_stl[64] {};
char buffer1_boost[64] {};
T v1 = static_cast<T>(-0);
auto r1_stl = std::to_chars(buffer1_stl, buffer1_stl + sizeof(buffer1_stl) - 1, v1);
auto r1_boost = boost::charconv::to_chars(buffer1_boost, buffer1_boost + sizeof(buffer1_boost) - 1, v1);
BOOST_TEST_EQ(r1_stl.ptr, buffer1_stl + 1);
BOOST_TEST_EQ(r1_boost.ptr, buffer1_boost + 1);
BOOST_TEST_CSTR_EQ(buffer1_stl, "0");
BOOST_TEST_CSTR_EQ(buffer1_boost, "0");
// Binary
char buffer2_stl[64] {};
char buffer2_boost[64] {};
T v2 = static_cast<T>(42);
auto r2_stl = std::to_chars(buffer2_stl, buffer2_stl + sizeof(buffer2_stl) - 1, v2, 2);
auto r2_boost = boost::charconv::to_chars(buffer2_boost, buffer2_boost + sizeof(buffer2_boost) - 1, v2, 2);
BOOST_TEST_EQ(r2_stl.ptr, buffer2_stl + 6);
BOOST_TEST_EQ(r2_boost.ptr, buffer2_boost + 6);
BOOST_TEST_CSTR_EQ(buffer2_stl, "101010");
BOOST_TEST_CSTR_EQ(buffer2_boost, "101010");
// Base 10
char buffer3_stl[64] {};
char buffer3_boost[64] {};
T v3 = static_cast<T>(120);
auto r3_stl = std::to_chars(buffer3_stl, buffer3_stl + sizeof(buffer3_stl) - 1, v3);
auto r3_boost = boost::charconv::to_chars(buffer3_boost, buffer3_boost + sizeof(buffer3_boost) - 1, v3);
BOOST_TEST_EQ(r3_stl.ptr, buffer3_stl + 3);
BOOST_TEST_EQ(r3_boost.ptr, buffer3_boost + 3);
BOOST_TEST_CSTR_EQ(buffer3_stl, "120");
BOOST_TEST_CSTR_EQ(buffer3_boost, "120");
// Hexadecimal
char buffer4_stl[64] {};
char buffer4_boost[64] {};
T v4 = static_cast<T>(44);
auto r4_stl = std::to_chars(buffer4_stl, buffer4_stl + sizeof(buffer4_stl) - 1, v4, 16);
auto r4_boost = boost::charconv::to_chars(buffer4_boost, buffer4_boost + sizeof(buffer4_boost) - 1, v4, 16);
BOOST_TEST_EQ(r4_stl.ptr, buffer4_stl + 2);
BOOST_TEST_EQ(r4_boost.ptr, buffer4_boost + 2);
BOOST_TEST_CSTR_EQ(buffer4_stl, "2c");
BOOST_TEST_CSTR_EQ(buffer4_boost, "2c");
// Base 28
char buffer5_stl[64] {};
char buffer5_boost[64] {};
T v5 = static_cast<T>(100);
auto r5_stl = std::to_chars(buffer5_stl, buffer5_stl + sizeof(buffer5_stl) - 1, v5, 28);
auto r5_boost = boost::charconv::to_chars(buffer5_boost, buffer5_boost + sizeof(buffer5_boost) - 1, v5, 28);
BOOST_TEST_EQ(r5_stl.ptr, buffer5_stl + 2);
BOOST_TEST_EQ(r5_boost.ptr, buffer5_boost + 2);
BOOST_TEST_CSTR_EQ(buffer5_stl, "3g");
BOOST_TEST_CSTR_EQ(buffer5_boost, "3g");
// Overflow
char buffer6_stl[1] {};
char buffer6_boost[1] {};
T v6 = static_cast<T>(100);
auto r6_stl = std::to_chars(buffer6_stl, buffer6_stl + sizeof(buffer6_stl) - 1, v6);
auto r6_boost = boost::charconv::to_chars(buffer6_boost, buffer6_boost + sizeof(buffer6_boost) - 1, v6);
BOOST_TEST_EQ(r6_stl.ptr, r6_stl.ptr);
BOOST_TEST_EQ(r6_boost.ptr, r6_boost.ptr);
}
int main()
{
test<char>();
test<signed char>();
test<unsigned char>();
test<short>();
test<unsigned short>();
test<int>();
test<unsigned>();
test<long>();
test<unsigned long>();
test<long long>();
test<unsigned long long>();
// Specialized bases
random_tests<int, 2>();
random_tests<int, 4>();
random_tests<int, 8>();
random_tests<int, 16>();
random_tests<int, 32>();
#ifndef _MSC_VER // MSVC does not allow for 8-bit ints in std::uniform_int_distribution
random_tests<std::int8_t, 10>();
random_tests<std::uint8_t, 10>();
#endif
random_tests<std::int16_t, 10>();
random_tests<std::uint16_t, 10>();
random_tests<std::int32_t, 10>();
random_tests<std::uint32_t, 10>();
random_tests<std::int64_t, 10>();
random_tests<std::uint64_t, 10>();
// Generic implementation
random_tests<int, 23>();
// Stress tests are disabled for CI
#ifdef BOOST_CHARCONV_STRESS_TEST
stress_test<int>();
#endif
return boost::report_errors();
}
#else
int main()
{
return 0;
}
#endif