mirror of
https://github.com/boostorg/charconv.git
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109 lines
2.3 KiB
C++
109 lines
2.3 KiB
C++
// Copyright 2023 Matt Borland
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/charconv/detail/integer_search_trees.hpp>
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#include <boost/charconv/detail/emulated128.hpp>
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#include <boost/charconv/config.hpp>
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#include <boost/core/lightweight_test.hpp>
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#include <type_traits>
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#include <limits>
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#if defined(__GNUC__) && (__GNUC__ < 7)
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Woverflow"
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#endif
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#ifdef BOOST_CHARCONV_HAS_INT128
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// Test the u128 impl
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template <typename T>
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void test128()
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{
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T max = BOOST_CHARCONV_UINT128_MAX;
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max /= 10;
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T val = 1;
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int i = 1;
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while (val < max)
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{
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BOOST_TEST_EQ(boost::charconv::detail::num_digits(val), i);
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++i;
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val *= 10;
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}
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BOOST_TEST_EQ(boost::charconv::detail::num_digits(max * 10), 39);
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}
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#endif
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#if defined(__GNUC__) && (__GNUC__ < 7)
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# pragma GCC diagnostic pop
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#endif
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#if defined(__GNUC__) && (__GNUC__ >= 5)
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wconversion"
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#endif
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// Tests the generic, u32, and u64 impls
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template <typename T>
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void test()
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{
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constexpr T max = (std::numeric_limits<T>::max)() / 10;
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T val = 1;
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int i = 1;
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while (val < max)
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{
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BOOST_TEST_EQ(boost::charconv::detail::num_digits(val), i);
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++i;
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val *= static_cast<T>(10);
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}
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BOOST_TEST_EQ(boost::charconv::detail::num_digits(val), std::numeric_limits<T>::digits10 + 1);
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}
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#if defined(__GNUC__) && (__GNUC__ >= 5)
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# pragma GCC diagnostic pop
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#endif
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void test_emulated128()
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{
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using namespace boost::charconv::detail;
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uint128 v1 {0, 1234};
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BOOST_TEST_EQ(num_digits(v1), 4);
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uint128 v2 {1234, 0};
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BOOST_TEST_EQ(num_digits(v2), 23);
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uint128 v3 {UINT64_MAX, UINT64_MAX};
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BOOST_TEST_EQ(num_digits(v3), 39);
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}
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int main()
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{
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test<char>();
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test<signed char>();
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test<unsigned char>();
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test<short>();
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test<unsigned short>();
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test<int>();
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test<unsigned>();
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test<long>();
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test<unsigned long>();
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test<long long>();
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test<unsigned long long>();
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// Specialized tables
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test<std::uint32_t>();
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test<std::uint64_t>();
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#ifdef BOOST_CHARCONV_HAS_INT128
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test128<boost::uint128_type>();
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#endif
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test_emulated128();
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return boost::report_errors();
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}
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