mirror of
https://github.com/boostorg/charconv.git
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80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
// Copyright 2025 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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//
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// See: https://github.com/boostorg/charconv/issues/282
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#include <boost/charconv.hpp>
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#include <boost/core/lightweight_test.hpp>
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template <std::size_t size>
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void test_no_format()
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{
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char buffer[size];
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const auto r = boost::charconv::to_chars(buffer, buffer + size, 0.1);
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if (BOOST_TEST(r))
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{
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*r.ptr = '\0';
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BOOST_TEST_CSTR_EQ(buffer, "0.1");
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}
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}
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template <std::size_t size>
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void test_with_format()
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{
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char buffer[size];
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const auto r = boost::charconv::to_chars(buffer, buffer + size, 0.1, boost::charconv::chars_format::general);
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if (BOOST_TEST(r))
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{
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*r.ptr = '\0';
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BOOST_TEST_CSTR_EQ(buffer, "0.1");
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}
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}
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template <std::size_t size>
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void test_smaller(const double value, const char* res)
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{
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char buffer[size];
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const auto r = boost::charconv::to_chars(buffer, buffer + size, value, boost::charconv::chars_format::general);
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if (BOOST_TEST(r))
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{
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*r.ptr = '\0';
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BOOST_TEST_CSTR_EQ(buffer, res);
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}
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}
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int main()
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{
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test_no_format<20>();
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test_no_format<100>();
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test_no_format<boost::charconv::limits<double>::max_chars10>();
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test_with_format<20>();
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test_with_format<100>();
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test_with_format<boost::charconv::limits<double>::max_chars10>();
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// The following match the behavior of GCC 15.2
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// 0.01 vs 1e-02
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test_smaller<20>(0.01, "0.01");
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test_smaller<100>(0.01, "0.01");
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test_smaller<boost::charconv::limits<double>::max_chars10>(0.01, "0.01");
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// 0.001 vs 1e-03
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test_smaller<20>(0.001, "0.001");
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test_smaller<100>(0.001, "0.001");
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test_smaller<boost::charconv::limits<double>::max_chars10>(0.001, "0.001");
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// 0.0001 vs 1e-04
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test_smaller<20>(0.0001, "0.0001");
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test_smaller<100>(0.0001, "0.0001");
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test_smaller<boost::charconv::limits<double>::max_chars10>(0.0001, "0.0001");
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// 0.00001 vs 1e-05
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test_smaller<20>(0.00001, "1e-05");
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test_smaller<100>(0.00001, "1e-05");
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test_smaller<boost::charconv::limits<double>::max_chars10>(0.00001, "1e-05");
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return boost::report_errors();
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}
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