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Propagate noexcept specification in boost::swap.

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Mark boost::swap noexcept if the type supports non-throwing swap
implementation.
This commit is contained in:
Andrey Semashev
2023-01-07 01:52:02 +03:00
parent 99f9654f18
commit 8a8738a981
5 changed files with 88 additions and 25 deletions
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42
test/swap/swap_noexcept.cpp Normal file
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// Copyright (c) 2023 Andrey Semashev
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Tests that boost::swap propagates noexcept specification correctly
#include <boost/core/swap.hpp>
#include <boost/config.hpp>
#if !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_CXX11_STATIC_ASSERT) && \
!(defined(BOOST_GCC) && (BOOST_GCC < 40700))
namespace test_ns {
struct class_with_noexcept_swap
{
static class_with_noexcept_swap& instance() noexcept;
friend void swap(class_with_noexcept_swap&, class_with_noexcept_swap&) noexcept
{
}
};
struct class_with_except_swap
{
static class_with_except_swap& instance() noexcept;
friend void swap(class_with_except_swap&, class_with_except_swap&)
{
}
};
} // namespace test_ns
static_assert(noexcept(boost::swap(test_ns::class_with_noexcept_swap::instance(), test_ns::class_with_noexcept_swap::instance())),
"boost::swap for class_with_noexcept_swap should have noexcept specification");
static_assert(!noexcept(boost::swap(test_ns::class_with_except_swap::instance(), test_ns::class_with_except_swap::instance())),
"boost::swap for class_with_except_swap should not have noexcept specification");
#endif // !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_CXX11_STATIC_ASSERT) ...