57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03
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// <string>
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// void swap(basic_string& c)
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// noexcept(!allocator_type::propagate_on_container_swap::value ||
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// __is_nothrow_swappable<allocator_type>::value);
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//
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// In C++17, the standard says that swap shall have:
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// noexcept(allocator_traits<Allocator>::propagate_on_container_swap::value ||
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// allocator_traits<Allocator>::is_always_equal::value);
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// This tests a conforming extension
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#include <string>
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#include <utility>
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#include <cassert>
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#include "test_macros.h"
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#include "test_allocator.h"
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template <class T>
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struct some_alloc
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{
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typedef T value_type;
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some_alloc() {}
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some_alloc(const some_alloc&);
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T *allocate(size_t);
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void deallocate(void*, unsigned) {}
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typedef std::true_type propagate_on_container_swap;
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};
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template <class T>
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struct some_alloc2
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{
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typedef T value_type;
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some_alloc2() {}
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some_alloc2(const some_alloc2&);
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T *allocate(size_t);
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void deallocate(void*, unsigned) {}
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typedef std::false_type propagate_on_container_swap;
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typedef std::true_type is_always_equal;
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};
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int main()
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{
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{
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typedef std::string C;
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static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
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}
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#if defined(_LIBCPP_VERSION)
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{
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typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C;
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static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
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}
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#endif // _LIBCPP_VERSION
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{
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typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C;
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#if TEST_STD_VER >= 14
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// In C++14, if POCS is set, swapping the allocator is required not to throw
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static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
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#else
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static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
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#endif
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}
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#if TEST_STD_VER >= 14
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{
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typedef std::basic_string<char, std::char_traits<char>, some_alloc2<char>> C;
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// if the allocators are always equal, then the swap can be noexcept
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static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
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}
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#endif
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}
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