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91 lines
2.5 KiB
C++
91 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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// <deque>
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// void swap(deque& 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>::is_always_equal::value);
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// This tests a conforming extension
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#include <deque>
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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 "MoveOnly.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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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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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(int, char**)
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{
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{
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typedef std::deque<MoveOnly> 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::deque<MoveOnly, test_allocator<MoveOnly>> C;
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static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
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}
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{
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typedef std::deque<MoveOnly, other_allocator<MoveOnly>> 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::deque<MoveOnly, some_alloc<MoveOnly>> 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::deque<MoveOnly, some_alloc2<MoveOnly>> 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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return 0;
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}
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