1 //===----------------------------------------------------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
14 // noexcept(!allocator_type::propagate_on_container_swap::value ||
15 // __is_nothrow_swappable<allocator_type>::value);
17 // In C++17, the standard says that swap shall have:
18 // noexcept(allocator_traits<Allocator>::is_always_equal::value);
20 // This tests a conforming extension
26 #include "test_macros.h"
28 #include "test_allocator.h"
36 some_alloc(const some_alloc
&);
37 void deallocate(void*, unsigned) {}
39 typedef std::true_type propagate_on_container_swap
;
48 some_alloc2(const some_alloc2
&);
49 void deallocate(void*, unsigned) {}
51 typedef std::false_type propagate_on_container_swap
;
52 typedef std::true_type is_always_equal
;
58 typedef std::list
<MoveOnly
> C
;
59 static_assert(noexcept(swap(std::declval
<C
&>(), std::declval
<C
&>())), "");
61 #if defined(_LIBCPP_VERSION)
63 typedef std::list
<MoveOnly
, test_allocator
<MoveOnly
>> C
;
64 static_assert(noexcept(swap(std::declval
<C
&>(), std::declval
<C
&>())), "");
67 typedef std::list
<MoveOnly
, other_allocator
<MoveOnly
>> C
;
68 static_assert(noexcept(swap(std::declval
<C
&>(), std::declval
<C
&>())), "");
70 #endif // _LIBCPP_VERSION
72 typedef std::list
<MoveOnly
, some_alloc
<MoveOnly
>> C
;
73 #if TEST_STD_VER >= 14
74 // In C++14, if POCS is set, swapping the allocator is required not to throw
75 static_assert( noexcept(swap(std::declval
<C
&>(), std::declval
<C
&>())), "");
77 static_assert(!noexcept(swap(std::declval
<C
&>(), std::declval
<C
&>())), "");
80 #if TEST_STD_VER >= 14
82 typedef std::list
<MoveOnly
, some_alloc2
<MoveOnly
>> C
;
83 // if the allocators are always equal, then the swap can be noexcept
84 static_assert( noexcept(swap(std::declval
<C
&>(), std::declval
<C
&>())), "");