1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <deque>
11 
12 // void swap(deque& c)
13 //     noexcept(!allocator_type::propagate_on_container_swap::value ||
14 //              __is_nothrow_swappable<allocator_type>::value);
15 
16 // This tests a conforming extension
17 
18 #include <deque>
19 #include <cassert>
20 
21 #include "../../../MoveOnly.h"
22 #include "../../../test_allocator.h"
23 
24 template <class T>
25 struct some_alloc
26 {
27     typedef T value_type;
28 
29     some_alloc() {}
30     some_alloc(const some_alloc&);
31     void deallocate(void*, unsigned) {}
32 
33     typedef std::true_type propagate_on_container_swap;
34 };
35 
36 int main()
37 {
38 #if __has_feature(cxx_noexcept)
39     {
40         typedef std::deque<MoveOnly> C;
41         C c1, c2;
42         static_assert(noexcept(swap(c1, c2)), "");
43     }
44     {
45         typedef std::deque<MoveOnly, test_allocator<MoveOnly>> C;
46         C c1, c2;
47         static_assert(noexcept(swap(c1, c2)), "");
48     }
49     {
50         typedef std::deque<MoveOnly, other_allocator<MoveOnly>> C;
51         C c1, c2;
52         static_assert(noexcept(swap(c1, c2)), "");
53     }
54     {
55         typedef std::deque<MoveOnly, some_alloc<MoveOnly>> C;
56         C c1, c2;
57         static_assert(!noexcept(swap(c1, c2)), "");
58     }
59 #endif
60 }
61