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 // <string>
11
12 // void swap(basic_string& 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 <string>
19 #include <cassert>
20
21 #include "test_allocator.h"
22
23 template <class T>
24 struct some_alloc
25 {
26 typedef T value_type;
27
some_allocsome_alloc28 some_alloc() {}
29 some_alloc(const some_alloc&);
deallocatesome_alloc30 void deallocate(void*, unsigned) {}
31
32 typedef std::true_type propagate_on_container_swap;
33 };
34
main()35 int main()
36 {
37 #if __has_feature(cxx_noexcept)
38 {
39 typedef std::string C;
40 C c1, c2;
41 static_assert(noexcept(swap(c1, c2)), "");
42 }
43 {
44 typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C;
45 C c1, c2;
46 static_assert(noexcept(swap(c1, c2)), "");
47 }
48 {
49 typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C;
50 C c1, c2;
51 static_assert(!noexcept(swap(c1, c2)), "");
52 }
53 #endif
54 }
55