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