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 // basic_string(basic_string&&)
13 //        noexcept(is_nothrow_move_constructible<allocator_type>::value);
14 
15 // This tests a conforming extension
16 
17 #include <string>
18 #include <cassert>
19 
20 #include "test_macros.h"
21 #include "test_allocator.h"
22 
23 template <class T>
24 struct some_alloc
25 {
26     typedef T value_type;
27     some_alloc(const some_alloc&);
28 };
29 
main()30 int main()
31 {
32 #if __has_feature(cxx_noexcept)
33     {
34         typedef std::string C;
35         static_assert(std::is_nothrow_move_constructible<C>::value, "");
36     }
37     {
38         typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C;
39         static_assert(std::is_nothrow_move_constructible<C>::value, "");
40     }
41     {
42         typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C;
43 #if TEST_STD_VER <= 14
44         static_assert(!std::is_nothrow_move_constructible<C>::value, "");
45 #else
46         static_assert( std::is_nothrow_move_constructible<C>::value, "");
47 #endif
48     }
49 #endif
50 }
51