1 // Copyright (C) 2018 Free Software Foundation, Inc.
2 //
3 // This file is part of the GNU ISO C++ Library. This library is free
4 // software; you can redistribute it and/or modify it under the
5 // terms of the GNU General Public License as published by the
6 // Free Software Foundation; either version 3, or (at your option)
7 // any later version.
8
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
13
14 // You should have received a copy of the GNU General Public License along
15 // with this library; see the file COPYING3. If not see
16 // <http://www.gnu.org/licenses/>.
17
18 // { dg-do run { target c++11 } }
19
20 // PR libstdc++/87749
21
22 #include <string>
23 #include <testsuite_hooks.h>
24
25 bool oom = false;
26
27 template<typename T>
28 struct alloc
29 {
30 using value_type = T;
31
32 #if !_GLIBCXX_USE_CXX11_ABI
33 using size_type = unsigned long;
34 using difference_type = long;
35 using reference = T&;
36 using const_reference = T&;
37 using pointer = T*;
38 using const_pointer = const T*;
39 template<typename U>
40 struct rebind { using other = alloc<U>; };
41 #endif
42
43 int not_empty = 0; // this makes is_always_equal false
44
45 alloc() = default;
46 template<typename U>
allocalloc47 alloc(const alloc<U>&) { }
48
allocatealloc49 T* allocate(unsigned long n)
50 {
51 if (oom)
52 throw std::bad_alloc();
53 return std::allocator<T>().allocate(n);
54 }
55
deallocatealloc56 void deallocate(T* p, unsigned long n)
57 {
58 std::allocator<T>().deallocate(p, n);
59 }
60 };
61
62 template<typename T, typename U>
operator ==(const alloc<T> &,const alloc<U> &)63 bool operator==(const alloc<T>&, const alloc<U>&) { return true; }
64
65 template<typename T, typename U>
operator !=(const alloc<T> &,const alloc<U> &)66 bool operator!=(const alloc<T>&, const alloc<U>&) { return false; }
67
main()68 int main()
69 {
70 using string
71 = std::basic_string<wchar_t, std::char_traits<wchar_t>, alloc<wchar_t>>;
72
73 string s = L"PR libstdc++/87749 a string that is longer than a short string";
74 const auto ptr = s.c_str();
75 oom = true;
76 string ss;
77 ss = std::move(s); // allocators are equal, should not allocate new storage
78 VERIFY( ss.c_str() == ptr );
79 }
80