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 // REQUIRES: c++experimental
11 // UNSUPPORTED: c++98, c++03
12 
13 // <experimental/memory_resource>
14 
15 // template <class T> class polymorphic_allocator
16 
17 // memory_resource *
18 // polymorphic_allocator<T>::resource() const
19 
20 #include <experimental/memory_resource>
21 #include <type_traits>
22 #include <cassert>
23 
24 namespace ex = std::experimental::pmr;
25 
main()26 int main()
27 {
28     typedef ex::polymorphic_allocator<void> A;
29     {
30         A const a;
31         static_assert(
32             std::is_same<decltype(a.resource()), ex::memory_resource*>::value
33           , ""
34           );
35     }
36     {
37         ex::memory_resource * mptr = (ex::memory_resource*)42;
38         A const a(mptr);
39         assert(a.resource() == mptr);
40     }
41     {
42         A const a(nullptr);
43         assert(a.resource() == nullptr);
44         assert(a.resource() == nullptr);
45     }
46     {
47         A const a;
48         assert(a.resource() == ex::get_default_resource());
49     }
50     {
51         ex::memory_resource * mptr = (ex::memory_resource*)42;
52         ex::set_default_resource(mptr);
53         A const a;
54         assert(a.resource() == mptr);
55         assert(a.resource() == ex::get_default_resource());
56     }
57 }
58