| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // UNSUPPORTED: c++03, c++11, c++14 |
| 10 | // TODO: Change to XFAIL once https://github.com/llvm/llvm-project/issues/40340 is fixed |
| 11 | // UNSUPPORTED: availability-pmr-missing |
| 12 | |
| 13 | // test_memory_resource requires RTTI for dynamic_cast |
| 14 | // UNSUPPORTED: no-rtti |
| 15 | |
| 16 | // <memory_resource> |
| 17 | |
| 18 | //----------------------------------------------------------------------------- |
| 19 | // TESTING memory_resource * get_default_resource() noexcept; |
| 20 | // memory_resource * set_default_resource(memory_resource*) noexcept; |
| 21 | // |
| 22 | // Concerns: |
| 23 | // A) 'get_default_resource()' returns a non-null memory_resource pointer. |
| 24 | // B) 'get_default_resource()' returns the value set by the last call to |
| 25 | // 'set_default_resource(...)' and 'new_delete_resource()' if no call |
| 26 | // to 'set_default_resource(...)' has occurred. |
| 27 | // C) 'set_default_resource(...)' returns the previous value of the default |
| 28 | // resource. |
| 29 | // D) 'set_default_resource(T* p)' for a non-null 'p' sets the default resource |
| 30 | // to be 'p'. |
| 31 | // E) 'set_default_resource(null)' sets the default resource to |
| 32 | // 'new_delete_resource()'. |
| 33 | // F) 'get_default_resource' and 'set_default_resource' are noexcept. |
| 34 | |
| 35 | #include <memory_resource> |
| 36 | #include <cassert> |
| 37 | |
| 38 | #include "test_std_memory_resource.h" |
| 39 | |
| 40 | using namespace std::pmr; |
| 41 | |
| 42 | int main(int, char**) { |
| 43 | TestResource R; |
| 44 | { // Test (A) and (B) |
| 45 | memory_resource* p = get_default_resource(); |
| 46 | assert(p != nullptr); |
| 47 | assert(p == new_delete_resource()); |
| 48 | assert(p == get_default_resource()); |
| 49 | } |
| 50 | { // Test (C) and (D) |
| 51 | memory_resource* expect = &R; |
| 52 | memory_resource* old = set_default_resource(expect); |
| 53 | assert(old != nullptr); |
| 54 | assert(old == new_delete_resource()); |
| 55 | |
| 56 | memory_resource* p = get_default_resource(); |
| 57 | assert(p != nullptr); |
| 58 | assert(p == expect); |
| 59 | assert(p == get_default_resource()); |
| 60 | } |
| 61 | { // Test (E) |
| 62 | memory_resource* old = set_default_resource(nullptr); |
| 63 | assert(old == &R); |
| 64 | memory_resource* p = get_default_resource(); |
| 65 | assert(p != nullptr); |
| 66 | assert(p == new_delete_resource()); |
| 67 | assert(p == get_default_resource()); |
| 68 | } |
| 69 | { // Test (F) |
| 70 | static_assert(noexcept(get_default_resource()), "get_default_resource() must be noexcept"); |
| 71 | |
| 72 | static_assert(noexcept(set_default_resource(nullptr)), "set_default_resource() must be noexcept"); |
| 73 | } |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 |