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 //----------------------------------------------------------------------------- 16 // TESTING memory_resource * get_default_resource() noexcept; 17 // memory_resource * set_default_resource(memory_resource*) noexcept; 18 // 19 // Concerns: 20 // A) 'get_default_resource()' returns a non-null memory_resource pointer. 21 // B) 'get_default_resource()' returns the value set by the last call to 22 // 'set_default_resource(...)' and 'new_delete_resource()' if no call 23 // to 'set_default_resource(...)' has occurred. 24 // C) 'set_default_resource(...)' returns the previous value of the default 25 // resource. 26 // D) 'set_default_resource(T* p)' for a non-null 'p' sets the default resource 27 // to be 'p'. 28 // E) 'set_default_resource(null)' sets the default resource to 29 // 'new_delete_resource()'. 30 // F) 'get_default_resource' and 'set_default_resource' are noexcept. 31 32 33 #include <experimental/memory_resource> 34 #include <cassert> 35 36 #include "test_memory_resource.hpp" 37 38 using namespace std::experimental::pmr; 39 40 int main() { 41 TestResource R; 42 { // Test (A) and (B) 43 memory_resource* p = get_default_resource(); 44 assert(p != nullptr); 45 assert(p == new_delete_resource()); 46 assert(p == get_default_resource()); 47 } 48 { // Test (C) and (D) 49 memory_resource *expect = &R; 50 memory_resource *old = set_default_resource(expect); 51 assert(old != nullptr); 52 assert(old == new_delete_resource()); 53 54 memory_resource *p = get_default_resource(); 55 assert(p != nullptr); 56 assert(p == expect); 57 assert(p == get_default_resource()); 58 } 59 { // Test (E) 60 memory_resource* old = set_default_resource(nullptr); 61 assert(old == &R); 62 memory_resource* p = get_default_resource(); 63 assert(p != nullptr); 64 assert(p == new_delete_resource()); 65 assert(p == get_default_resource()); 66 } 67 { // Test (F) 68 static_assert(noexcept(get_default_resource()), 69 "get_default_resource() must be noexcept"); 70 71 static_assert(noexcept(set_default_resource(nullptr)), 72 "set_default_resource() must be noexcept"); 73 } 74 } 75
