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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// TODO: Change to XFAIL once https://github.com/llvm/llvm-project/issues/40340 is fixed
// UNSUPPORTED: availability-pmr-missing
// test_memory_resource requires RTTI for dynamic_cast
// UNSUPPORTED: no-rtti
// <memory_resource>
//-----------------------------------------------------------------------------
// TESTING memory_resource * get_default_resource() noexcept;
// memory_resource * set_default_resource(memory_resource*) noexcept;
//
// Concerns:
// A) 'get_default_resource()' returns a non-null memory_resource pointer.
// B) 'get_default_resource()' returns the value set by the last call to
// 'set_default_resource(...)' and 'new_delete_resource()' if no call
// to 'set_default_resource(...)' has occurred.
// C) 'set_default_resource(...)' returns the previous value of the default
// resource.
// D) 'set_default_resource(T* p)' for a non-null 'p' sets the default resource
// to be 'p'.
// E) 'set_default_resource(null)' sets the default resource to
// 'new_delete_resource()'.
// F) 'get_default_resource' and 'set_default_resource' are noexcept.
#include <memory_resource>
#include <cassert>
#include "test_std_memory_resource.h"
using namespace std::pmr;
int main(int, char**) {
TestResource R;
{ // Test (A) and (B)
memory_resource* p = get_default_resource();
assert(p != nullptr);
assert(p == new_delete_resource());
assert(p == get_default_resource());
}
{ // Test (C) and (D)
memory_resource* expect = &R;
memory_resource* old = set_default_resource(expect);
assert(old != nullptr);
assert(old == new_delete_resource());
memory_resource* p = get_default_resource();
assert(p != nullptr);
assert(p == expect);
assert(p == get_default_resource());
}
{ // Test (E)
memory_resource* old = set_default_resource(nullptr);
assert(old == &R);
memory_resource* p = get_default_resource();
assert(p != nullptr);
assert(p == new_delete_resource());
assert(p == get_default_resource());
}
{ // Test (F)
static_assert(noexcept(get_default_resource()), "get_default_resource() must be noexcept");
static_assert(noexcept(set_default_resource(nullptr)), "set_default_resource() must be noexcept");
}
return 0;
}
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