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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// REQUIRES: c++experimental
// UNSUPPORTED: c++98, c++03
// <experimental/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 <experimental/memory_resource>
#include <cassert>
#include "test_memory_resource.hpp"
using namespace std::experimental::pmr;
int main() {
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");
}
}
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