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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
//
//===----------------------------------------------------------------------===//
// <functional>
// reference_wrapper
// template <ObjectType T> reference_wrapper<T> ref(reference_wrapper<T> t);
// LWG 3146 "Excessive unwrapping in std::ref/cref"
#include <functional>
#include <cassert>
#include "test_macros.h"
TEST_CONSTEXPR_CXX20 bool test()
{
{
int i = 0;
std::reference_wrapper<int> ri(i);
std::reference_wrapper<std::reference_wrapper<int> > rri(ri);
auto rrj = std::ref(rri);
ASSERT_SAME_TYPE(decltype(rrj), std::reference_wrapper<std::reference_wrapper<int> >);
assert(&rrj.get() == &ri);
}
{
int i = 0;
std::reference_wrapper<int> ri(i);
std::reference_wrapper<const std::reference_wrapper<int> > rri(ri);
auto rrj = std::ref(rri);
ASSERT_SAME_TYPE(decltype(rrj), std::reference_wrapper<const std::reference_wrapper<int> >);
assert(&rrj.get() == &ri);
}
{
int i = 0;
std::reference_wrapper<int> ri(i);
std::reference_wrapper<std::reference_wrapper<int> > rri(ri);
auto rrj = std::cref(rri);
ASSERT_SAME_TYPE(decltype(rrj), std::reference_wrapper<const std::reference_wrapper<int> >);
assert(&rrj.get() == &ri);
}
{
int i = 0;
std::reference_wrapper<int> ri(i);
std::reference_wrapper<const std::reference_wrapper<int> > rri(ri);
auto rrj = std::cref(rri);
ASSERT_SAME_TYPE(decltype(rrj), std::reference_wrapper<const std::reference_wrapper<int> >);
assert(&rrj.get() == &ri);
}
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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