forked from OSchip/llvm-project
67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <functional>
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// reference_wrapper
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// template <ObjectType T> reference_wrapper<T> ref(reference_wrapper<T> t);
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// LWG 3146 "Excessive unwrapping in std::ref/cref"
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#include <functional>
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#include <cassert>
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#include "test_macros.h"
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TEST_CONSTEXPR_CXX20 bool test()
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{
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{
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int i = 0;
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std::reference_wrapper<int> ri(i);
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std::reference_wrapper<std::reference_wrapper<int> > rri(ri);
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auto rrj = std::ref(rri);
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ASSERT_SAME_TYPE(decltype(rrj), std::reference_wrapper<std::reference_wrapper<int> >);
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assert(&rrj.get() == &ri);
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}
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{
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int i = 0;
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std::reference_wrapper<int> ri(i);
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std::reference_wrapper<const std::reference_wrapper<int> > rri(ri);
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auto rrj = std::ref(rri);
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ASSERT_SAME_TYPE(decltype(rrj), std::reference_wrapper<const std::reference_wrapper<int> >);
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assert(&rrj.get() == &ri);
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}
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{
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int i = 0;
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std::reference_wrapper<int> ri(i);
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std::reference_wrapper<std::reference_wrapper<int> > rri(ri);
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auto rrj = std::cref(rri);
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ASSERT_SAME_TYPE(decltype(rrj), std::reference_wrapper<const std::reference_wrapper<int> >);
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assert(&rrj.get() == &ri);
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}
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{
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int i = 0;
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std::reference_wrapper<int> ri(i);
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std::reference_wrapper<const std::reference_wrapper<int> > rri(ri);
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auto rrj = std::cref(rri);
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ASSERT_SAME_TYPE(decltype(rrj), std::reference_wrapper<const std::reference_wrapper<int> >);
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assert(&rrj.get() == &ri);
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}
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return true;
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}
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int main(int, char**)
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{
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test();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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return 0;
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}
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