62 lines
1.9 KiB
C++
62 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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//
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// template <class T>
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// struct unwrap_ref_decay;
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//
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// template <class T>
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// using unwrap_ref_decay_t = typename unwrap_ref_decay<T>::type;
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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#include <functional>
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#include <type_traits>
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#include "test_macros.h"
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template <typename T, typename Result>
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void check() {
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static_assert(std::is_same_v<typename std::unwrap_ref_decay<T>::type, Result>);
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static_assert(std::is_same_v<typename std::unwrap_ref_decay<T>::type, std::unwrap_ref_decay_t<T>>);
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}
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struct T { };
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int main(int, char**) {
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check<T, T>();
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check<T&, T>();
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check<T const, T>();
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check<T const&, T>();
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check<T*, T*>();
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check<T const*, T const*>();
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check<T[3], T*>();
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check<T const [3], T const*>();
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check<T (), T (*)()>();
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check<T (int) const, T (int) const>();
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check<T (int) &, T (int) &>();
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check<T (int) &&, T (int) &&>();
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check<std::reference_wrapper<T>, T&>();
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check<std::reference_wrapper<T>&, T&>();
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check<std::reference_wrapper<T const>, T const&>();
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check<std::reference_wrapper<T const>&, T const&>();
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check<std::reference_wrapper<T*>, T*&>();
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check<std::reference_wrapper<T*>&, T*&>();
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check<std::reference_wrapper<T const*>, T const*&>();
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check<std::reference_wrapper<T const*>&, T const*&>();
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check<std::reference_wrapper<T[3]>, T (&)[3]>();
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check<std::reference_wrapper<T[3]>&, T (&)[3]>();
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check<std::reference_wrapper<T ()>, T (&)()>();
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check<std::reference_wrapper<T ()>&, T (&)()>();
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return 0;
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}
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