forked from mirror/libcxx
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <functional>
|
|
//
|
|
// template <class T>
|
|
// struct unwrap_ref_decay;
|
|
//
|
|
// template <class T>
|
|
// using unwrap_ref_decay_t = typename unwrap_ref_decay<T>::type;
|
|
|
|
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
|
|
|
|
#include <functional>
|
|
#include <type_traits>
|
|
|
|
|
|
template <typename T, typename Result>
|
|
void check() {
|
|
static_assert(std::is_same_v<typename std::unwrap_ref_decay<T>::type, Result>);
|
|
static_assert(std::is_same_v<typename std::unwrap_ref_decay<T>::type, std::unwrap_ref_decay_t<T>>);
|
|
}
|
|
|
|
struct T { };
|
|
|
|
int main() {
|
|
check<T, T>();
|
|
check<T&, T>();
|
|
check<T const, T>();
|
|
check<T const&, T>();
|
|
check<T*, T*>();
|
|
check<T const*, T const*>();
|
|
check<T[3], T*>();
|
|
check<T const [3], T const*>();
|
|
check<T (), T (*)()>();
|
|
check<T (int) const, T (int) const>();
|
|
check<T (int) &, T (int) &>();
|
|
check<T (int) &&, T (int) &&>();
|
|
|
|
check<std::reference_wrapper<T>, T&>();
|
|
check<std::reference_wrapper<T>&, T&>();
|
|
check<std::reference_wrapper<T const>, T const&>();
|
|
check<std::reference_wrapper<T const>&, T const&>();
|
|
check<std::reference_wrapper<T*>, T*&>();
|
|
check<std::reference_wrapper<T*>&, T*&>();
|
|
check<std::reference_wrapper<T const*>, T const*&>();
|
|
check<std::reference_wrapper<T const*>&, T const*&>();
|
|
check<std::reference_wrapper<T[3]>, T (&)[3]>();
|
|
check<std::reference_wrapper<T[3]>&, T (&)[3]>();
|
|
check<std::reference_wrapper<T ()>, T (&)()>();
|
|
check<std::reference_wrapper<T ()>&, T (&)()>();
|
|
}
|