ab61b2c9f1
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187906 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
2.0 KiB
C++
70 lines
2.0 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <utility>
|
|
|
|
// template <class T>
|
|
// typename conditional
|
|
// <
|
|
// !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value,
|
|
// const T&,
|
|
// T&&
|
|
// >::type
|
|
// move_if_noexcept(T& x);
|
|
|
|
#include <utility>
|
|
|
|
class A
|
|
{
|
|
A(const A&);
|
|
A& operator=(const A&);
|
|
public:
|
|
|
|
A() {}
|
|
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
|
|
A(A&&) {}
|
|
#endif
|
|
};
|
|
|
|
struct legacy
|
|
{
|
|
legacy() {}
|
|
legacy(const legacy&);
|
|
};
|
|
|
|
int main()
|
|
{
|
|
int i = 0;
|
|
const int ci = 0;
|
|
|
|
legacy l;
|
|
A a;
|
|
const A ca;
|
|
|
|
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
|
|
static_assert((std::is_same<decltype(std::move_if_noexcept(i)), int&&>::value), "");
|
|
static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int&&>::value), "");
|
|
static_assert((std::is_same<decltype(std::move_if_noexcept(a)), A&&>::value), "");
|
|
static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A&&>::value), "");
|
|
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
|
|
static_assert((std::is_same<decltype(std::move_if_noexcept(i)), const int>::value), "");
|
|
static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int>::value), "");
|
|
static_assert((std::is_same<decltype(std::move_if_noexcept(a)), const A>::value), "");
|
|
static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A>::value), "");
|
|
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
|
|
static_assert((std::is_same<decltype(std::move_if_noexcept(l)), const legacy&>::value), "");
|
|
|
|
#if _LIBCPP_STD_VER > 11
|
|
constexpr int i1 = 23;
|
|
constexpr int i2 = std::move_if_noexcept(i1);
|
|
static_assert(i2 == 23, "" );
|
|
#endif
|
|
|
|
}
|