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76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <utility>
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// template <class T>
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// typename conditional
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// <
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// !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value,
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// const T&,
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// T&&
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// >::type
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// move_if_noexcept(T& x);
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#include <utility>
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#include "test_macros.h"
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class A
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{
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A(const A&);
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A& operator=(const A&);
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public:
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A() {}
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#if TEST_STD_VER >= 11
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A(A&&) {}
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#endif
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};
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struct legacy
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{
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legacy() {}
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legacy(const legacy&);
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};
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int main()
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{
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int i = 0;
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const int ci = 0;
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legacy l;
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A a;
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const A ca;
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#if TEST_STD_VER >= 11
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static_assert((std::is_same<decltype(std::move_if_noexcept(i)), int&&>::value), "");
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static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int&&>::value), "");
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static_assert((std::is_same<decltype(std::move_if_noexcept(a)), A&&>::value), "");
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static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A&&>::value), "");
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static_assert((std::is_same<decltype(std::move_if_noexcept(l)), const legacy&>::value), "");
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#else // C++ < 11
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// In C++03 libc++ #define's decltype to be __decltype on clang and
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// __typeof__ for other compilers. __typeof__ does not deduce the reference
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// qualifiers and will cause this test to fail.
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static_assert((std::is_same<decltype(std::move_if_noexcept(i)), const int&>::value), "");
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static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int&>::value), "");
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static_assert((std::is_same<decltype(std::move_if_noexcept(a)), const A&>::value), "");
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static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A&>::value), "");
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static_assert((std::is_same<decltype(std::move_if_noexcept(l)), const legacy&>::value), "");
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#endif
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#if TEST_STD_VER > 11
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constexpr int i1 = 23;
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constexpr int i2 = std::move_if_noexcept(i1);
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static_assert(i2 == 23, "" );
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#endif
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}
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