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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
121 lines
3.0 KiB
C++
121 lines
3.0 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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// test move
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// UNSUPPORTED: c++98, c++03
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#include <utility>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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class move_only
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{
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move_only(const move_only&);
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move_only& operator=(const move_only&);
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public:
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move_only(move_only&&) {}
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move_only& operator=(move_only&&) {return *this;}
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move_only() {}
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};
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move_only source() {return move_only();}
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const move_only csource() {return move_only();}
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void test(move_only) {}
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int x = 42;
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const int& cx = x;
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template <class QualInt>
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QualInt get() noexcept { return static_cast<QualInt>(x); }
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int copy_ctor = 0;
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int move_ctor = 0;
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struct A {
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A() {}
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A(const A&) {++copy_ctor;}
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A(A&&) {++move_ctor;}
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A& operator=(const A&) = delete;
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};
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constexpr bool test_constexpr_move() {
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#if TEST_STD_VER > 11
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int y = 42;
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const int cy = y;
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return std::move(y) == 42
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&& std::move(cy) == 42
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&& std::move(static_cast<int&&>(y)) == 42
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&& std::move(static_cast<int const&&>(y)) == 42;
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#else
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return true;
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#endif
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}
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int main()
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{
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{ // Test return type and noexcept.
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static_assert(std::is_same<decltype(std::move(x)), int&&>::value, "");
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static_assert(noexcept(std::move(x)), "");
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static_assert(std::is_same<decltype(std::move(cx)), const int&&>::value, "");
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static_assert(noexcept(std::move(cx)), "");
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static_assert(std::is_same<decltype(std::move(42)), int&&>::value, "");
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static_assert(noexcept(std::move(42)), "");
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static_assert(std::is_same<decltype(std::move(get<const int&&>())), const int&&>::value, "");
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static_assert(noexcept(std::move(get<int const&&>())), "");
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}
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{ // test copy and move semantics
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A a;
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const A ca = A();
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assert(copy_ctor == 0);
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assert(move_ctor == 0);
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A a2 = a;
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assert(copy_ctor == 1);
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assert(move_ctor == 0);
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A a3 = std::move(a);
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assert(copy_ctor == 1);
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assert(move_ctor == 1);
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A a4 = ca;
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assert(copy_ctor == 2);
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assert(move_ctor == 1);
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A a5 = std::move(ca);
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assert(copy_ctor == 3);
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assert(move_ctor == 1);
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}
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{ // test on a move only type
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move_only mo;
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test(std::move(mo));
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test(source());
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}
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#if TEST_STD_VER > 11
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{
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constexpr int y = 42;
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static_assert(std::move(y) == 42, "");
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static_assert(test_constexpr_move(), "");
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}
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#endif
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#if TEST_STD_VER == 11 && defined(_LIBCPP_VERSION)
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// Test that std::forward is constexpr in C++11. This is an extension
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// provided by both libc++ and libstdc++.
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{
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constexpr int y = 42;
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static_assert(std::move(y) == 42, "");
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}
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#endif
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}
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