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000f25a37e
These functions are key to allowing the use of rvalues and variadics
in C++03 mode. Everything works the same as in C++11, except for one
tangentially related case:
struct T {
T(T &&) = default;
};
In C++11, T has a deleted copy constructor. But in C++03 Clang gives
it both a move and a copy constructor. This seems reasonable enough
given the extensions it's using.
The other changes in this patch were the minimal set required
to keep the tests passing after the move/forward change. Most notably
the removal of the `__rv<unique_ptr>` hack that was present
in an attempt to make unique_ptr move only without language support.
llvm-svn: 364063
118 lines
2.9 KiB
C++
118 lines
2.9 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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// test move
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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() TEST_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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#if TEST_STD_VER > 11
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constexpr bool test_constexpr_move() {
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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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}
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#endif
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int main(int, char**)
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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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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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ASSERT_NOEXCEPT(std::move(cx));
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static_assert(std::is_same<decltype(std::move(42)), int&&>::value, "");
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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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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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return 0;
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}
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