mirror of
https://github.com/llvm-mirror/libcxx.git
synced 2025-10-23 10:07:41 +08:00
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
125 lines
3.8 KiB
C++
125 lines
3.8 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <tuple>
|
|
|
|
// template <class... Types> class tuple;
|
|
|
|
// tuple(tuple&& u);
|
|
|
|
// UNSUPPORTED: c++98, c++03
|
|
|
|
#include <tuple>
|
|
#include <utility>
|
|
#include <cassert>
|
|
|
|
#include "MoveOnly.h"
|
|
|
|
struct ConstructsWithTupleLeaf
|
|
{
|
|
ConstructsWithTupleLeaf() {}
|
|
|
|
ConstructsWithTupleLeaf(ConstructsWithTupleLeaf const &) { assert(false); }
|
|
ConstructsWithTupleLeaf(ConstructsWithTupleLeaf &&) {}
|
|
|
|
template <class T>
|
|
ConstructsWithTupleLeaf(T) {
|
|
static_assert(!std::is_same<T, T>::value,
|
|
"Constructor instantiated for type other than int");
|
|
}
|
|
};
|
|
|
|
// move_only type which triggers the empty base optimization
|
|
struct move_only_ebo {
|
|
move_only_ebo() = default;
|
|
move_only_ebo(move_only_ebo&&) = default;
|
|
};
|
|
|
|
// a move_only type which does not trigger the empty base optimization
|
|
struct move_only_large final {
|
|
move_only_large() : value(42) {}
|
|
move_only_large(move_only_large&&) = default;
|
|
int value;
|
|
};
|
|
|
|
template <class Elem>
|
|
void test_sfinae() {
|
|
using Tup = std::tuple<Elem>;
|
|
using Alloc = std::allocator<void>;
|
|
using Tag = std::allocator_arg_t;
|
|
// special members
|
|
{
|
|
static_assert(std::is_default_constructible<Tup>::value, "");
|
|
static_assert(std::is_move_constructible<Tup>::value, "");
|
|
static_assert(!std::is_copy_constructible<Tup>::value, "");
|
|
static_assert(!std::is_constructible<Tup, Tup&>::value, "");
|
|
}
|
|
// args constructors
|
|
{
|
|
static_assert(std::is_constructible<Tup, Elem&&>::value, "");
|
|
static_assert(!std::is_constructible<Tup, Elem const&>::value, "");
|
|
static_assert(!std::is_constructible<Tup, Elem&>::value, "");
|
|
}
|
|
// uses-allocator special member constructors
|
|
{
|
|
static_assert(std::is_constructible<Tup, Tag, Alloc>::value, "");
|
|
static_assert(std::is_constructible<Tup, Tag, Alloc, Tup&&>::value, "");
|
|
static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup const&>::value, "");
|
|
static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup &>::value, "");
|
|
}
|
|
// uses-allocator args constructors
|
|
{
|
|
static_assert(std::is_constructible<Tup, Tag, Alloc, Elem&&>::value, "");
|
|
static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem const&>::value, "");
|
|
static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem &>::value, "");
|
|
}
|
|
}
|
|
|
|
int main()
|
|
{
|
|
{
|
|
typedef std::tuple<> T;
|
|
T t0;
|
|
T t = std::move(t0);
|
|
((void)t); // Prevent unused warning
|
|
}
|
|
{
|
|
typedef std::tuple<MoveOnly> T;
|
|
T t0(MoveOnly(0));
|
|
T t = std::move(t0);
|
|
assert(std::get<0>(t) == 0);
|
|
}
|
|
{
|
|
typedef std::tuple<MoveOnly, MoveOnly> T;
|
|
T t0(MoveOnly(0), MoveOnly(1));
|
|
T t = std::move(t0);
|
|
assert(std::get<0>(t) == 0);
|
|
assert(std::get<1>(t) == 1);
|
|
}
|
|
{
|
|
typedef std::tuple<MoveOnly, MoveOnly, MoveOnly> T;
|
|
T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2));
|
|
T t = std::move(t0);
|
|
assert(std::get<0>(t) == 0);
|
|
assert(std::get<1>(t) == 1);
|
|
assert(std::get<2>(t) == 2);
|
|
}
|
|
// A bug in tuple caused __tuple_leaf to use its explicit converting constructor
|
|
// as its move constructor. This tests that ConstructsWithTupleLeaf is not called
|
|
// (w/ __tuple_leaf)
|
|
{
|
|
typedef std::tuple<ConstructsWithTupleLeaf> d_t;
|
|
d_t d((ConstructsWithTupleLeaf()));
|
|
d_t d2(static_cast<d_t &&>(d));
|
|
}
|
|
{
|
|
test_sfinae<move_only_ebo>();
|
|
test_sfinae<move_only_large>();
|
|
}
|
|
}
|