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//===----------------------------------------------------------------------===//
//
// 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++03
#include <tuple>
#include <utility>
#include <cassert>
#include "test_macros.h"
#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<int>;
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(int, char**)
{
{
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>();
}
return 0;
}
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