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128 lines
3.9 KiB
C++
128 lines
3.9 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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// <tuple>
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// template <class... Types> class tuple;
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// tuple(tuple&& u);
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// UNSUPPORTED: c++98, c++03
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#include <tuple>
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#include <utility>
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#include <cassert>
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#include "test_macros.h"
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#include "MoveOnly.h"
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struct ConstructsWithTupleLeaf
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{
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ConstructsWithTupleLeaf() {}
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ConstructsWithTupleLeaf(ConstructsWithTupleLeaf const &) { assert(false); }
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ConstructsWithTupleLeaf(ConstructsWithTupleLeaf &&) {}
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template <class T>
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ConstructsWithTupleLeaf(T) {
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static_assert(!std::is_same<T, T>::value,
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"Constructor instantiated for type other than int");
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}
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};
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// move_only type which triggers the empty base optimization
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struct move_only_ebo {
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move_only_ebo() = default;
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move_only_ebo(move_only_ebo&&) = default;
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};
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// a move_only type which does not trigger the empty base optimization
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struct move_only_large final {
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move_only_large() : value(42) {}
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move_only_large(move_only_large&&) = default;
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int value;
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};
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template <class Elem>
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void test_sfinae() {
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using Tup = std::tuple<Elem>;
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using Alloc = std::allocator<void>;
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using Tag = std::allocator_arg_t;
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// special members
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{
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static_assert(std::is_default_constructible<Tup>::value, "");
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static_assert(std::is_move_constructible<Tup>::value, "");
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static_assert(!std::is_copy_constructible<Tup>::value, "");
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static_assert(!std::is_constructible<Tup, Tup&>::value, "");
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}
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// args constructors
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{
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static_assert(std::is_constructible<Tup, Elem&&>::value, "");
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static_assert(!std::is_constructible<Tup, Elem const&>::value, "");
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static_assert(!std::is_constructible<Tup, Elem&>::value, "");
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}
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// uses-allocator special member constructors
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{
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static_assert(std::is_constructible<Tup, Tag, Alloc>::value, "");
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static_assert(std::is_constructible<Tup, Tag, Alloc, Tup&&>::value, "");
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static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup const&>::value, "");
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static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup &>::value, "");
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}
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// uses-allocator args constructors
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{
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static_assert(std::is_constructible<Tup, Tag, Alloc, Elem&&>::value, "");
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static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem const&>::value, "");
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static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem &>::value, "");
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}
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}
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int main(int, char**)
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{
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{
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typedef std::tuple<> T;
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T t0;
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T t = std::move(t0);
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((void)t); // Prevent unused warning
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}
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{
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typedef std::tuple<MoveOnly> T;
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T t0(MoveOnly(0));
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T t = std::move(t0);
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assert(std::get<0>(t) == 0);
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}
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{
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typedef std::tuple<MoveOnly, MoveOnly> T;
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T t0(MoveOnly(0), MoveOnly(1));
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T t = std::move(t0);
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assert(std::get<0>(t) == 0);
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assert(std::get<1>(t) == 1);
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}
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{
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typedef std::tuple<MoveOnly, MoveOnly, MoveOnly> T;
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T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2));
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T t = std::move(t0);
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assert(std::get<0>(t) == 0);
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assert(std::get<1>(t) == 1);
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assert(std::get<2>(t) == 2);
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}
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// A bug in tuple caused __tuple_leaf to use its explicit converting constructor
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// as its move constructor. This tests that ConstructsWithTupleLeaf is not called
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// (w/ __tuple_leaf)
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{
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typedef std::tuple<ConstructsWithTupleLeaf> d_t;
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d_t d((ConstructsWithTupleLeaf()));
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d_t d2(static_cast<d_t &&>(d));
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}
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{
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test_sfinae<move_only_ebo>();
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test_sfinae<move_only_large>();
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}
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return 0;
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}
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