129 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <tuple>10 11// template <class... Types> class tuple;12 13// tuple(tuple&& u);14 15// UNSUPPORTED: c++0316 17#include <tuple>18#include <utility>19#include <cassert>20#include <memory>21 22#include "test_macros.h"23#include "MoveOnly.h"24 25struct ConstructsWithTupleLeaf26{27 ConstructsWithTupleLeaf() {}28 29 ConstructsWithTupleLeaf(ConstructsWithTupleLeaf const &) { assert(false); }30 ConstructsWithTupleLeaf(ConstructsWithTupleLeaf &&) {}31 32 template <class T>33 ConstructsWithTupleLeaf(T) {34 static_assert(!std::is_same<T, T>::value,35 "Constructor instantiated for type other than int");36 }37};38 39// move_only type which triggers the empty base optimization40struct move_only_ebo {41 move_only_ebo() = default;42 move_only_ebo(move_only_ebo&&) = default;43};44 45// a move_only type which does not trigger the empty base optimization46struct move_only_large final {47 move_only_large() : value(42) {}48 move_only_large(move_only_large&&) = default;49 int value;50};51 52template <class Elem>53void test_sfinae() {54 using Tup = std::tuple<Elem>;55 using Alloc = std::allocator<int>;56 using Tag = std::allocator_arg_t;57 // special members58 {59 static_assert(std::is_default_constructible<Tup>::value, "");60 static_assert(std::is_move_constructible<Tup>::value, "");61 static_assert(!std::is_copy_constructible<Tup>::value, "");62 static_assert(!std::is_constructible<Tup, Tup&>::value, "");63 }64 // args constructors65 {66 static_assert(std::is_constructible<Tup, Elem&&>::value, "");67 static_assert(!std::is_constructible<Tup, Elem const&>::value, "");68 static_assert(!std::is_constructible<Tup, Elem&>::value, "");69 }70 // uses-allocator special member constructors71 {72 static_assert(std::is_constructible<Tup, Tag, Alloc>::value, "");73 static_assert(std::is_constructible<Tup, Tag, Alloc, Tup&&>::value, "");74 static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup const&>::value, "");75 static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup &>::value, "");76 }77 // uses-allocator args constructors78 {79 static_assert(std::is_constructible<Tup, Tag, Alloc, Elem&&>::value, "");80 static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem const&>::value, "");81 static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem &>::value, "");82 }83}84 85int main(int, char**)86{87 {88 typedef std::tuple<> T;89 T t0;90 T t = std::move(t0);91 ((void)t); // Prevent unused warning92 }93 {94 typedef std::tuple<MoveOnly> T;95 T t0(MoveOnly(0));96 T t = std::move(t0);97 assert(std::get<0>(t) == 0);98 }99 {100 typedef std::tuple<MoveOnly, MoveOnly> T;101 T t0(MoveOnly(0), MoveOnly(1));102 T t = std::move(t0);103 assert(std::get<0>(t) == 0);104 assert(std::get<1>(t) == 1);105 }106 {107 typedef std::tuple<MoveOnly, MoveOnly, MoveOnly> T;108 T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2));109 T t = std::move(t0);110 assert(std::get<0>(t) == 0);111 assert(std::get<1>(t) == 1);112 assert(std::get<2>(t) == 2);113 }114 // A bug in tuple caused __tuple_leaf to use its explicit converting constructor115 // as its move constructor. This tests that ConstructsWithTupleLeaf is not called116 // (w/ __tuple_leaf)117 {118 typedef std::tuple<ConstructsWithTupleLeaf> d_t;119 d_t d((ConstructsWithTupleLeaf()));120 d_t d2(static_cast<d_t &&>(d));121 }122 {123 test_sfinae<move_only_ebo>();124 test_sfinae<move_only_large>();125 }126 127 return 0;128}129