1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <tuple> 11 12 // template <class... Types> class tuple; 13 14 // tuple(tuple&& u); 15 16 // UNSUPPORTED: c++98, c++03 17 18 #include <tuple> 19 #include <utility> 20 #include <cassert> 21 22 #include "MoveOnly.h" 23 24 struct ConstructsWithTupleLeaf 25 { 26 ConstructsWithTupleLeaf() {} 27 28 ConstructsWithTupleLeaf(ConstructsWithTupleLeaf const &) { assert(false); } 29 ConstructsWithTupleLeaf(ConstructsWithTupleLeaf &&) {} 30 31 template <class T> 32 ConstructsWithTupleLeaf(T) { 33 static_assert(!std::is_same<T, T>::value, 34 "Constructor instantiated for type other than int"); 35 } 36 }; 37 38 // move_only type which triggers the empty base optimization 39 struct move_only_ebo { 40 move_only_ebo() = default; 41 move_only_ebo(move_only_ebo&&) = default; 42 }; 43 44 // a move_only type which does not trigger the empty base optimization 45 struct move_only_large final { 46 move_only_large() : value(42) {} 47 move_only_large(move_only_large&&) = default; 48 int value; 49 }; 50 51 template <class Elem> 52 void test_sfinae() { 53 using Tup = std::tuple<Elem>; 54 using Alloc = std::allocator<void>; 55 using Tag = std::allocator_arg_t; 56 // special members 57 { 58 static_assert(std::is_default_constructible<Tup>::value, ""); 59 static_assert(std::is_move_constructible<Tup>::value, ""); 60 static_assert(!std::is_copy_constructible<Tup>::value, ""); 61 static_assert(!std::is_constructible<Tup, Tup&>::value, ""); 62 } 63 // args constructors 64 { 65 static_assert(std::is_constructible<Tup, Elem&&>::value, ""); 66 static_assert(!std::is_constructible<Tup, Elem const&>::value, ""); 67 static_assert(!std::is_constructible<Tup, Elem&>::value, ""); 68 } 69 // uses-allocator special member constructors 70 { 71 static_assert(std::is_constructible<Tup, Tag, Alloc>::value, ""); 72 static_assert(std::is_constructible<Tup, Tag, Alloc, Tup&&>::value, ""); 73 static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup const&>::value, ""); 74 static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup &>::value, ""); 75 } 76 // uses-allocator args constructors 77 { 78 static_assert(std::is_constructible<Tup, Tag, Alloc, Elem&&>::value, ""); 79 static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem const&>::value, ""); 80 static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem &>::value, ""); 81 } 82 } 83 84 int main() 85 { 86 { 87 typedef std::tuple<> T; 88 T t0; 89 T t = std::move(t0); 90 ((void)t); // Prevent unused warning 91 } 92 { 93 typedef std::tuple<MoveOnly> T; 94 T t0(MoveOnly(0)); 95 T t = std::move(t0); 96 assert(std::get<0>(t) == 0); 97 } 98 { 99 typedef std::tuple<MoveOnly, MoveOnly> T; 100 T t0(MoveOnly(0), MoveOnly(1)); 101 T t = std::move(t0); 102 assert(std::get<0>(t) == 0); 103 assert(std::get<1>(t) == 1); 104 } 105 { 106 typedef std::tuple<MoveOnly, MoveOnly, MoveOnly> T; 107 T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2)); 108 T t = std::move(t0); 109 assert(std::get<0>(t) == 0); 110 assert(std::get<1>(t) == 1); 111 assert(std::get<2>(t) == 2); 112 } 113 // A bug in tuple caused __tuple_leaf to use its explicit converting constructor 114 // as its move constructor. This tests that ConstructsWithTupleLeaf is not called 115 // (w/ __tuple_leaf) 116 { 117 typedef std::tuple<ConstructsWithTupleLeaf> d_t; 118 d_t d((ConstructsWithTupleLeaf())); 119 d_t d2(static_cast<d_t &&>(d)); 120 } 121 { 122 test_sfinae<move_only_ebo>(); 123 test_sfinae<move_only_large>(); 124 } 125 } 126
