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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // <algorithm> 10 11 // UNSUPPORTED: c++03, c++11, c++14, c++17 12 13 // template<input_iterator I, sentinel_for<I> S, weakly_incrementable O> 14 // requires indirectly_copyable<I, O> 15 // constexpr ranges::copy_result<I, O> ranges::copy(I first, S last, O result); 16 // template<input_range R, weakly_incrementable O> 17 // requires indirectly_copyable<iterator_t<R>, O> 18 // constexpr ranges::copy_result<borrowed_iterator_t<R>, O> ranges::copy(R&& r, O result); 19 20 #include <algorithm> 21 #include <array> 22 #include <cassert> 23 #include <ranges> 24 25 #include "almost_satisfies_types.h" 26 #include "test_iterators.h" 27 28 template <class In, class Out = In, class Sent = sentinel_wrapper<In>> 29 concept HasCopyIt = requires(In in, Sent sent, Out out) { std::ranges::copy(in, sent, out); }; 30 31 static_assert(HasCopyIt<int*>); 32 static_assert(!HasCopyIt<InputIteratorNotDerivedFrom>); 33 static_assert(!HasCopyIt<InputIteratorNotIndirectlyReadable>); 34 static_assert(!HasCopyIt<InputIteratorNotInputOrOutputIterator>); 35 static_assert(!HasCopyIt<int*, WeaklyIncrementableNotMovable>); 36 struct NotIndirectlyCopyable {}; 37 static_assert(!HasCopyIt<int*, NotIndirectlyCopyable*>); 38 static_assert(!HasCopyIt<int*, int*, SentinelForNotSemiregular>); 39 static_assert(!HasCopyIt<int*, int*, SentinelForNotWeaklyEqualityComparableWith>); 40 41 template <class Range, class Out> 42 concept HasCopyR = requires(Range range, Out out) { std::ranges::copy(range, out); }; 43 44 static_assert(HasCopyR<std::array<int, 10>, int*>); 45 static_assert(!HasCopyR<InputRangeNotDerivedFrom, int*>); 46 static_assert(!HasCopyR<InputRangeNotIndirectlyReadable, int*>); 47 static_assert(!HasCopyR<InputRangeNotInputOrOutputIterator, int*>); 48 static_assert(!HasCopyR<WeaklyIncrementableNotMovable, int*>); 49 static_assert(!HasCopyR<UncheckedRange<NotIndirectlyCopyable*>, int*>); 50 static_assert(!HasCopyR<InputRangeNotSentinelSemiregular, int*>); 51 static_assert(!HasCopyR<InputRangeNotSentinelEqualityComparableWith, int*>); 52 53 static_assert(std::is_same_v<std::ranges::copy_result<int, long>, std::ranges::in_out_result<int, long>>); 54 55 template <class In, class Out, class Sent = In> 56 constexpr void test_iterators() { 57 { // simple test 58 { 59 std::array in {1, 2, 3, 4}; 60 std::array<int, 4> out; 61 std::same_as<std::ranges::in_out_result<In, Out>> auto ret = 62 std::ranges::copy(In(in.data()), Sent(In(in.data() + in.size())), Out(out.data())); 63 assert(in == out); 64 assert(base(ret.in) == in.data() + in.size()); 65 assert(base(ret.out) == out.data() + out.size()); 66 } 67 { 68 std::array in {1, 2, 3, 4}; 69 std::array<int, 4> out; 70 auto range = std::ranges::subrange(In(in.data()), Sent(In(in.data() + in.size()))); 71 std::same_as<std::ranges::in_out_result<In, Out>> auto ret = std::ranges::copy(range, Out(out.data())); 72 assert(in == out); 73 assert(base(ret.in) == in.data() + in.size()); 74 assert(base(ret.out) == out.data() + out.size()); 75 } 76 } 77 78 { // check that an empty range works 79 { 80 std::array<int, 0> in; 81 std::array<int, 0> out; 82 auto ret = std::ranges::copy(In(in.data()), Sent(In(in.data() + in.size())), Out(out.data())); 83 assert(base(ret.in) == in.data()); 84 assert(base(ret.out) == out.data()); 85 } 86 { 87 std::array<int, 0> in; 88 std::array<int, 0> out; 89 auto range = std::ranges::subrange(In(in.data()), Sent(In(in.data() + in.size()))); 90 auto ret = std::ranges::copy(range, Out(out.data())); 91 assert(base(ret.in) == in.data()); 92 assert(base(ret.out) == out.data()); 93 } 94 } 95 } 96 97 template <class In, class Out> 98 constexpr void test_sentinels() { 99 test_iterators<In, Out>(); 100 test_iterators<In, Out, sized_sentinel<In>>(); 101 test_iterators<In, Out, sentinel_wrapper<In>>(); 102 } 103 104 template <class Out> 105 constexpr void test_in_iterators() { 106 test_iterators<cpp20_input_iterator<int*>, Out, sentinel_wrapper<cpp20_input_iterator<int*>>>(); 107 test_sentinels<forward_iterator<int*>, Out>(); 108 test_sentinels<bidirectional_iterator<int*>, Out>(); 109 test_sentinels<random_access_iterator<int*>, Out>(); 110 test_sentinels<contiguous_iterator<int*>, Out>(); 111 } 112 113 template <class Out> 114 constexpr void test_proxy_in_iterators() { 115 test_iterators<ProxyIterator<cpp20_input_iterator<int*>>, Out, sentinel_wrapper<ProxyIterator<cpp20_input_iterator<int*>>>>(); 116 test_iterators<ProxyIterator<forward_iterator<int*>>, Out>(); 117 test_iterators<ProxyIterator<bidirectional_iterator<int*>>, Out>(); 118 test_iterators<ProxyIterator<random_access_iterator<int*>>, Out>(); 119 test_iterators<ProxyIterator<contiguous_iterator<int*>>, Out>(); 120 } 121 122 constexpr bool test() { 123 test_in_iterators<cpp20_input_iterator<int*>>(); 124 test_in_iterators<forward_iterator<int*>>(); 125 test_in_iterators<bidirectional_iterator<int*>>(); 126 test_in_iterators<random_access_iterator<int*>>(); 127 test_in_iterators<contiguous_iterator<int*>>(); 128 129 test_proxy_in_iterators<ProxyIterator<cpp20_input_iterator<int*>>>(); 130 test_proxy_in_iterators<ProxyIterator<forward_iterator<int*>>>(); 131 test_proxy_in_iterators<ProxyIterator<bidirectional_iterator<int*>>>(); 132 test_proxy_in_iterators<ProxyIterator<random_access_iterator<int*>>>(); 133 test_proxy_in_iterators<ProxyIterator<contiguous_iterator<int*>>>(); 134 135 { // check that ranges::dangling is returned 136 std::array<int, 4> out; 137 std::same_as<std::ranges::in_out_result<std::ranges::dangling, int*>> auto ret = 138 std::ranges::copy(std::array {1, 2, 3, 4}, out.data()); 139 assert(ret.out == out.data() + 4); 140 assert((out == std::array{1, 2, 3, 4})); 141 } 142 143 { // check that an iterator is returned with a borrowing range 144 std::array in {1, 2, 3, 4}; 145 std::array<int, 4> out; 146 std::same_as<std::ranges::in_out_result<int*, int*>> auto ret = std::ranges::copy(std::views::all(in), out.data()); 147 assert(ret.in == in.data() + 4); 148 assert(ret.out == out.data() + 4); 149 assert(in == out); 150 } 151 152 { // check that every element is copied exactly once 153 struct CopyOnce { 154 bool copied = false; 155 constexpr CopyOnce() = default; 156 constexpr CopyOnce(const CopyOnce& other) = delete; 157 constexpr CopyOnce& operator=(const CopyOnce& other) { 158 assert(!other.copied); 159 copied = true; 160 return *this; 161 } 162 }; 163 { 164 std::array<CopyOnce, 4> in {}; 165 std::array<CopyOnce, 4> out {}; 166 auto ret = std::ranges::copy(in.begin(), in.end(), out.begin()); 167 assert(ret.in == in.end()); 168 assert(ret.out == out.end()); 169 assert(std::all_of(out.begin(), out.end(), [](const auto& e) { return e.copied; })); 170 } 171 { 172 std::array<CopyOnce, 4> in {}; 173 std::array<CopyOnce, 4> out {}; 174 auto ret = std::ranges::copy(in, out.begin()); 175 assert(ret.in == in.end()); 176 assert(ret.out == out.end()); 177 assert(std::all_of(out.begin(), out.end(), [](const auto& e) { return e.copied; })); 178 } 179 } 180 181 { // check that the range is copied forwards 182 struct OnlyForwardsCopyable { 183 OnlyForwardsCopyable* next = nullptr; 184 bool canCopy = false; 185 OnlyForwardsCopyable() = default; 186 constexpr OnlyForwardsCopyable& operator=(const OnlyForwardsCopyable&) { 187 assert(canCopy); 188 if (next != nullptr) 189 next->canCopy = true; 190 return *this; 191 } 192 }; 193 { 194 std::array<OnlyForwardsCopyable, 3> in {}; 195 std::array<OnlyForwardsCopyable, 3> out {}; 196 out[0].next = &out[1]; 197 out[1].next = &out[2]; 198 out[0].canCopy = true; 199 auto ret = std::ranges::copy(in.begin(), in.end(), out.begin()); 200 assert(ret.in == in.end()); 201 assert(ret.out == out.end()); 202 assert(out[0].canCopy); 203 assert(out[1].canCopy); 204 assert(out[2].canCopy); 205 } 206 { 207 std::array<OnlyForwardsCopyable, 3> in {}; 208 std::array<OnlyForwardsCopyable, 3> out {}; 209 out[0].next = &out[1]; 210 out[1].next = &out[2]; 211 out[0].canCopy = true; 212 auto ret = std::ranges::copy(in, out.begin()); 213 assert(ret.in == in.end()); 214 assert(ret.out == out.end()); 215 assert(out[0].canCopy); 216 assert(out[1].canCopy); 217 assert(out[2].canCopy); 218 } 219 } 220 221 return true; 222 } 223 224 int main(int, char**) { 225 test(); 226 static_assert(test()); 227 228 return 0; 229 } 230