| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| // UNSUPPORTED: libcpp-no-concepts |
| |
| // constexpr common_iterator() requires default_initializable<I> = default; |
| // constexpr common_iterator(I i); |
| // constexpr common_iterator(S s); |
| // template<class I2, class S2> |
| // requires convertible_to<const I2&, I> && convertible_to<const S2&, S> |
| // constexpr common_iterator(const common_iterator<I2, S2>& x); |
| |
| #include <iterator> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "types.h" |
| |
| template<class I, class S> |
| concept ValidCommonIterator = requires { |
| typename std::common_iterator<I, S>; |
| }; |
| |
| template<class I, class I2> |
| concept ConvCtorEnabled = requires(std::common_iterator<I2, sentinel_type<int*>> ci) { |
| std::common_iterator<I, sentinel_type<int*>>(ci); |
| }; |
| |
| void test() { |
| int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8}; |
| |
| static_assert( std::is_default_constructible_v<std::common_iterator<int*, sentinel_type<int*>>>); |
| static_assert(!std::is_default_constructible_v<std::common_iterator<non_default_constructible_iterator<int*>, sentinel_type<int*>>>); |
| |
| // Not copyable: |
| static_assert(!ValidCommonIterator<cpp20_input_iterator<int*>, sentinel_type<int*>>); |
| // Same iter and sent: |
| static_assert(!ValidCommonIterator<cpp17_input_iterator<int*>, cpp17_input_iterator<int*>>); |
| |
| { |
| auto iter1 = cpp17_input_iterator<int*>(buffer); |
| auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1); |
| auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8}); |
| |
| assert(*iter1 == 1); |
| assert(*commonIter1 == 1); |
| assert(commonIter1 != commonSent1); |
| } |
| { |
| auto iter1 = forward_iterator<int*>(buffer); |
| auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1); |
| auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8}); |
| |
| assert(*iter1 == 1); |
| assert(*commonIter1 == 1); |
| assert(commonIter1 != commonSent1); |
| } |
| { |
| auto iter1 = random_access_iterator<int*>(buffer); |
| auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1); |
| auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8}); |
| |
| assert(*iter1 == 1); |
| assert(*commonIter1 == 1); |
| assert(commonIter1 != commonSent1); |
| } |
| |
| // Conversion constructor: |
| { |
| convertible_iterator<int*> conv{buffer}; |
| auto commonIter1 = std::common_iterator<convertible_iterator<int*>, sentinel_type<int*>>(conv); |
| auto commonIter2 = std::common_iterator<forward_iterator<int*>, sentinel_type<int*>>(commonIter1); |
| assert(*commonIter2 == 1); |
| |
| static_assert( ConvCtorEnabled<forward_iterator<int*>, convertible_iterator<int*>>); |
| static_assert(!ConvCtorEnabled<forward_iterator<int*>, random_access_iterator<int*>>); |
| } |
| } |
| |
| int main(int, char**) { |
| test(); |
| |
| return 0; |
| } |