| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // template<class R> |
| // concept common_range; |
| |
| #include <ranges> |
| |
| #include "test_iterators.h" |
| |
| template<class It> struct Common { It begin() const; It end() const; }; |
| template<class It> struct NonCommon { It begin() const; sentinel_wrapper<It> end() const; }; |
| template<class It, class Sent> struct Range { It begin() const; Sent end() const; }; |
| |
| static_assert(!std::ranges::common_range<Common<cpp17_input_iterator<int*>>>); // not a sentinel for itself |
| static_assert(!std::ranges::common_range<Common<cpp20_input_iterator<int*>>>); // not a sentinel for itself |
| static_assert( std::ranges::common_range<Common<forward_iterator<int*>>>); |
| static_assert( std::ranges::common_range<Common<bidirectional_iterator<int*>>>); |
| static_assert( std::ranges::common_range<Common<random_access_iterator<int*>>>); |
| static_assert( std::ranges::common_range<Common<contiguous_iterator<int*>>>); |
| static_assert( std::ranges::common_range<Common<int*>>); |
| |
| static_assert(!std::ranges::common_range<NonCommon<cpp17_input_iterator<int*>>>); |
| static_assert(!std::ranges::common_range<NonCommon<cpp20_input_iterator<int*>>>); |
| static_assert(!std::ranges::common_range<NonCommon<forward_iterator<int*>>>); |
| static_assert(!std::ranges::common_range<NonCommon<bidirectional_iterator<int*>>>); |
| static_assert(!std::ranges::common_range<NonCommon<random_access_iterator<int*>>>); |
| static_assert(!std::ranges::common_range<NonCommon<contiguous_iterator<int*>>>); |
| static_assert(!std::ranges::common_range<NonCommon<int*>>); |
| |
| // Test when begin() and end() only differ by their constness. |
| static_assert(!std::ranges::common_range<Range<int*, int const*>>); |
| |
| // Simple test with a sized_sentinel. |
| static_assert(!std::ranges::common_range<Range<int*, sized_sentinel<int*>>>); |
| |
| // Make sure cv-qualification doesn't impact the concept when begin() and end() have matching qualifiers. |
| static_assert( std::ranges::common_range<Common<forward_iterator<int*>> const>); |
| static_assert(!std::ranges::common_range<NonCommon<forward_iterator<int*>> const>); |
| |
| // Test with a range that's a common_range only when const-qualified. |
| struct Range1 { |
| int* begin(); |
| int const* begin() const; |
| int const* end() const; |
| }; |
| static_assert(!std::ranges::common_range<Range1>); |
| static_assert( std::ranges::common_range<Range1 const>); |
| |
| // Test with a range that's a common_range only when not const-qualified. |
| struct Range2 { |
| int* begin() const; |
| int* end(); |
| int const* end() const; |
| }; |
| static_assert( std::ranges::common_range<Range2>); |
| static_assert(!std::ranges::common_range<Range2 const>); |
| |
| // Test ADL-proofing. |
| struct Incomplete; |
| template<class T> struct Holder { T t; }; |
| |
| static_assert(!std::ranges::common_range<Holder<Incomplete>*>); |
| static_assert(!std::ranges::common_range<Holder<Incomplete>*&>); |
| static_assert(!std::ranges::common_range<Holder<Incomplete>*&&>); |
| static_assert(!std::ranges::common_range<Holder<Incomplete>* const>); |
| static_assert(!std::ranges::common_range<Holder<Incomplete>* const&>); |
| static_assert(!std::ranges::common_range<Holder<Incomplete>* const&&>); |
| |
| static_assert( std::ranges::common_range<Holder<Incomplete>*[10]>); |
| static_assert( std::ranges::common_range<Holder<Incomplete>*(&)[10]>); |
| static_assert( std::ranges::common_range<Holder<Incomplete>*(&&)[10]>); |
| static_assert( std::ranges::common_range<Holder<Incomplete>* const[10]>); |
| static_assert( std::ranges::common_range<Holder<Incomplete>* const(&)[10]>); |
| static_assert( std::ranges::common_range<Holder<Incomplete>* const(&&)[10]>); |