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 // UNSUPPORTED: c++03, c++11, c++14, c++17 10 11 // template<class R> 12 // concept common_range; 13 14 #include <ranges> 15 16 #include "test_iterators.h" 17 18 template<class It> struct Common { It begin() const; It end() const; }; 19 template<class It> struct NonCommon { It begin() const; sentinel_wrapper<It> end() const; }; 20 template<class It, class Sent> struct Range { It begin() const; Sent end() const; }; 21 22 static_assert(!std::ranges::common_range<Common<cpp17_input_iterator<int*>>>); // not a sentinel for itself 23 static_assert(!std::ranges::common_range<Common<cpp20_input_iterator<int*>>>); // not a sentinel for itself 24 static_assert( std::ranges::common_range<Common<forward_iterator<int*>>>); 25 static_assert( std::ranges::common_range<Common<bidirectional_iterator<int*>>>); 26 static_assert( std::ranges::common_range<Common<random_access_iterator<int*>>>); 27 static_assert( std::ranges::common_range<Common<contiguous_iterator<int*>>>); 28 static_assert( std::ranges::common_range<Common<int*>>); 29 30 static_assert(!std::ranges::common_range<NonCommon<cpp17_input_iterator<int*>>>); 31 static_assert(!std::ranges::common_range<NonCommon<cpp20_input_iterator<int*>>>); 32 static_assert(!std::ranges::common_range<NonCommon<forward_iterator<int*>>>); 33 static_assert(!std::ranges::common_range<NonCommon<bidirectional_iterator<int*>>>); 34 static_assert(!std::ranges::common_range<NonCommon<random_access_iterator<int*>>>); 35 static_assert(!std::ranges::common_range<NonCommon<contiguous_iterator<int*>>>); 36 static_assert(!std::ranges::common_range<NonCommon<int*>>); 37 38 // Test when begin() and end() only differ by their constness. 39 static_assert(!std::ranges::common_range<Range<int*, int const*>>); 40 41 // Simple test with a sized_sentinel. 42 static_assert(!std::ranges::common_range<Range<int*, sized_sentinel<int*>>>); 43 44 // Make sure cv-qualification doesn't impact the concept when begin() and end() have matching qualifiers. 45 static_assert( std::ranges::common_range<Common<forward_iterator<int*>> const>); 46 static_assert(!std::ranges::common_range<NonCommon<forward_iterator<int*>> const>); 47 48 // Test with a range that's a common_range only when const-qualified. 49 struct Range1 { 50 int* begin(); 51 int const* begin() const; 52 int const* end() const; 53 }; 54 static_assert(!std::ranges::common_range<Range1>); 55 static_assert( std::ranges::common_range<Range1 const>); 56 57 // Test with a range that's a common_range only when not const-qualified. 58 struct Range2 { 59 int* begin() const; 60 int* end(); 61 int const* end() const; 62 }; 63 static_assert( std::ranges::common_range<Range2>); 64 static_assert(!std::ranges::common_range<Range2 const>); 65 66 // Test ADL-proofing. 67 struct Incomplete; 68 template<class T> struct Holder { T t; }; 69 70 static_assert(!std::ranges::common_range<Holder<Incomplete>*>); 71 static_assert(!std::ranges::common_range<Holder<Incomplete>*&>); 72 static_assert(!std::ranges::common_range<Holder<Incomplete>*&&>); 73 static_assert(!std::ranges::common_range<Holder<Incomplete>* const>); 74 static_assert(!std::ranges::common_range<Holder<Incomplete>* const&>); 75 static_assert(!std::ranges::common_range<Holder<Incomplete>* const&&>); 76 77 static_assert( std::ranges::common_range<Holder<Incomplete>*[10]>); 78 static_assert( std::ranges::common_range<Holder<Incomplete>*(&)[10]>); 79 static_assert( std::ranges::common_range<Holder<Incomplete>*(&&)[10]>); 80 static_assert( std::ranges::common_range<Holder<Incomplete>* const[10]>); 81 static_assert( std::ranges::common_range<Holder<Incomplete>* const(&)[10]>); 82 static_assert( std::ranges::common_range<Holder<Incomplete>* const(&&)[10]>); 83