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 // UNSUPPORTED: libcpp-has-no-incomplete-ranges 11 12 // template<class R> 13 // concept forward_range; 14 15 #include <ranges> 16 17 #include "test_iterators.h" 18 #include "test_range.h" 19 20 template <template <class...> class I> 21 constexpr bool check_forward_range() { 22 constexpr bool result = std::ranges::forward_range<test_range<I> >; 23 static_assert(std::ranges::forward_range<test_range<I> const> == result); 24 static_assert(std::ranges::forward_range<test_non_const_common_range<I> > == result); 25 static_assert(std::ranges::forward_range<test_non_const_range<I> > == result); 26 static_assert(std::ranges::forward_range<test_common_range<I> > == result); 27 static_assert(std::ranges::forward_range<test_common_range<I> const> == result); 28 static_assert(!std::ranges::forward_range<test_non_const_common_range<I> const>); 29 static_assert(!std::ranges::forward_range<test_non_const_range<I> const>); 30 return result; 31 } 32 33 static_assert(!check_forward_range<cpp17_input_iterator>()); 34 static_assert(!check_forward_range<cpp20_input_iterator>()); 35 static_assert(check_forward_range<forward_iterator>()); 36 static_assert(check_forward_range<bidirectional_iterator>()); 37 static_assert(check_forward_range<random_access_iterator>()); 38 static_assert(check_forward_range<contiguous_iterator>()); 39 40 // Test ADL-proofing. 41 struct Incomplete; 42 template<class T> struct Holder { T t; }; 43 44 static_assert(!std::ranges::forward_range<Holder<Incomplete>*>); 45 static_assert(!std::ranges::forward_range<Holder<Incomplete>*&>); 46 static_assert(!std::ranges::forward_range<Holder<Incomplete>*&&>); 47 static_assert(!std::ranges::forward_range<Holder<Incomplete>* const>); 48 static_assert(!std::ranges::forward_range<Holder<Incomplete>* const&>); 49 static_assert(!std::ranges::forward_range<Holder<Incomplete>* const&&>); 50 51 static_assert( std::ranges::forward_range<Holder<Incomplete>*[10]>); 52 static_assert( std::ranges::forward_range<Holder<Incomplete>*(&)[10]>); 53 static_assert( std::ranges::forward_range<Holder<Incomplete>*(&&)[10]>); 54 static_assert( std::ranges::forward_range<Holder<Incomplete>* const[10]>); 55 static_assert( std::ranges::forward_range<Holder<Incomplete>* const(&)[10]>); 56 static_assert( std::ranges::forward_range<Holder<Incomplete>* const(&&)[10]>); 57