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 random_access_range;
14 
15 #include <ranges>
16 
17 #include "test_range.h"
18 #include "test_iterators.h"
19 
20 namespace ranges = std::ranges;
21 
22 template <template <class...> class I>
23 constexpr bool check_range() {
24   constexpr bool result = ranges::random_access_range<test_range<I> >;
25   static_assert(ranges::random_access_range<test_range<I> const> == result);
26   static_assert(ranges::random_access_range<test_non_const_common_range<I> > == result);
27   static_assert(ranges::random_access_range<test_non_const_range<I> > == result);
28   static_assert(ranges::random_access_range<test_common_range<I> > == result);
29   static_assert(ranges::random_access_range<test_common_range<I> const> == result);
30   static_assert(!ranges::random_access_range<test_non_const_common_range<I> const>);
31   static_assert(!ranges::random_access_range<test_non_const_range<I> const>);
32   return result;
33 }
34 
35 static_assert(!check_range<cpp20_input_iterator>());
36 static_assert(!check_range<forward_iterator>());
37 static_assert(!check_range<bidirectional_iterator>());
38 static_assert(check_range<random_access_iterator>());
39 static_assert(check_range<contiguous_iterator>());
40 
41 // Test ADL-proofing.
42 struct Incomplete;
43 template<class T> struct Holder { T t; };
44 
45 static_assert(!std::ranges::random_access_range<Holder<Incomplete>*>);
46 static_assert(!std::ranges::random_access_range<Holder<Incomplete>*&>);
47 static_assert(!std::ranges::random_access_range<Holder<Incomplete>*&&>);
48 static_assert(!std::ranges::random_access_range<Holder<Incomplete>* const>);
49 static_assert(!std::ranges::random_access_range<Holder<Incomplete>* const&>);
50 static_assert(!std::ranges::random_access_range<Holder<Incomplete>* const&&>);
51 
52 static_assert( std::ranges::random_access_range<Holder<Incomplete>*[10]>);
53 static_assert( std::ranges::random_access_range<Holder<Incomplete>*(&)[10]>);
54 static_assert( std::ranges::random_access_range<Holder<Incomplete>*(&&)[10]>);
55 static_assert( std::ranges::random_access_range<Holder<Incomplete>* const[10]>);
56 static_assert( std::ranges::random_access_range<Holder<Incomplete>* const(&)[10]>);
57 static_assert( std::ranges::random_access_range<Holder<Incomplete>* const(&&)[10]>);
58