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 random_access_range;
13 
14 #include <ranges>
15 
16 #include "test_range.h"
17 #include "test_iterators.h"
18 
19 namespace ranges = std::ranges;
20 
21 template <template <class...> class I>
check_range()22 constexpr bool check_range() {
23   constexpr bool result = ranges::random_access_range<test_range<I> >;
24   static_assert(ranges::random_access_range<test_range<I> const> == result);
25   static_assert(ranges::random_access_range<test_non_const_common_range<I> > == result);
26   static_assert(ranges::random_access_range<test_non_const_range<I> > == result);
27   static_assert(ranges::random_access_range<test_common_range<I> > == result);
28   static_assert(ranges::random_access_range<test_common_range<I> const> == result);
29   static_assert(!ranges::random_access_range<test_non_const_common_range<I> const>);
30   static_assert(!ranges::random_access_range<test_non_const_range<I> const>);
31   return result;
32 }
33 
34 static_assert(!check_range<cpp20_input_iterator>());
35 static_assert(!check_range<forward_iterator>());
36 static_assert(!check_range<bidirectional_iterator>());
37 static_assert(check_range<random_access_iterator>());
38 static_assert(check_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::random_access_range<Holder<Incomplete>*>);
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>* const>);
48 static_assert(!std::ranges::random_access_range<Holder<Incomplete>* const&>);
49 static_assert(!std::ranges::random_access_range<Holder<Incomplete>* const&&>);
50 
51 static_assert( std::ranges::random_access_range<Holder<Incomplete>*[10]>);
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>* const[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