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-no-concepts
11 // UNSUPPORTED: gcc-10
12 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
13 
14 // class std::ranges::subrange;
15 
16 #include <ranges>
17 
18 #include <cassert>
19 #include "test_macros.h"
20 #include "test_iterators.h"
21 
22 template<std::ranges::subrange_kind K, class... Args>
23 concept ValidSubrangeKind = requires { typename std::ranges::subrange<Args..., K>; };
24 
25 template<class... Args>
26 concept ValidSubrange = requires { typename std::ranges::subrange<Args...>; };
27 
28 static_assert( ValidSubrange<forward_iterator<int*>>);
29 static_assert( ValidSubrange<forward_iterator<int*>, forward_iterator<int*>>);
30 static_assert( ValidSubrangeKind<std::ranges::subrange_kind::unsized, forward_iterator<int*>, forward_iterator<int*>>);
31 static_assert( ValidSubrangeKind<std::ranges::subrange_kind::sized, forward_iterator<int*>, forward_iterator<int*>>);
32 // Wrong sentinel type.
33 static_assert(!ValidSubrange<forward_iterator<int*>, int*>);
34 static_assert( ValidSubrange<int*>);
35 static_assert( ValidSubrange<int*, int*>);
36 // Must be sized.
37 static_assert(!ValidSubrangeKind<std::ranges::subrange_kind::unsized, int*, int*>);
38 static_assert( ValidSubrangeKind<std::ranges::subrange_kind::sized, int*, int*>);
39 // Wrong sentinel type.
40 static_assert(!ValidSubrange<int*, forward_iterator<int*>>);
41 // Not an iterator.
42 static_assert(!ValidSubrange<int>);
43