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 // transform_view::<iterator>::operator{<,>,<=,>=,==,!=,<=>}
13
14 #include <ranges>
15 #include <compare>
16
17 #include "test_macros.h"
18 #include "test_iterators.h"
19 #include "../types.h"
20
test()21 constexpr bool test() {
22 {
23 // Test a new-school iterator with operator<=>; the transform iterator should also have operator<=>.
24 using It = three_way_contiguous_iterator<int*>;
25 static_assert(std::three_way_comparable<It>);
26 using R = std::ranges::transform_view<std::ranges::subrange<It>, PlusOne>;
27 static_assert(std::three_way_comparable<std::ranges::iterator_t<R>>);
28
29 int a[] = {1,2,3};
30 std::same_as<R> auto r = std::ranges::subrange<It>(It(a), It(a+3)) | std::views::transform(PlusOne());
31 auto iter1 = r.begin();
32 auto iter2 = iter1 + 1;
33
34 assert(!(iter1 < iter1)); assert(iter1 < iter2); assert(!(iter2 < iter1));
35 assert(iter1 <= iter1); assert(iter1 <= iter2); assert(!(iter2 <= iter1));
36 assert(!(iter1 > iter1)); assert(!(iter1 > iter2)); assert(iter2 > iter1);
37 assert(iter1 >= iter1); assert(!(iter1 >= iter2)); assert(iter2 >= iter1);
38 assert(iter1 == iter1); assert(!(iter1 == iter2)); assert(iter2 == iter2);
39 assert(!(iter1 != iter1)); assert(iter1 != iter2); assert(!(iter2 != iter2));
40
41 assert((iter1 <=> iter2) == std::strong_ordering::less);
42 assert((iter1 <=> iter1) == std::strong_ordering::equal);
43 assert((iter2 <=> iter1) == std::strong_ordering::greater);
44 }
45
46 {
47 // Test an old-school iterator with no operator<=>; the transform iterator shouldn't have operator<=> either.
48 using It = random_access_iterator<int*>;
49 static_assert(!std::three_way_comparable<It>);
50 using R = std::ranges::transform_view<std::ranges::subrange<It>, PlusOne>;
51 static_assert(!std::three_way_comparable<std::ranges::iterator_t<R>>);
52
53 int a[] = {1,2,3};
54 std::same_as<R> auto r = std::ranges::subrange<It>(It(a), It(a+3)) | std::views::transform(PlusOne());
55 auto iter1 = r.begin();
56 auto iter2 = iter1 + 1;
57
58 assert(!(iter1 < iter1)); assert(iter1 < iter2); assert(!(iter2 < iter1));
59 assert(iter1 <= iter1); assert(iter1 <= iter2); assert(!(iter2 <= iter1));
60 assert(!(iter1 > iter1)); assert(!(iter1 > iter2)); assert(iter2 > iter1);
61 assert(iter1 >= iter1); assert(!(iter1 >= iter2)); assert(iter2 >= iter1);
62 assert(iter1 == iter1); assert(!(iter1 == iter2)); assert(iter2 == iter2);
63 assert(!(iter1 != iter1)); assert(iter1 != iter2); assert(!(iter2 != iter2));
64 }
65
66 return true;
67 }
68
main(int,char **)69 int main(int, char**) {
70 test();
71 static_assert(test());
72
73 return 0;
74 }
75