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// transform_view::<iterator>::operator{<,>,<=,>=,==,!=,<=>}
12
13#include <ranges>
14#include <compare>
15
16#include "test_macros.h"
17#include "test_iterators.h"
18#include "../types.h"
19
20constexpr bool test() {
21 {
22 // Test a new-school iterator with operator<=>; the transform iterator should also have operator<=>.
23 using It = three_way_contiguous_iterator<int*>;
24 static_assert(std::three_way_comparable<It>);
25 using R = std::ranges::transform_view<std::ranges::subrange<It>, PlusOne>;
26 static_assert(std::three_way_comparable<std::ranges::iterator_t<R>>);
27
28 int a[] = {1,2,3};
29 std::same_as<R> auto r = std::ranges::subrange<It>(It(a), It(a+3)) | std::views::transform(PlusOne());
30 auto iter1 = r.begin();
31 auto iter2 = iter1 + 1;
32
33 assert(!(iter1 < iter1)); assert(iter1 < iter2); assert(!(iter2 < iter1));
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 == iter2);
38 assert(!(iter1 != iter1)); assert(iter1 != iter2); assert(!(iter2 != iter2));
39
40 assert((iter1 <=> iter2) == std::strong_ordering::less);
41 assert((iter1 <=> iter1) == std::strong_ordering::equal);
42 assert((iter2 <=> iter1) == std::strong_ordering::greater);
43 }
44
45 {
46 // Test an old-school iterator with no operator<=>; the transform iterator shouldn't have operator<=> either.
47 using It = random_access_iterator<int*>;
48 static_assert(!std::three_way_comparable<It>);
49 using R = std::ranges::transform_view<std::ranges::subrange<It>, PlusOne>;
50 static_assert(!std::three_way_comparable<std::ranges::iterator_t<R>>);
51
52 int a[] = {1,2,3};
53 std::same_as<R> auto r = std::ranges::subrange<It>(It(a), It(a+3)) | std::views::transform(PlusOne());
54 auto iter1 = r.begin();
55 auto iter2 = iter1 + 1;
56
57 assert(!(iter1 < iter1)); assert(iter1 < iter2); assert(!(iter2 < iter1));
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 == iter2);
62 assert(!(iter1 != iter1)); assert(iter1 != iter2); assert(!(iter2 != iter2));
63 }
64
65 return true;
66}
67
68int main(int, char**) {
69 test();
70 static_assert(test());
71
72 return 0;
73}
74

source code of libcxx/test/std/ranges/range.adaptors/range.transform/iterator/compare.pass.cpp