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 // constexpr transform_view(View, F); // explicit since C++23
12
13 #include <cassert>
14 #include <ranges>
15
16 #include "test_convertible.h"
17 #include "test_macros.h"
18
19 struct Range : std::ranges::view_base {
RangeRange20 constexpr explicit Range(int* b, int* e) : begin_(b), end_(e) {}
beginRange21 constexpr int* begin() const { return begin_; }
endRange22 constexpr int* end() const { return end_; }
23
24 private:
25 int* begin_;
26 int* end_;
27 };
28
29 struct F {
operator ()F30 constexpr int operator()(int i) const { return i + 100; }
31 };
32
33 // SFINAE tests.
34
35 #if TEST_STD_VER >= 23
36
37 static_assert(!test_convertible<std::ranges::transform_view<Range, F>, Range, F>(),
38 "This constructor must be explicit");
39
40 #else
41
42 static_assert( test_convertible<std::ranges::transform_view<Range, F>, Range, F>(),
43 "This constructor must not be explicit");
44
45 #endif // TEST_STD_VER >= 23
46
test()47 constexpr bool test() {
48 int buff[] = {1, 2, 3, 4, 5, 6, 7, 8};
49
50 {
51 Range range(buff, buff + 8);
52 F f;
53 std::ranges::transform_view<Range, F> view(range, f);
54 assert(view[0] == 101);
55 assert(view[1] == 102);
56 // ...
57 assert(view[7] == 108);
58 }
59
60 return true;
61 }
62
main(int,char **)63 int main(int, char**) {
64 test();
65 static_assert(test());
66
67 return 0;
68 }
69