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
19struct Range : std::ranges::view_base {
20 constexpr explicit Range(int* b, int* e) : begin_(b), end_(e) {}
21 constexpr int* begin() const { return begin_; }
22 constexpr int* end() const { return end_; }
23
24private:
25 int* begin_;
26 int* end_;
27};
28
29struct F {
30 constexpr int operator()(int i) const { return i + 100; }
31};
32
33// SFINAE tests.
34
35#if TEST_STD_VER >= 23
36
37static_assert(!test_convertible<std::ranges::transform_view<Range, F>, Range, F>(),
38 "This constructor must be explicit");
39
40#else
41
42static_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
47constexpr 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
63int main(int, char**) {
64 test();
65 static_assert(test());
66
67 return 0;
68}
69

source code of libcxx/test/std/ranges/range.adaptors/range.transform/ctor.view_function.pass.cpp