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, c++20
10
11 // Some basic examples of how zip_view might be used in the wild. This is a general
12 // collection of sample algorithms and functions that try to mock general usage of
13 // this view.
14
15 #include <ranges>
16
17 #include <array>
18 #include <cassert>
19 #include <tuple>
20 #include <vector>
21 #include <string>
22
main(int,char **)23 int main(int, char**) {
24 {
25 std::ranges::zip_view v{
26 std::array{1, 2},
27 std::vector{4, 5, 6},
28 std::array{7},
29 };
30 assert(std::ranges::size(v) == 1);
31 assert(*v.begin() == std::make_tuple(1, 4, 7));
32 }
33 {
34 using namespace std::string_literals;
35 std::vector v{1, 2, 3, 4};
36 std::array a{"abc"s, "def"s, "gh"s};
37 auto view = std::views::zip(v, a);
38 auto it = view.begin();
39 assert(&(std::get<0>(*it)) == &(v[0]));
40 assert(&(std::get<1>(*it)) == &(a[0]));
41
42 ++it;
43 assert(&(std::get<0>(*it)) == &(v[1]));
44 assert(&(std::get<1>(*it)) == &(a[1]));
45
46 ++it;
47 assert(&(std::get<0>(*it)) == &(v[2]));
48 assert(&(std::get<1>(*it)) == &(a[2]));
49
50 ++it;
51 assert(it == view.end());
52 }
53
54 return 0;
55 }
56