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 W operator[](difference_type n) const
12// requires advanceable<W>;
13
14#include <ranges>
15#include <cassert>
16
17#include "test_macros.h"
18#include "../types.h"
19
20template<class T>
21constexpr void testType() {
22 {
23 std::ranges::iota_view<T> io(T(0));
24 auto iter = io.begin();
25 for (int i = 0; i < 100; ++i)
26 assert(iter[i] == T(i));
27 }
28 {
29 std::ranges::iota_view<T> io(T(10));
30 auto iter = io.begin();
31 for (int i = 0; i < 100; ++i)
32 assert(iter[i] == T(i + 10));
33 }
34 {
35 const std::ranges::iota_view<T> io(T(0));
36 auto iter = io.begin();
37 for (int i = 0; i < 100; ++i)
38 assert(iter[i] == T(i));
39 }
40 {
41 const std::ranges::iota_view<T> io(T(10));
42 auto iter = io.begin();
43 for (int i = 0; i < 100; ++i)
44 assert(iter[i] == T(i + 10));
45 }
46}
47
48constexpr bool test() {
49 testType<SomeInt>();
50 testType<signed long>();
51 testType<unsigned long>();
52 testType<int>();
53 testType<unsigned>();
54 testType<short>();
55 testType<unsigned short>();
56
57 return true;
58}
59
60int main(int, char**) {
61 test();
62 static_assert(test());
63
64 return 0;
65}
66

source code of libcxx/test/std/ranges/range.factories/range.iota.view/iterator/subscript.pass.cpp