| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 10 | |
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| 11 | // sentinel() = default; |
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| 12 | |
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| 13 | #include <cassert> |
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| 14 | #include <ranges> |
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| 15 | |
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| 16 | struct Sent { |
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| 17 | bool b; // deliberately uninitialised |
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| 18 | |
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| 19 | friend constexpr bool operator==(int*, const Sent& s) { return s.b; } |
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| 20 | }; |
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| 21 | |
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| 22 | struct Range : std::ranges::view_base { |
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| 23 | int* begin() const; |
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| 24 | Sent end(); |
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| 25 | }; |
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| 26 | |
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| 27 | constexpr bool test() { |
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| 28 | { |
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| 29 | using R = std::ranges::take_while_view<Range, bool (*)(int)>; |
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| 30 | using Sentinel = std::ranges::sentinel_t<R>; |
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| 31 | |
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| 32 | Sentinel s1 = {}; |
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| 33 | assert(!s1.base().b); |
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| 34 | } |
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| 35 | return true; |
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| 36 | } |
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| 37 | |
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| 38 | int main(int, char**) { |
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| 39 | test(); |
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| 40 | static_assert(test()); |
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| 41 | |
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| 42 | return 0; |
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| 43 | } |
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| 44 | |
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