65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// constexpr auto end();
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#include <cassert>
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#include <ranges>
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#include <type_traits>
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#include <utility>
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#include "test_iterators.h"
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struct View : std::ranges::view_base {
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int* begin() const;
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int* end() const;
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};
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// Test that end is not const
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template <class T>
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concept HasEnd = requires(T t) { t.end(); };
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struct Pred {
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constexpr bool operator()(int i) const { return i < 3; }
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};
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static_assert(HasEnd<std::ranges::drop_while_view<View, Pred>>);
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static_assert(!HasEnd<const std::ranges::drop_while_view<View, Pred>>);
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constexpr bool test() {
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// return iterator
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{
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int buffer[] = {1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1};
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std::ranges::drop_while_view dwv(buffer, Pred{});
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std::same_as<int*> decltype(auto) st = dwv.end();
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assert(st == buffer + 11);
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}
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// return sentinel
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{
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using Iter = int*;
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using Sent = sentinel_wrapper<Iter>;
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using Range = std::ranges::subrange<Iter, Sent>;
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int buffer[] = {1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1};
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Range range = {buffer, Sent{buffer + 11}};
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std::ranges::drop_while_view dwv(range, Pred{});
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std::same_as<Sent> decltype(auto) st = dwv.end();
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assert(base(st) == buffer + 11);
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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