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