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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
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: gcc-10
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// constexpr auto begin()
// requires (!(simple-view<V> &&
// random_access_range<const V> && sized_range<const V>));
// constexpr auto begin() const
// requires random_access_range<const V> && sized_range<const V>;
#include <ranges>
#include "test_macros.h"
#include "types.h"
template<class T>
concept BeginInvocable = requires(std::ranges::drop_view<T> t) { t.begin(); };
constexpr bool test() {
// random_access_range<const V> && sized_range<const V>
std::ranges::drop_view dropView1(ContiguousView(), 4);
assert(dropView1.begin() == globalBuff + 4);
// !random_access_range<const V>
std::ranges::drop_view dropView2(ForwardView(), 4);
assert(dropView2.begin().base() == globalBuff + 4);
// !random_access_range<const V>
std::ranges::drop_view dropView3(InputView(), 4);
assert(dropView3.begin().base() == globalBuff + 4);
// random_access_range<const V> && sized_range<const V>
std::ranges::drop_view dropView4(ContiguousView(), 8);
assert(dropView4.begin() == globalBuff + 8);
// random_access_range<const V> && sized_range<const V>
std::ranges::drop_view dropView5(ContiguousView(), 0);
assert(dropView5.begin() == globalBuff);
// random_access_range<const V> && sized_range<const V>
const std::ranges::drop_view dropView6(ContiguousView(), 0);
assert(dropView6.begin() == globalBuff);
// random_access_range<const V> && sized_range<const V>
std::ranges::drop_view dropView7(ContiguousView(), 10);
assert(dropView7.begin() == globalBuff + 8);
CountedView view8;
std::ranges::drop_view dropView8(view8, 5);
assert(dropView8.begin().base().base() == globalBuff + 5);
assert(dropView8.begin().stride_count() == 5);
assert(dropView8.begin().base().base() == globalBuff + 5);
assert(dropView8.begin().stride_count() == 5);
static_assert(!BeginInvocable<const ForwardView>);
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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