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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 begin() requires (!simple-view<V>);
// constexpr auto begin() const requires range<const V>;
#include <ranges>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#include "test_range.h"
#include "types.h"
struct NonCommonSimpleView : std::ranges::view_base {
int* begin() const;
sentinel_wrapper<int*> end() const;
std::size_t size() { return 0; } // deliberately non-const
};
static_assert(std::ranges::sized_range<NonCommonSimpleView>);
static_assert(!std::ranges::sized_range<const NonCommonSimpleView>);
constexpr bool test() {
int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
// sized_range && random_access_iterator
{
std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView(buffer), 4);
assert(tv.begin() == SizedRandomAccessView(buffer).begin());
ASSERT_SAME_TYPE(decltype(tv.begin()), RandomAccessIter);
}
{
const std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView(buffer), 4);
assert(tv.begin() == SizedRandomAccessView(buffer).begin());
ASSERT_SAME_TYPE(decltype(tv.begin()), RandomAccessIter);
}
// sized_range && !random_access_iterator
{
std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 4);
assert(tv.begin() == std::counted_iterator<ForwardIter>(ForwardIter(buffer), 4));
ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<ForwardIter>);
}
{
const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 4);
assert(tv.begin() == std::counted_iterator<ForwardIter>(ForwardIter(buffer), 4));
ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<ForwardIter>);
}
// !sized_range
{
std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 4);
assert(tv.begin() == std::counted_iterator<int*>(buffer, 4));
ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<int*>);
}
{
const std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 4);
assert(tv.begin() == std::counted_iterator<int*>(buffer, 4));
ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<int*>);
}
// __simple_view<V> && sized_range<V> && !size_range<!V>
{
std::ranges::take_view<NonCommonSimpleView> tv{};
ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<int*>);
ASSERT_SAME_TYPE(decltype(std::as_const(tv).begin()), std::counted_iterator<int*>);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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