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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
// friend constexpr bool operator==(const iterator& x, const iterator& y);
// requires ref-is-glvalue && forward_range<Base> &&
// equality_comparable<iterator_t<range_reference_t<Base>>>;
#include <cassert>
#include <ranges>
#include "../types.h"
constexpr bool test() {
int buffer[4][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};
{
std::ranges::join_view jv(buffer);
auto iter1 = jv.begin();
auto iter2 = jv.begin();
assert(iter1 == iter2);
iter1++;
assert(iter1 != iter2);
iter2++;
assert(iter1 == iter2);
assert(jv.begin() == std::as_const(jv).begin());
}
{
// !ref-is-glvalue
BidiCommonInner inners[2] = {buffer[0], buffer[1]};
InnerRValue<BidiCommonOuter<BidiCommonInner>> outer{inners};
std::ranges::join_view jv(outer);
auto iter = jv.begin();
static_assert(!std::equality_comparable<decltype(iter)>);
}
{
// !forward_range<Base>
using Inner = BufferView<int*>;
using Outer = BufferView<cpp20_input_iterator<Inner*>, sentinel_wrapper<cpp20_input_iterator<Inner*>>>;
static_assert(!std::equality_comparable<std::ranges::iterator_t<Outer>>);
Inner inners[2] = {buffer[0], buffer[1]};
std::ranges::join_view jv(Outer{inners});
auto iter = jv.begin();
static_assert(!std::equality_comparable<decltype(iter)>);
}
{
// !equality_comparable<iterator_t<range_reference_t<Base>>>;
using Inner = BufferView<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>;
Inner inners[1] = {buffer[0]};
std::ranges::join_view jv{inners};
auto iter = jv.begin();
static_assert(!std::equality_comparable<decltype(iter)>);
auto const_iter = std::as_const(jv).begin();
static_assert(!std::equality_comparable<decltype(const_iter)>);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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