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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 outer-iterator& x, const outer-iterator& y)
// requires forward_range<Base>;
//
// friend constexpr bool operator==(const outer-iterator& x, default_sentinel_t);
#include <ranges>
#include <concepts>
#include <string_view>
#include "../types.h"
template <class Iter>
concept CanCallEquals = requires(const Iter& i) {
i == i;
i != i;
};
constexpr bool test() {
// Forward range supports both overloads of `operator==`.
{
// outer-iterator == outer-iterator
{
SplitViewForward v("abc def", " ");
auto b = v.begin(), e = v.end();
assert(b == b);
assert(!(b != b));
assert(e == e);
assert(!(e != e));
assert(!(b == e));
assert(b != e);
}
// outer-iterator == default_sentinel
{
SplitViewForward v("abc def", " ");
auto b = v.begin(), e = v.end();
assert(!(b == std::default_sentinel));
assert(b != std::default_sentinel);
assert(e == std::default_sentinel);
assert(!(e != std::default_sentinel));
}
// Default-constructed `outer-iterator`s compare equal.
{
OuterIterForward i1, i2;
assert(i1 == i2);
assert(!(i1 != i2));
}
}
// Input range only supports comparing an `outer-iterator` to the default sentinel.
{
using namespace std::string_view_literals;
SplitViewInput v("abc def"sv, ' ');
auto b = v.begin();
std::same_as<std::default_sentinel_t> decltype(auto) e = v.end();
static_assert(!CanCallEquals<decltype(b)>);
assert(!(b == std::default_sentinel));
assert(b != std::default_sentinel);
assert(!(b == e));
assert(b != e);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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