forked from OSchip/llvm-project
89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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;
|
|
}
|