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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
//
//===----------------------------------------------------------------------===//
// REQUIRES: std-at-least-c++23
// <ranges>
// template<bool OtherConst>
// requires sentinel_for<sentinel_t<Base>, iterator_t<maybe-const<OtherConst, V>>>
// friend constexpr bool operator==(const iterator<OtherConst>& x, const sentinel& y);
#include <ranges>
#include <cassert>
#include <type_traits>
#include <utility>
#include <vector>
#include "../types.h"
#include "test_comparisons.h"
#include "test_iterators.h"
struct NonCrossConstComparableView : std::ranges::view_base {
using NonConstRange = std::vector<int>;
NonConstRange* begin();
sentinel_wrapper<NonConstRange*> end();
using ConstRange = BasicVectorView<int, ViewProperties{}, forward_iterator>;
ConstRange* begin() const;
sentinel_wrapper<ConstRange*> end() const;
};
static_assert(std::ranges::range<NonCrossConstComparableView>);
static_assert(std::ranges::range<const NonCrossConstComparableView>);
constexpr bool test() {
using Inner = BasicVectorView<int, ViewProperties{.common = false}, cpp20_input_iterator>;
using V = std::vector<Inner>;
using Pattern = std::ranges::single_view<int>;
using JWV = std::ranges::join_with_view<std::ranges::owning_view<V>, Pattern>;
static_assert(!std::ranges::common_range<JWV>);
using Iter = std::ranges::iterator_t<JWV>;
using CIter = std::ranges::iterator_t<const JWV>;
static_assert(!std::same_as<Iter, CIter>);
using Sent = std::ranges::sentinel_t<JWV>;
using CSent = std::ranges::sentinel_t<const JWV>;
static_assert(!std::same_as<Sent, CSent>);
{ // Compare iterator<Const> with sentinel<Const>
{ // Const == true
AssertEqualityReturnBool<CIter, CSent>();
const JWV jwv(V{Inner{1, 2}, Inner{4}}, 3);
assert(testEquality(std::ranges::next(jwv.begin(), 4), jwv.end(), true));
assert(testEquality(jwv.begin(), jwv.end(), false));
}
{ // Const == false
AssertEqualityReturnBool<Iter, Sent>();
JWV jwv(V{Inner{5}, Inner{7, 8}}, 6);
assert(testEquality(std::ranges::next(jwv.begin(), 4), jwv.end(), true));
assert(testEquality(std::ranges::next(jwv.begin(), 2), jwv.end(), false));
}
}
{ // Compare iterator<Const> with sentinel<!Const>
{ // Const == true
AssertEqualityReturnBool<CIter, Sent>();
JWV jwv(V{Inner{9, 10}, Inner{12}}, 11);
assert(testEquality(std::ranges::next(std::as_const(jwv).begin(), 4), jwv.end(), true));
assert(testEquality(std::ranges::next(std::as_const(jwv).begin(), 2), jwv.end(), false));
}
{ // Const == false
AssertEqualityReturnBool<Iter, CSent>();
JWV jwv(V{Inner{13}, Inner{15, 16}}, 14);
assert(testEquality(std::ranges::next(jwv.begin(), 4), std::as_const(jwv).end(), true));
assert(testEquality(std::ranges::next(jwv.begin(), 3), std::as_const(jwv).end(), false));
}
}
{ // Check invalid comparisons between iterator<Const> and sentinel<!Const>
using JWV2 = std::ranges::join_with_view<NonCrossConstComparableView, Pattern>;
static_assert(!std::ranges::common_range<JWV2>);
static_assert(!weakly_equality_comparable_with<std::ranges::iterator_t<const JWV2>, std::ranges::sentinel_t<JWV2>>);
static_assert(!weakly_equality_comparable_with<std::ranges::iterator_t<JWV2>, std::ranges::sentinel_t<const JWV2>>);
// Those should be valid
static_assert(weakly_equality_comparable_with<std::ranges::iterator_t<JWV2>, std::ranges::sentinel_t<JWV2>>);
static_assert(
weakly_equality_comparable_with<std::ranges::iterator_t<const JWV2>, std::ranges::sentinel_t<const JWV2>>);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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