1bb2328fd3
* Implement "P2441R2 `views::join_with`" (https://wg21.link/P2441R2), closes #105185 * Implement LWG4074 (https://wg21.link/LWG4074), closes #105346 * Complete implementation of "P2711R1 Making multi-param constructors of views explicit" (https://wg21.link/P2711R1), closes #105252 * Complete implementation of "P2770R0 Stashing stashing iterators for proper flattening" (https://wg21.link/P2770R0), closes #105250
110 lines
3.9 KiB
C++
110 lines
3.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// REQUIRES: std-at-least-c++23
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// <ranges>
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// template<bool OtherConst>
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// requires sentinel_for<sentinel_t<Base>, iterator_t<maybe-const<OtherConst, V>>>
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// friend constexpr bool operator==(const iterator<OtherConst>& x, const sentinel& y);
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#include <ranges>
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#include <cassert>
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#include <type_traits>
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#include <utility>
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#include <vector>
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#include "../types.h"
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#include "test_comparisons.h"
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#include "test_iterators.h"
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struct NonCrossConstComparableView : std::ranges::view_base {
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using NonConstRange = std::vector<int>;
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NonConstRange* begin();
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sentinel_wrapper<NonConstRange*> end();
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using ConstRange = BasicVectorView<int, ViewProperties{}, forward_iterator>;
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ConstRange* begin() const;
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sentinel_wrapper<ConstRange*> end() const;
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};
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static_assert(std::ranges::range<NonCrossConstComparableView>);
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static_assert(std::ranges::range<const NonCrossConstComparableView>);
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constexpr bool test() {
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using Inner = BasicVectorView<int, ViewProperties{.common = false}, cpp20_input_iterator>;
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using V = std::vector<Inner>;
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using Pattern = std::ranges::single_view<int>;
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using JWV = std::ranges::join_with_view<std::ranges::owning_view<V>, Pattern>;
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static_assert(!std::ranges::common_range<JWV>);
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using Iter = std::ranges::iterator_t<JWV>;
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using CIter = std::ranges::iterator_t<const JWV>;
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static_assert(!std::same_as<Iter, CIter>);
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using Sent = std::ranges::sentinel_t<JWV>;
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using CSent = std::ranges::sentinel_t<const JWV>;
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static_assert(!std::same_as<Sent, CSent>);
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{ // Compare iterator<Const> with sentinel<Const>
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{ // Const == true
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AssertEqualityReturnBool<CIter, CSent>();
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const JWV jwv(V{Inner{1, 2}, Inner{4}}, 3);
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assert(testEquality(std::ranges::next(jwv.begin(), 4), jwv.end(), true));
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assert(testEquality(jwv.begin(), jwv.end(), false));
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}
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{ // Const == false
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AssertEqualityReturnBool<Iter, Sent>();
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JWV jwv(V{Inner{5}, Inner{7, 8}}, 6);
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assert(testEquality(std::ranges::next(jwv.begin(), 4), jwv.end(), true));
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assert(testEquality(std::ranges::next(jwv.begin(), 2), jwv.end(), false));
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}
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}
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{ // Compare iterator<Const> with sentinel<!Const>
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{ // Const == true
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AssertEqualityReturnBool<CIter, Sent>();
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JWV jwv(V{Inner{9, 10}, Inner{12}}, 11);
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assert(testEquality(std::ranges::next(std::as_const(jwv).begin(), 4), jwv.end(), true));
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assert(testEquality(std::ranges::next(std::as_const(jwv).begin(), 2), jwv.end(), false));
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}
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{ // Const == false
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AssertEqualityReturnBool<Iter, CSent>();
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JWV jwv(V{Inner{13}, Inner{15, 16}}, 14);
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assert(testEquality(std::ranges::next(jwv.begin(), 4), std::as_const(jwv).end(), true));
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assert(testEquality(std::ranges::next(jwv.begin(), 3), std::as_const(jwv).end(), false));
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}
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}
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{ // Check invalid comparisons between iterator<Const> and sentinel<!Const>
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using JWV2 = std::ranges::join_with_view<NonCrossConstComparableView, Pattern>;
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static_assert(!std::ranges::common_range<JWV2>);
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static_assert(!weakly_equality_comparable_with<std::ranges::iterator_t<const JWV2>, std::ranges::sentinel_t<JWV2>>);
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static_assert(!weakly_equality_comparable_with<std::ranges::iterator_t<JWV2>, std::ranges::sentinel_t<const JWV2>>);
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// Those should be valid
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static_assert(weakly_equality_comparable_with<std::ranges::iterator_t<JWV2>, std::ranges::sentinel_t<JWV2>>);
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static_assert(
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weakly_equality_comparable_with<std::ranges::iterator_t<const JWV2>, std::ranges::sentinel_t<const JWV2>>);
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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