065dc485bd
This patch implements https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2443r1.html (`views::chunk_by`). Reviewed By: #libc, var-const Differential Revision: https://reviews.llvm.org/D144767
71 lines
1.8 KiB
C++
71 lines
1.8 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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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
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// <ranges>
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// template <class Range, class Pred>
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// chunk_by_view(Range&&, Pred) -> chunk_by_view<views::all_t<Range>, Pred>;
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#include <ranges>
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#include <cassert>
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#include <type_traits>
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#include "test_iterators.h"
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struct View : std::ranges::view_base {
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View() = default;
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forward_iterator<int*> begin() const;
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sentinel_wrapper<forward_iterator<int*>> end() const;
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};
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static_assert(std::ranges::view<View>);
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// A range that is not a view
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struct Range {
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Range() = default;
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forward_iterator<int*> begin() const;
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sentinel_wrapper<forward_iterator<int*>> end() const;
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};
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static_assert(std::ranges::range<Range>);
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static_assert(!std::ranges::view<Range>);
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struct Pred {
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constexpr bool operator()(int x, int y) const { return x <= y; }
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};
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constexpr bool test() {
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{
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View v;
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Pred pred;
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std::ranges::chunk_by_view view(v, pred);
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static_assert(std::is_same_v<decltype(view), std::ranges::chunk_by_view<View, Pred>>);
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}
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{
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Range r;
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Pred pred;
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std::ranges::chunk_by_view view(r, pred);
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static_assert(std::is_same_v<decltype(view), std::ranges::chunk_by_view<std::ranges::ref_view<Range>, Pred>>);
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}
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{
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Pred pred;
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std::ranges::chunk_by_view view(Range{}, pred);
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static_assert(std::is_same_v<decltype(view), std::ranges::chunk_by_view<std::ranges::owning_view<Range>, Pred>>);
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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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