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d766c527c7
Common: Use feature macros for better compatibility Common/Contains.h: fix linting issue Common/Contains.h: Add C++23 TODO Common/Contains.h: Fix comment lint issue.
72 lines
2.9 KiB
C++
72 lines
2.9 KiB
C++
// Copyright 2025 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <algorithm>
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#include <iterator>
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#include <version>
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namespace Common
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{
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#if defined(__cpp_lib_ranges_contains) && __cpp_lib_ranges_contains >= 202202L
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// Use the standard library functions if available (C++23)
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inline constexpr auto& Contains = std::ranges::contains;
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inline constexpr auto& ContainsSubrange = std::ranges::contains_subrange;
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#else
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// TODO C++23: This old implementation likely isn't needed once migrated to C++23. Remove them or
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// this file itself. Ad hoc implementations for C++20
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struct ContainsFn
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{
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template <std::input_iterator I, std::sentinel_for<I> S, class T, class Proj = std::identity>
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requires std::indirect_binary_predicate<std::ranges::equal_to, std::projected<I, Proj>, const T*>
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constexpr bool operator()(I first, S last, const T& value, Proj proj = {}) const
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{
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return std::ranges::find(std::move(first), last, value, std::move(proj)) != last;
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}
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template <std::ranges::input_range R, class T, class Proj = std::identity>
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requires std::indirect_binary_predicate<
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std::ranges::equal_to, std::projected<std::ranges::iterator_t<R>, Proj>, const T*>
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constexpr bool operator()(R&& r, const T& value, Proj proj = {}) const
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{
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return (*this)(std::ranges::begin(r), std::ranges::end(r), value, std::move(proj));
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}
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};
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struct ContainsSubrangeFn
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{
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template <std::forward_iterator I1, std::sentinel_for<I1> S1, std::forward_iterator I2,
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std::sentinel_for<I2> S2, class Pred = std::ranges::equal_to,
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class Proj1 = std::identity, class Proj2 = std::identity>
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requires std::indirectly_comparable<I1, I2, Pred, Proj1, Proj2>
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constexpr bool operator()(I1 first1, S1 last1, I2 first2, S2 last2, Pred pred = {},
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Proj1 proj1 = {}, Proj2 proj2 = {}) const
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{
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return !std::ranges::search(std::move(first1), std::move(last1), std::move(first2),
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std::move(last2), std::move(pred), std::move(proj1),
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std::move(proj2))
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.empty();
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}
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template <std::ranges::forward_range R1, std::ranges::forward_range R2,
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class Pred = std::ranges::equal_to, class Proj1 = std::identity,
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class Proj2 = std::identity>
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requires std::indirectly_comparable<std::ranges::iterator_t<R1>, std::ranges::iterator_t<R2>,
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Pred, Proj1, Proj2>
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constexpr bool operator()(R1&& r1, R2&& r2, Pred pred = {}, Proj1 proj1 = {},
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Proj2 proj2 = {}) const
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{
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return (*this)(std::ranges::begin(r1), std::ranges::end(r1), std::ranges::begin(r2),
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std::ranges::end(r2), std::move(pred), std::move(proj1), std::move(proj2));
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}
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};
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inline constexpr ContainsFn Contains{};
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inline constexpr ContainsSubrangeFn ContainsSubrange{};
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#endif
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} // namespace Common
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