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authorLiam <byteslice@airmail.cc>2022-11-21 17:31:18 +0100
committerLiam <byteslice@airmail.cc>2022-11-23 04:22:28 +0100
commit9737615948d431cf56826f3c109bbc0fef7b4d10 (patch)
tree9d4742bf8f2b64b9a5b30ae33b105a5e9344ab3b /src/common/polyfill_ranges.h
parentMerge pull request #9279 from liamwhite/this-would-have-never-happened-in-rust (diff)
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-rw-r--r--src/common/polyfill_ranges.h530
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diff --git a/src/common/polyfill_ranges.h b/src/common/polyfill_ranges.h
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+++ b/src/common/polyfill_ranges.h
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+// SPDX-FileCopyrightText: 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+//
+// TODO: remove this file when ranges are supported by all compilation targets
+//
+
+#pragma once
+
+#include <algorithm>
+#include <utility>
+#include <version>
+
+#ifndef __cpp_lib_ranges
+
+namespace std {
+namespace ranges {
+
+template <typename T>
+concept range = requires(T& t) {
+ begin(t);
+ end(t);
+};
+
+template <typename T>
+concept input_range = range<T>;
+
+template <typename T>
+concept output_range = range<T>;
+
+template <range R>
+using range_difference_t = ptrdiff_t;
+
+//
+// find, find_if, find_if_not
+//
+
+struct find_fn {
+ template <typename Iterator, typename T, typename Proj = std::identity>
+ constexpr Iterator operator()(Iterator first, Iterator last, const T& value,
+ Proj proj = {}) const {
+ for (; first != last; ++first) {
+ if (std::invoke(proj, *first) == value) {
+ return first;
+ }
+ }
+ return first;
+ }
+
+ template <ranges::input_range R, typename T, typename Proj = std::identity>
+ constexpr ranges::iterator_t<R> operator()(R&& r, const T& value, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), value, std::ref(proj));
+ }
+};
+
+struct find_if_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Pred>
+ constexpr Iterator operator()(Iterator first, Iterator last, Pred pred, Proj proj = {}) const {
+ for (; first != last; ++first) {
+ if (std::invoke(pred, std::invoke(proj, *first))) {
+ return first;
+ }
+ }
+ return first;
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity, typename Pred>
+ constexpr ranges::iterator_t<R> operator()(R&& r, Pred pred, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj));
+ }
+};
+
+struct find_if_not_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Pred>
+ constexpr Iterator operator()(Iterator first, Iterator last, Pred pred, Proj proj = {}) const {
+ for (; first != last; ++first) {
+ if (!std::invoke(pred, std::invoke(proj, *first))) {
+ return first;
+ }
+ }
+ return first;
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity, typename Pred>
+ constexpr ranges::iterator_t<R> operator()(R&& r, Pred pred, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj));
+ }
+};
+
+inline constexpr find_fn find;
+inline constexpr find_if_fn find_if;
+inline constexpr find_if_not_fn find_if_not;
+
+//
+// any_of, all_of, none_of
+//
+
+struct all_of_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Pred>
+ constexpr bool operator()(Iterator first, Iterator last, Pred pred, Proj proj = {}) const {
+ return ranges::find_if_not(first, last, std::ref(pred), std::ref(proj)) == last;
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity, typename Pred>
+ constexpr bool operator()(R&& r, Pred pred, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj));
+ }
+};
+
+struct any_of_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Pred>
+ constexpr bool operator()(Iterator first, Iterator last, Pred pred, Proj proj = {}) const {
+ return ranges::find_if(first, last, std::ref(pred), std::ref(proj)) != last;
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity, typename Pred>
+ constexpr bool operator()(R&& r, Pred pred, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj));
+ }
+};
+
+struct none_of_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Pred>
+ constexpr bool operator()(Iterator first, Iterator last, Pred pred, Proj proj = {}) const {
+ return ranges::find_if(first, last, std::ref(pred), std::ref(proj)) == last;
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity, typename Pred>
+ constexpr bool operator()(R&& r, Pred pred, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj));
+ }
+};
+
+inline constexpr any_of_fn any_of;
+inline constexpr all_of_fn all_of;
+inline constexpr none_of_fn none_of;
+
+//
+// count, count_if
+//
+
+struct count_fn {
+ template <typename Iterator, typename T, typename Proj = std::identity>
+ constexpr ptrdiff_t operator()(Iterator first, Iterator last, const T& value,
+ Proj proj = {}) const {
+ ptrdiff_t counter = 0;
+ for (; first != last; ++first)
+ if (std::invoke(proj, *first) == value)
+ ++counter;
+ return counter;
+ }
+
+ template <ranges::input_range R, typename T, typename Proj = std::identity>
+ constexpr ptrdiff_t operator()(R&& r, const T& value, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), value, std::ref(proj));
+ }
+};
+
+struct count_if_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Pred>
+ constexpr ptrdiff_t operator()(Iterator first, Iterator last, Pred pred, Proj proj = {}) const {
+ ptrdiff_t counter = 0;
+ for (; first != last; ++first)
+ if (std::invoke(pred, std::invoke(proj, *first)))
+ ++counter;
+ return counter;
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity, typename Pred>
+ constexpr ptrdiff_t operator()(R&& r, Pred pred, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj));
+ }
+};
+
+inline constexpr count_fn count;
+inline constexpr count_if_fn count_if;
+
+//
+// transform
+//
+
+struct transform_fn {
+ template <typename InputIterator, typename OutputIterator, typename F,
+ typename Proj = std::identity>
+ constexpr void operator()(InputIterator first1, InputIterator last1, OutputIterator result,
+ F op, Proj proj = {}) const {
+ for (; first1 != last1; ++first1, (void)++result) {
+ *result = std::invoke(op, std::invoke(proj, *first1));
+ }
+ }
+
+ template <ranges::input_range R, typename OutputIterator, typename F,
+ typename Proj = std::identity>
+ constexpr void operator()(R&& r, OutputIterator result, F op, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), result, std::ref(op), std::ref(proj));
+ }
+};
+
+inline constexpr transform_fn transform;
+
+//
+// sort
+//
+
+struct sort_fn {
+ template <typename Iterator, typename Comp = ranges::less, typename Proj = std::identity>
+ constexpr void operator()(Iterator first, Iterator last, Comp comp = {}, Proj proj = {}) const {
+ if (first == last)
+ return;
+
+ Iterator last_iter = ranges::next(first, last);
+ std::sort(first, last_iter,
+ [&](auto& lhs, auto& rhs) { return comp(proj(lhs), proj(rhs)); });
+ }
+
+ template <ranges::input_range R, typename Comp = ranges::less, typename Proj = std::identity>
+ constexpr void operator()(R&& r, Comp comp = {}, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::move(comp), std::move(proj));
+ }
+};
+
+inline constexpr sort_fn sort;
+
+//
+// fill
+//
+
+struct fill_fn {
+ template <typename T, typename OutputIterator>
+ constexpr OutputIterator operator()(OutputIterator first, OutputIterator last,
+ const T& value) const {
+ while (first != last) {
+ *first++ = value;
+ }
+
+ return first;
+ }
+
+ template <typename T, ranges::output_range R>
+ constexpr ranges::iterator_t<R> operator()(R&& r, const T& value) const {
+ return operator()(ranges::begin(r), ranges::end(r), value);
+ }
+};
+
+inline constexpr fill_fn fill;
+
+//
+// for_each
+//
+
+struct for_each_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Fun>
+ constexpr void operator()(Iterator first, Iterator last, Fun f, Proj proj = {}) const {
+ for (; first != last; ++first) {
+ std::invoke(f, std::invoke(proj, *first));
+ }
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity, typename Fun>
+ constexpr void operator()(R&& r, Fun f, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::move(f), std::ref(proj));
+ }
+};
+
+inline constexpr for_each_fn for_each;
+
+//
+// min_element, max_element
+//
+
+struct min_element_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Comp = ranges::less>
+ constexpr Iterator operator()(Iterator first, Iterator last, Comp comp = {},
+ Proj proj = {}) const {
+ if (first == last) {
+ return last;
+ }
+
+ auto smallest = first;
+ ++first;
+ for (; first != last; ++first) {
+ if (!std::invoke(comp, std::invoke(proj, *smallest), std::invoke(proj, *first))) {
+ smallest = first;
+ }
+ }
+ return smallest;
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity, typename Comp = ranges::less>
+ constexpr ranges::iterator_t<R> operator()(R&& r, Comp comp = {}, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::ref(comp), std::ref(proj));
+ }
+};
+
+struct max_element_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Comp = ranges::less>
+ constexpr Iterator operator()(Iterator first, Iterator last, Comp comp = {},
+ Proj proj = {}) const {
+ if (first == last) {
+ return last;
+ }
+
+ auto largest = first;
+ ++first;
+ for (; first != last; ++first) {
+ if (std::invoke(comp, std::invoke(proj, *largest), std::invoke(proj, *first))) {
+ largest = first;
+ }
+ }
+ return largest;
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity, typename Comp = ranges::less>
+ constexpr ranges::iterator_t<R> operator()(R&& r, Comp comp = {}, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::ref(comp), std::ref(proj));
+ }
+};
+
+inline constexpr min_element_fn min_element;
+inline constexpr max_element_fn max_element;
+
+//
+// replace, replace_if
+//
+
+struct replace_fn {
+ template <typename Iterator, typename T1, typename T2, typename Proj = std::identity>
+ constexpr Iterator operator()(Iterator first, Iterator last, const T1& old_value,
+ const T2& new_value, Proj proj = {}) const {
+ for (; first != last; ++first) {
+ if (old_value == std::invoke(proj, *first)) {
+ *first = new_value;
+ }
+ }
+ return first;
+ }
+
+ template <ranges::input_range R, typename T1, typename T2, typename Proj = std::identity>
+ constexpr ranges::iterator_t<R> operator()(R&& r, const T1& old_value, const T2& new_value,
+ Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), old_value, new_value, std::move(proj));
+ }
+};
+
+struct replace_if_fn {
+ template <typename Iterator, typename T, typename Proj = std::identity, typename Pred>
+ constexpr Iterator operator()(Iterator first, Iterator last, Pred pred, const T& new_value,
+ Proj proj = {}) const {
+ for (; first != last; ++first) {
+ if (!!std::invoke(pred, std::invoke(proj, *first))) {
+ *first = new_value;
+ }
+ }
+ return std::move(first);
+ }
+
+ template <ranges::input_range R, typename T, typename Proj = std::identity, typename Pred>
+ constexpr ranges::iterator_t<R> operator()(R&& r, Pred pred, const T& new_value,
+ Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::move(pred), new_value,
+ std::move(proj));
+ }
+};
+
+inline constexpr replace_fn replace;
+inline constexpr replace_if_fn replace_if;
+
+//
+// copy, copy_if
+//
+
+struct copy_fn {
+ template <typename InputIterator, typename OutputIterator>
+ constexpr void operator()(InputIterator first, InputIterator last,
+ OutputIterator result) const {
+ for (; first != last; ++first, (void)++result) {
+ *result = *first;
+ }
+ }
+
+ template <ranges::input_range R, typename OutputIterator>
+ constexpr void operator()(R&& r, OutputIterator result) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::move(result));
+ }
+};
+
+struct copy_if_fn {
+ template <typename InputIterator, typename OutputIterator, typename Proj = std::identity,
+ typename Pred>
+ constexpr void operator()(InputIterator first, InputIterator last, OutputIterator result,
+ Pred pred, Proj proj = {}) const {
+ for (; first != last; ++first) {
+ if (std::invoke(pred, std::invoke(proj, *first))) {
+ *result = *first;
+ ++result;
+ }
+ }
+ }
+
+ template <ranges::input_range R, typename OutputIterator, typename Proj = std::identity,
+ typename Pred>
+ constexpr void operator()(R&& r, OutputIterator result, Pred pred, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::move(result), std::ref(pred),
+ std::ref(proj));
+ }
+};
+
+inline constexpr copy_fn copy;
+inline constexpr copy_if_fn copy_if;
+
+//
+// generate
+//
+
+struct generate_fn {
+ template <typename Iterator, typename F>
+ constexpr Iterator operator()(Iterator first, Iterator last, F gen) const {
+ for (; first != last; *first = std::invoke(gen), ++first)
+ ;
+ return first;
+ }
+
+ template <typename R, std::copy_constructible F>
+ requires std::invocable<F&> && ranges::output_range<R>
+ constexpr ranges::iterator_t<R> operator()(R&& r, F gen) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::move(gen));
+ }
+};
+
+inline constexpr generate_fn generate;
+
+//
+// lower_bound, upper_bound
+//
+
+struct lower_bound_fn {
+ template <typename Iterator, typename T, typename Proj = std::identity,
+ typename Comp = ranges::less>
+ constexpr Iterator operator()(Iterator first, Iterator last, const T& value, Comp comp = {},
+ Proj proj = {}) const {
+ Iterator it;
+ std::ptrdiff_t _count, _step;
+ _count = std::distance(first, last);
+
+ while (_count > 0) {
+ it = first;
+ _step = _count / 2;
+ ranges::advance(it, _step, last);
+ if (comp(std::invoke(proj, *it), value)) {
+ first = ++it;
+ _count -= _step + 1;
+ } else {
+ _count = _step;
+ }
+ }
+ return first;
+ }
+
+ template <ranges::input_range R, typename T, typename Proj = std::identity,
+ typename Comp = ranges::less>
+ constexpr ranges::iterator_t<R> operator()(R&& r, const T& value, Comp comp = {},
+ Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), value, std::ref(comp), std::ref(proj));
+ }
+};
+
+struct upper_bound_fn {
+ template <typename Iterator, typename T, typename Proj = std::identity,
+ typename Comp = ranges::less>
+ constexpr Iterator operator()(Iterator first, Iterator last, const T& value, Comp comp = {},
+ Proj proj = {}) const {
+ Iterator it;
+ std::ptrdiff_t _count, _step;
+ _count = std::distance(first, last);
+
+ while (_count > 0) {
+ it = first;
+ _step = _count / 2;
+ ranges::advance(it, _step, last);
+ if (!comp(value, std::invoke(proj, *it))) {
+ first = ++it;
+ _count -= _step + 1;
+ } else {
+ _count = _step;
+ }
+ }
+ return first;
+ }
+
+ template <ranges::input_range R, typename T, typename Proj = std::identity,
+ typename Comp = ranges::less>
+ constexpr ranges::iterator_t<R> operator()(R&& r, const T& value, Comp comp = {},
+ Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), value, std::ref(comp), std::ref(proj));
+ }
+};
+
+inline constexpr lower_bound_fn lower_bound;
+inline constexpr upper_bound_fn upper_bound;
+
+//
+// adjacent_find
+//
+
+struct adjacent_find_fn {
+ template <typename Iterator, typename Proj = std::identity, typename Pred = ranges::equal_to>
+ constexpr Iterator operator()(Iterator first, Iterator last, Pred pred = {},
+ Proj proj = {}) const {
+ if (first == last)
+ return first;
+ auto _next = ranges::next(first);
+ for (; _next != last; ++_next, ++first)
+ if (std::invoke(pred, std::invoke(proj, *first), std::invoke(proj, *_next)))
+ return first;
+ return _next;
+ }
+
+ template <ranges::input_range R, typename Proj = std::identity,
+ typename Pred = ranges::equal_to>
+ constexpr ranges::iterator_t<R> operator()(R&& r, Pred pred = {}, Proj proj = {}) const {
+ return operator()(ranges::begin(r), ranges::end(r), std::ref(pred), std::ref(proj));
+ }
+};
+
+inline constexpr adjacent_find_fn adjacent_find;
+
+} // namespace ranges
+} // namespace std
+
+#endif