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d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
321 lines
9.4 KiB
C++
321 lines
9.4 KiB
C++
/**************************************************************************/
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/* sort_array.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifndef SORT_ARRAY_H
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#define SORT_ARRAY_H
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#include "core/error/error_macros.h"
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#include "core/typedefs.h"
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#define ERR_BAD_COMPARE(cond) \
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if (unlikely(cond)) { \
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ERR_PRINT("bad comparison function; sorting will be broken"); \
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break; \
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}
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template <class T>
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struct _DefaultComparator {
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_FORCE_INLINE_ bool operator()(const T &a, const T &b) const { return (a < b); }
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};
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#ifdef DEBUG_ENABLED
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#define SORT_ARRAY_VALIDATE_ENABLED true
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#else
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#define SORT_ARRAY_VALIDATE_ENABLED false
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#endif
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template <class T, class Comparator = _DefaultComparator<T>, bool Validate = SORT_ARRAY_VALIDATE_ENABLED>
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class SortArray {
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enum {
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INTROSORT_THRESHOLD = 16
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};
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public:
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Comparator compare;
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inline const T &median_of_3(const T &a, const T &b, const T &c) const {
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if (compare(a, b)) {
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if (compare(b, c)) {
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return b;
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} else if (compare(a, c)) {
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return c;
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} else {
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return a;
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}
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} else if (compare(a, c)) {
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return a;
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} else if (compare(b, c)) {
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return c;
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} else {
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return b;
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}
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}
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inline int bitlog(int n) const {
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int k;
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for (k = 0; n != 1; n >>= 1) {
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++k;
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}
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return k;
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}
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/* Heap / Heapsort functions */
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inline void push_heap(int p_first, int p_hole_idx, int p_top_index, T p_value, T *p_array) const {
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int parent = (p_hole_idx - 1) / 2;
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while (p_hole_idx > p_top_index && compare(p_array[p_first + parent], p_value)) {
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p_array[p_first + p_hole_idx] = p_array[p_first + parent];
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p_hole_idx = parent;
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parent = (p_hole_idx - 1) / 2;
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}
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p_array[p_first + p_hole_idx] = p_value;
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}
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inline void pop_heap(int p_first, int p_last, int p_result, T p_value, T *p_array) const {
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p_array[p_result] = p_array[p_first];
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adjust_heap(p_first, 0, p_last - p_first, p_value, p_array);
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}
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inline void pop_heap(int p_first, int p_last, T *p_array) const {
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pop_heap(p_first, p_last - 1, p_last - 1, p_array[p_last - 1], p_array);
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}
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inline void adjust_heap(int p_first, int p_hole_idx, int p_len, T p_value, T *p_array) const {
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int top_index = p_hole_idx;
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int second_child = 2 * p_hole_idx + 2;
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while (second_child < p_len) {
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if (compare(p_array[p_first + second_child], p_array[p_first + (second_child - 1)])) {
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second_child--;
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}
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p_array[p_first + p_hole_idx] = p_array[p_first + second_child];
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p_hole_idx = second_child;
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second_child = 2 * (second_child + 1);
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}
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if (second_child == p_len) {
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p_array[p_first + p_hole_idx] = p_array[p_first + (second_child - 1)];
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p_hole_idx = second_child - 1;
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}
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push_heap(p_first, p_hole_idx, top_index, p_value, p_array);
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}
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inline void sort_heap(int p_first, int p_last, T *p_array) const {
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while (p_last - p_first > 1) {
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pop_heap(p_first, p_last--, p_array);
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}
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}
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inline void make_heap(int p_first, int p_last, T *p_array) const {
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if (p_last - p_first < 2) {
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return;
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}
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int len = p_last - p_first;
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int parent = (len - 2) / 2;
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while (true) {
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adjust_heap(p_first, parent, len, p_array[p_first + parent], p_array);
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if (parent == 0) {
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return;
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}
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parent--;
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}
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}
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inline void partial_sort(int p_first, int p_last, int p_middle, T *p_array) const {
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make_heap(p_first, p_middle, p_array);
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for (int i = p_middle; i < p_last; i++) {
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if (compare(p_array[i], p_array[p_first])) {
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pop_heap(p_first, p_middle, i, p_array[i], p_array);
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}
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}
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sort_heap(p_first, p_middle, p_array);
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}
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inline void partial_select(int p_first, int p_last, int p_middle, T *p_array) const {
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make_heap(p_first, p_middle, p_array);
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for (int i = p_middle; i < p_last; i++) {
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if (compare(p_array[i], p_array[p_first])) {
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pop_heap(p_first, p_middle, i, p_array[i], p_array);
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}
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}
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}
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inline int partitioner(int p_first, int p_last, T p_pivot, T *p_array) const {
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const int unmodified_first = p_first;
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const int unmodified_last = p_last;
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while (true) {
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while (compare(p_array[p_first], p_pivot)) {
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if (Validate) {
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ERR_BAD_COMPARE(p_first == unmodified_last - 1);
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}
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p_first++;
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}
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p_last--;
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while (compare(p_pivot, p_array[p_last])) {
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if (Validate) {
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ERR_BAD_COMPARE(p_last == unmodified_first);
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}
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p_last--;
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}
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if (!(p_first < p_last)) {
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return p_first;
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}
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SWAP(p_array[p_first], p_array[p_last]);
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p_first++;
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}
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}
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inline void introsort(int p_first, int p_last, T *p_array, int p_max_depth) const {
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while (p_last - p_first > INTROSORT_THRESHOLD) {
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if (p_max_depth == 0) {
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partial_sort(p_first, p_last, p_last, p_array);
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return;
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}
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p_max_depth--;
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int cut = partitioner(
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p_first,
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p_last,
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median_of_3(
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p_array[p_first],
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p_array[p_first + (p_last - p_first) / 2],
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p_array[p_last - 1]),
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p_array);
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introsort(cut, p_last, p_array, p_max_depth);
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p_last = cut;
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}
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}
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inline void introselect(int p_first, int p_nth, int p_last, T *p_array, int p_max_depth) const {
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while (p_last - p_first > 3) {
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if (p_max_depth == 0) {
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partial_select(p_first, p_nth + 1, p_last, p_array);
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SWAP(p_first, p_nth);
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return;
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}
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p_max_depth--;
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int cut = partitioner(
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p_first,
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p_last,
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median_of_3(
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p_array[p_first],
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p_array[p_first + (p_last - p_first) / 2],
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p_array[p_last - 1]),
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p_array);
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if (cut <= p_nth) {
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p_first = cut;
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} else {
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p_last = cut;
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}
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}
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insertion_sort(p_first, p_last, p_array);
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}
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inline void unguarded_linear_insert(int p_last, T p_value, T *p_array) const {
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int next = p_last - 1;
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while (compare(p_value, p_array[next])) {
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if (Validate) {
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ERR_BAD_COMPARE(next == 0);
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}
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p_array[p_last] = p_array[next];
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p_last = next;
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next--;
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}
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p_array[p_last] = p_value;
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}
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inline void linear_insert(int p_first, int p_last, T *p_array) const {
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T val = p_array[p_last];
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if (compare(val, p_array[p_first])) {
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for (int i = p_last; i > p_first; i--) {
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p_array[i] = p_array[i - 1];
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}
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p_array[p_first] = val;
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} else {
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unguarded_linear_insert(p_last, val, p_array);
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}
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}
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inline void insertion_sort(int p_first, int p_last, T *p_array) const {
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if (p_first == p_last) {
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return;
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}
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for (int i = p_first + 1; i != p_last; i++) {
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linear_insert(p_first, i, p_array);
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}
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}
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inline void unguarded_insertion_sort(int p_first, int p_last, T *p_array) const {
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for (int i = p_first; i != p_last; i++) {
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unguarded_linear_insert(i, p_array[i], p_array);
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}
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}
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inline void final_insertion_sort(int p_first, int p_last, T *p_array) const {
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if (p_last - p_first > INTROSORT_THRESHOLD) {
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insertion_sort(p_first, p_first + INTROSORT_THRESHOLD, p_array);
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unguarded_insertion_sort(p_first + INTROSORT_THRESHOLD, p_last, p_array);
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} else {
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insertion_sort(p_first, p_last, p_array);
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}
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}
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inline void sort_range(int p_first, int p_last, T *p_array) const {
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if (p_first != p_last) {
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introsort(p_first, p_last, p_array, bitlog(p_last - p_first) * 2);
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final_insertion_sort(p_first, p_last, p_array);
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}
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}
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inline void sort(T *p_array, int p_len) const {
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sort_range(0, p_len, p_array);
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}
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inline void nth_element(int p_first, int p_last, int p_nth, T *p_array) const {
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if (p_first == p_last || p_nth == p_last) {
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return;
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}
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introselect(p_first, p_nth, p_last, p_array, bitlog(p_last - p_first) * 2);
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}
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};
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#endif // SORT_ARRAY_H
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