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sort_func.hpp
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1 /* $Id: sort_func.hpp 24900 2013-01-08 22:46:42Z planetmaker $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
6 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
7 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
8 */
9
12 #ifndef SORT_FUNC_HPP
13 #define SORT_FUNC_HPP
14
15 #include "mem_func.hpp"
16
27 template <typename T>
28 static inline void QSortT(T *base, uint num, int (CDECL *comparator)(const T*, const T*), bool desc = false)
29 {
30 if (num < 2) return;
31
32 qsort(base, num, sizeof(T), (int (CDECL *)(const void *, const void *))comparator);
33
34 if (desc) MemReverseT(base, num);
35 }
36
51 template <typename T>
52 static inline void GSortT(T *base, uint num, int (CDECL *comparator)(const T*, const T*), bool desc = false)
53 {
54 if (num < 2) return;
55
56 assert(base != NULL);
57 assert(comparator != NULL);
58
59 T *a = base;
60 T *b = base + 1;
61 uint offset = 0;
62
63 while (num > 1) {
64 const int diff = comparator(a, b);
65 if ((!desc && diff <= 0) || (desc && diff >= 0)) {
66 if (offset != 0) {
67 /* Jump back to the last direction switch point */
68 a += offset;
69 b += offset;
70 offset = 0;
71 continue;
72 }
73
74 a++;
75 b++;
76 num--;
77 } else {
78 Swap(*a, *b);
79
80 if (a == base) continue;
81
82 a--;
83 b--;
84 offset++;
85 }
86 }
87 }
88
89 #endif /* SORT_FUNC_HPP */