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Diffstat (limited to 'include/xine/sorted_array.h')
-rw-r--r-- | include/xine/sorted_array.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/include/xine/sorted_array.h b/include/xine/sorted_array.h new file mode 100644 index 000000000..0d229199a --- /dev/null +++ b/include/xine/sorted_array.h @@ -0,0 +1,94 @@ +/* + * Copyright (C) 2000-2006 the xine project + * + * This file is part of xine, a free video player. + * + * xine 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; either version 2 of the License, or + * (at your option) any later version. + * + * xine 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. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA + * + * Sorted array which grows automatically when you add elements. + * A binary search is used to find the position of a new element. + * + * Example: + * Let's create de comparison method for integers: + * + * int int_comparator(void *a, void *b) { + * if ((int)a < (int)b) { + * return -1; + * } else if ((int)a == (int)b) { + * return 0; + * } else { + * return 1; + * } + * } + * + * Create a sorted array for integers: + * xine_sarray_t *sarray = xine_sarray_new(10, int_comparator); + * + * Add elements: + * xine_sarray_add(sarray, (void*)4); + * xine_sarray_add(sarray, (void*)28); + * xine_sarray_add(sarray, (void*)7); + * + * Find an element: + * int pos = xine_sarray_binary_search(sarray, (void*)7); + * if (pos >= 0) + * FOUND + * else + * NOT FOUND + * + * Delete the array: + * xine_sarray_delete(sarray); + */ +#ifndef XINE_SORTED_ARRAY_H +#define XINE_SORTED_ARRAY_H + +#include "array.h" + +/* Array type */ +typedef struct xine_sarray_s xine_sarray_t; + +/* Array element comparator */ +typedef int (*xine_sarray_comparator_t)(void*, void*); + +/* Constructor */ +xine_sarray_t *xine_sarray_new(size_t initial_size, xine_sarray_comparator_t comparator) XINE_MALLOC XINE_PROTECTED; + +/* Destructor */ +void xine_sarray_delete(xine_sarray_t *sarray) XINE_PROTECTED; + +/* Returns the number of element stored in the array */ +size_t xine_sarray_size(const xine_sarray_t *sarray) XINE_PROTECTED; + +/* Removes all elements from an array */ +void xine_sarray_clear(xine_sarray_t *sarray) XINE_PROTECTED; + +/* Adds the element into the array + Returns the insertion position */ +int xine_sarray_add(xine_sarray_t *sarray, void *value) XINE_PROTECTED; + +/* Removes one element from an array at the position specified */ +void xine_sarray_remove(xine_sarray_t *sarray, unsigned int position) XINE_PROTECTED; + +/* Get the element at the position specified */ +void *xine_sarray_get(xine_sarray_t *sarray, unsigned int position) XINE_PROTECTED; + +/* Returns the index of the search key, if it is contained in the list. + Otherwise, (-(insertion point) - 1) or ~(insertion point). + The insertion point is defined as the point at which the key would be + inserted into the array. */ +int xine_sarray_binary_search(xine_sarray_t *sarray, void *key) XINE_PROTECTED; + +#endif + |