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camvox/FreeList.h

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/* FreeList.h - Management of regions of memory.
 * Copyright (C) 2008  Take Vos
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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, see <http://www.gnu.org/licenses/>.
 */
#ifndef FREELIST_H
#define FREELIST_H

#include <list>
#include <stdint.h>

namespace camvox {

typedef struct free_region_s free_region_t;

struct free_region_s {
        uint32_t        start;          
        uint32_t        length;         
};

class FreeList {
private:
        uint32_t                        nr_items;       
        std::list<free_region_t *>      regions;        

        void merge(std::list<free_region_t *>::iterator);

public:
        FreeList(uint32_t _nr_items);

        ~FreeList();

        uint32_t alloc();

        void free(uint32_t item_nr);

        uint32_t arraySize();
};

}

#endif