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A Quick and Simple Memory Allocator

January 1998/A Quick and Simple Memory Allocator/Listing 1

Listing 1: class MemoryAllocator

class MemoryAllocator
    ~MemoryAllocator ();
    MemoryAllocator (uint unit_size, uint block_size =16); 
    MemoryAllocator (uint unit_size, uint block_size, bool debug); 
    void* allocate ();
    void deallocate (void*);
    bool  is_debug () const
        { return _debug; }
    struct Free
        Free* next;
    uint _requested_size;    // memory units requested for allocation
    uint _allocated_size;    // memory units to be allocated
    uint _block_size;        // The number of units in blocks 
    void** _allocated_blocks;    // Array of pointers to blocks
    uint _num_allocated_blocks;  // Number of allocated blocks 
    Free* _free;                 // Linked list of free units
    bool _debug;
    void more() throw(char*);
    void* debug_check(void*&) throw(char*); 
    void* debug_correct(void*&);
    if (!_free)
    void* storage = _free;
    _free = _free->next;
    return _debug ? debug_correct(storage) : storage;
MemoryAllocator::deallocate(void* storage) 
    if (_debug)
    Free* new_free = (Free*) storage;
    new_free->next = _free;
    _free = new_free;
//End of File

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