3dpcp/include/slam6d/allocator.h

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2012-09-16 12:33:11 +00:00
/**
* @file
* @brief allocator object that gets chunks of memory and then hands parts of them to a user
* @author Jan Elsberg. Automation Group, Jacobs University Bremen gGmbH, Germany.
* @author Thomas Escher
*/
#ifndef ALLOCATOR_H
#define ALLOCATOR_H
#include <vector>
class Allocator {
public:
virtual ~Allocator() {}
template<typename T>
T* allocate(unsigned int nr = 1) { return reinterpret_cast<T*>(allocate(nr*sizeof(T))); }
virtual void printSize() const = 0;
protected:
virtual unsigned char* allocate(unsigned int size) = 0;
};
class ChunkAllocator : public Allocator {
public:
ChunkAllocator(unsigned int _csize = (1 << 20));
~ChunkAllocator();
void printSize() const;
protected:
unsigned char* allocate(unsigned int size);
private:
std::vector<unsigned char *> mem;
const unsigned int chunksize;
unsigned int index;
unsigned long int memsize;
unsigned long int wastedspace;
};
class PackedChunkAllocator : public Allocator {
public:
PackedChunkAllocator(unsigned int _csize = (1<<20));
~PackedChunkAllocator();
void printSize() const;
protected:
unsigned char* allocate(unsigned int size);
private:
std::vector<unsigned char *> mem;
std::vector<unsigned int > index;
const unsigned int chunksize;
unsigned long int memsize;
};
class SequentialAllocator : public Allocator {
public:
//! Handle a preallocated memory up to \a max_size.
SequentialAllocator(unsigned char* base_ptr, unsigned int max_size);
~SequentialAllocator();
void printSize() const;
protected:
unsigned char* allocate(unsigned int size);
private:
unsigned char* m_base_ptr;
unsigned int m_size, m_index;
};
#endif