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