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In general structures require memory to store data, this is done with Memory objects, differently from STL allocator each memory object allocate and encapsulate the memory. Allocator implementations are not part of the OpenFPM_data module, for this reason they will be not discussed in detail. Possible memory objects are;
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* HeapMemory: This object produce 16 byte aligned memory
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* HeapMemory: This object produce 16 byte aligned heap memory
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* CudaMemory: This object produce GPU memory with a PINNED HOST memory associated
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* PtrMemory: This object does not produce memory but get memory from an external source
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* PtrMemory: This object does not produce memory but get memory from an external memory source
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* PreAllocMemory : This object allocate memory initially and answer to a predetermined sequence of
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allocation useful if you want two distinct structures contiguous in memory (for communication)
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