Dune::Pool< T, s > Class Template Reference

A memory pool of objects. More...

#include <dune/common/poolallocator.hh>

Public Types
enum	{   unionSize , size , alignment = Lcm<alignof(MemberType), alignof(Reference)>::value , alignedSize ,   chunkSize , elements = ((chunkSize - alignment + 1)/ alignedSize) }
typedef T	MemberType
	The type of object we allocate memory for.

Public Member Functions
	Pool ()
	Constructor.
	~Pool ()
	Destructor.
void *	allocate ()
	Get a new or recycled object. More...
void	free (void *o)
	Free an object. More...
void	print (std::ostream &os)
	Print elements in pool for debugging.

Detailed Description

template<class T, std::size_t s>
class Dune::Pool< T, s >

A memory pool of objects.

The memory for the objects is organized in chunks. Each chunks is capable of holding a specified number of objects. The allocated objects will be properly aligned for fast access. Deallocated objects are cached for reuse to prevent memory fragmentation.

Warning

If the size of the objects allocated is less than the size of a pointer memory is wasted.

Due to aligned issues at the number of bytes of the alignment prerequisite (< 4 bytes) are wasted. This effect becomes negligible for big sizes of chunkSize.

Template Parameters

T	The type that is allocated by us.
s	The size of a memory chunk in bytes.

Member Enumeration Documentation

anonymous enum

template<class T , std::size_t s>

anonymous enum

Enumerator
unionSize	The size of a union of Reference and MemberType.
size	Size requirement. At least one object has to stored.
alignment	The alignment that suits both the MemberType and the Reference (i.e. their least common multiple).
alignedSize	The aligned size of the type. This size is bigger than sizeof of the type and a multiple of the alignment requirement.
chunkSize	The size of each chunk memory chunk. Will be adapted to be a multiple of the alignment plus an offset to handle the case that the pointer to the memory does not satisfy the alignment requirements.
elements	The number of element each chunk can hold.

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The documentation for this class was generated from the following file:

• dune/common/poolallocator.hh