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Posted 25 Nov 2009

Arena Allocator, DTOR and Embedded Preallocated Buffer

, 25 Nov 2009
Arena like memory management, embedding allocations inside Arena, DTOR, context thinking
////////////////////////////////////////////////////////////////////////////////////////////////////
// \file arena_allocator.cpp : implementation of arena allocation schema
//
// Afftar: Reuven Bass - inspired by Mamasha Knows
////////////////////////////////////////////////////////////////////////////////////////////////////

#include "StdAfx.h"
#include "arena_allocator.h"



////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////


namespace unitest {

/**/
void arena_simple_usage()
{
	struct SomeSt {
		double d;
		int    i;

		SomeSt()				{;}
		SomeSt(double, int)		{;}
	};

	Arena arena;
	SomeSt* p1   = new (arena) SomeSt[20];
	double* darr = new (arena) double[4000];

	arena.DTOR(p1, 20);

	SomeSt* p4 = new (arena) SomeSt[10];
	SomeSt* p5 = new (arena) SomeSt(10., 30);

	for (int i = 10000; i-- > 0; )
		arena.DTOR(new (arena) SomeSt);

	arena.DTOR(p4, 10);
	arena.DTOR(p5);
}


/**/
void my_arena_usage()
{
	struct SomeSt {
		double d;
		int    i;

		SomeSt()				{;}
		SomeSt(double, int)		{;}
		~SomeSt()				{ printf("SomeSt::DTOR() %d\n", i); }
	};

	MyArena<256> arena;

	SomeSt* p4 = new (arena) SomeSt[3];
	SomeSt* p5 = new (arena) SomeSt(10., 30);

	p4[0].i = 10;
	p4[1].i = 20;
	p4[2].i = 30;

	p5->i = 500;

	arena.DTOR(p4, 3);
	arena.DTOR(p5);

	arena.clear();

	int st_size = sizeof(SomeSt);
	p4 = new (arena) SomeSt[3];
	p5 = new (arena) SomeSt(10., 30);

	p4[0].i = 10;
	p4[1].i = 20;
	p4[2].i = 30;

	p5->i = 500;

	arena.DTOR(p4, 3);
	arena.DTOR(p5);
}

using namespace boost::intrusive;

class MyStruct
	: public slist_base_hook<>
{
public:
	int indx_;
};

typedef slist<MyStruct> AList;

/**/
void slist_usecase()
{
	AList l1;
	AList l2;
	
	MyStruct* p = new MyStruct[3];

	p[0].indx_ = 0;
	p[1].indx_ = 1;
	p[2].indx_ = 2;

//	l1.push_back(p[0]);
//	l1.push_back(p[1]);
//	l1.push_back(p[2]);

	l2.push_front(p[0]);
	l2.push_front(p[1]);
	l2.push_front(p[2]);

	for ( AList::iterator it(l2.begin()), end(l2.end()); it != end; ++it )
		printf("%d\n", it->indx_);

	return;
}


/**/
void arena_usecases()
{
	arena_simple_usage();
	my_arena_usage();
	return;

	return;

	slist_usecase();
	return;
}

}	// namespace unitest

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About the Author

Mamasha Knows
Chief Technology Officer Cpp2Mtl Integration Solutions
United States United States
My real name is Reuven Bass. My first article here was published under the Mamasha Knows pseudonym. It worked. So, I stay with Mamasha for a while. (If it works - do not touch it)

Programming became my life from thirteen. I love coding. I love beauty. I always try to combine coding and beauty.

RB

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