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/* $Id$ */

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/** @file oldpool_func.h Functions related to the old pool. */

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#ifndef OLDPOOL_FUNC_H

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#define OLDPOOL_FUNC_H

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#include "oldpool.h"

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/**

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 * Allocate a pool item; possibly allocate a new block in the pool.

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 * @param first the first pool item to start searching

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 * @pre first <= Tpool->GetSize()

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 * @return the allocated pool item (or NULL when the pool is full).

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 */

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template<typename T, typename Tid, OldMemoryPool<T> *Tpool> T *PoolItem<T, Tid, Tpool>::AllocateSafeRaw(uint &first)

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{

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	uint last_minus_one = Tpool->GetSize() - 1;

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	for (T *t = Tpool->Get(first); t != NULL; t = (t->index < last_minus_one) ? Tpool->Get(t->index + 1U) : NULL) {

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		if (!t->IsValid()) {

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			first = t->index;

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			Tid index = t->index;

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			memset(t, 0, Tpool->item_size);

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			t->index = index;

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			return t;

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		}

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	}

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	/* Check if we can add a block to the pool */

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	if (Tpool->AddBlockToPool()) return AllocateRaw(first);

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	return NULL;

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}

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/**

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 * Check whether we can allocate an item in this pool. This to prevent the

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 * need to actually construct the object and then destructing it again,

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 * which could be *very* costly.

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 * @return true if and only if at least ONE item can be allocated.

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 */

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template<typename T, typename Tid, OldMemoryPool<T> *Tpool> bool PoolItem<T, Tid, Tpool>::CanAllocateItem()

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{

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	uint last_minus_one = Tpool->GetSize() - 1;

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	for (T *t = Tpool->Get(Tpool->first_free_index); t != NULL; t = (t->index < last_minus_one) ? Tpool->Get(t->index + 1U) : NULL) {

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		if (!t->IsValid()) return true;

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		Tpool->first_free_index = t->index;

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	}

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	/* Check if we can add a block to the pool */

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	if (Tpool->AddBlockToPool()) return CanAllocateItem();

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	return false;

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}

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#endif /* OLDPOOL_FUNC_H */