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/* $Id$ */

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/** @file autoreplace_base.h Base class for autoreplaces/autorenews. */

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#ifndef AUTOREPLACE_BASE_H

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#define AUTOREPLACE_BASE_H

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#include "oldpool.h"

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#include "autoreplace_type.h"

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typedef uint16 EngineRenewID;

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/**

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 * Memory pool for engine renew elements. DO NOT USE outside of engine.c. Is

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 * placed here so the only exception to this rule, the saveload code, can use

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 * it.

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 */

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DECLARE_OLD_POOL(EngineRenew, EngineRenew, 3, 8000)

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/**

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 * Struct to store engine replacements. DO NOT USE outside of engine.c. Is

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 * placed here so the only exception to this rule, the saveload code, can use

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 * it.

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 */

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struct EngineRenew : PoolItem<EngineRenew, EngineRenewID, &_EngineRenew_pool> {

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	EngineID from;

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	EngineID to;

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	EngineRenew *next;

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	GroupID group_id;

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	EngineRenew(EngineID from = INVALID_ENGINE, EngineID to = INVALID_ENGINE) : from(from), to(to), next(NULL) {}

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	~EngineRenew() { this->from = INVALID_ENGINE; }

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	inline bool IsValid() const { return this->from != INVALID_ENGINE; }

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};

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#define FOR_ALL_ENGINE_RENEWS_FROM(er, start) for (er = GetEngineRenew(start); er != NULL; er = (er->index + 1U < GetEngineRenewPoolSize()) ? GetEngineRenew(er->index + 1U) : NULL) if (er->IsValid())

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#define FOR_ALL_ENGINE_RENEWS(er) FOR_ALL_ENGINE_RENEWS_FROM(er, 0)

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#endif /* AUTOREPLACE_BASE_H */