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belugas

(svn r13226) -Feature: Allow to have more than only two airports per town. The number of airports is now controlled by the noise each of them generates, the distance from town's center and how tolerant the town is.
Initial concept : TTDPatch (moreairpots), Initial code : Pasky
Thanks to BigBB (help coding), Smatz Skidd13 and frosch for bugcatches and advices

/* $Id$ */

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

#ifndef AUTOREPLACE_BASE_H
#define AUTOREPLACE_BASE_H

#include "oldpool.h"
#include "autoreplace_type.h"

/**
 * Memory pool for engine renew elements. DO NOT USE outside of engine.c. Is
 * placed here so the only exception to this rule, the saveload code, can use
 * it.
 */
DECLARE_OLD_POOL(EngineRenew, EngineRenew, 3, 8000)

/**
 * Struct to store engine replacements. DO NOT USE outside of engine.c. Is
 * placed here so the only exception to this rule, the saveload code, can use
 * it.
 */
struct EngineRenew : PoolItem<EngineRenew, EngineRenewID, &_EngineRenew_pool> {
	EngineID from;
	EngineID to;
	EngineRenew *next;
	GroupID group_id;

	EngineRenew(EngineID from = INVALID_ENGINE, EngineID to = INVALID_ENGINE) : from(from), to(to), next(NULL) {}
	~EngineRenew() { this->from = INVALID_ENGINE; }

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

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

#endif /* AUTOREPLACE_BASE_H */