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/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file subsidy_base.h %Subsidy base class. */
#ifndef SUBSIDY_BASE_H
#define SUBSIDY_BASE_H
#include "cargo_type.h"
#include "company_type.h"
#include "subsidy_type.h"
#include "core/pool_type.hpp"
typedef Pool<Subsidy, SubsidyID, 1, 256> SubsidyPool;
extern SubsidyPool _subsidy_pool;
/** Struct about subsidies, offered and awarded */
struct Subsidy : SubsidyPool::PoolItem<&_subsidy_pool> {
CargoID cargo_type; ///< Cargo type involved in this subsidy, CT_INVALID for invalid subsidy
byte remaining; ///< Remaining months when this subsidy is valid
CompanyByte awarded; ///< Subsidy is awarded to this company; INVALID_COMPANY if it's not awarded to anyone
SourceTypeByte src_type; ///< Source of subsidised path (ST_INDUSTRY or ST_TOWN)
SourceTypeByte dst_type; ///< Destination of subsidised path (ST_INDUSTRY or ST_TOWN)
SourceID src; ///< Index of source. Either TownID or IndustryID
SourceID dst; ///< Index of destination. Either TownID or IndustryID
/**
* We need an (empty) constructor so struct isn't zeroed (as C++ standard states)
*/
inline Subsidy() { }
/**
* (Empty) destructor has to be defined else operator delete might be called with NULL parameter
*/
inline ~Subsidy() { }
/**
* Tests whether this subsidy has been awarded to someone
* @return is this subsidy awarded?
*/
inline bool IsAwarded() const
{
return this->awarded != INVALID_COMPANY;
}
void AwardTo(CompanyID company);
};
/** Constants related to subsidies */
static const uint SUBSIDY_OFFER_MONTHS = 12; ///< Duration of subsidy offer
static const uint SUBSIDY_CONTRACT_MONTHS = 12; ///< Duration of subsidy after awarding
static const uint SUBSIDY_PAX_MIN_POPULATION = 400; ///< Min. population of towns for subsidised pax route
static const uint SUBSIDY_CARGO_MIN_POPULATION = 900; ///< Min. population of destination town for cargo route
static const uint SUBSIDY_MAX_PCT_TRANSPORTED = 42; ///< Subsidy will be created only for towns/industries with less % transported
static const uint SUBSIDY_MAX_DISTANCE = 70; ///< Max. length of subsidised route (DistanceManhattan)
#define FOR_ALL_SUBSIDIES_FROM(var, start) FOR_ALL_ITEMS_FROM(Subsidy, subsidy_index, var, start)
#define FOR_ALL_SUBSIDIES(var) FOR_ALL_SUBSIDIES_FROM(var, 0)
#endif /* SUBSIDY_BASE_H */
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