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78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
15 years ago
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/* $Id$ */
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/** @file subsidy_base.h Subsidy base class. */
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#ifndef SUBSIDY_BASE_H
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#define SUBSIDY_BASE_H
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#include "cargo_type.h"
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#include "company_type.h"
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/** Struct about subsidies, offered and awarded */
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struct Subsidy {
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CargoID cargo_type; ///< Cargo type involved in this subsidy, CT_INVALID for invalid subsidy
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byte age; ///< Subsidy age; < 12 is unawarded, >= 12 is awarded
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uint16 from; ///< Index of source. Either TownID, IndustryID or StationID, when awarded
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uint16 to; ///< Index of destination. Either TownID, IndustryID or StationID, when awarded
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/**
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* Determines index of this subsidy
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* @return index (in the Subsidy::array array)
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*/
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FORCEINLINE size_t Index() const
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{
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return this - Subsidy::array;
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}
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/**
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* Tests for validity of this subsidy
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* @return is this subsidy valid?
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*/
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FORCEINLINE bool IsValid() const
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{
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return this->cargo_type != CT_INVALID;
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}
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static Subsidy array[MAX_COMPANIES]; ///< Array holding all subsidies
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/**
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* Total number of subsidies, both valid and invalid
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* @return length of Subsidy::array
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*/
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static FORCEINLINE size_t GetArraySize()
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{
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return lengthof(Subsidy::array);
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}
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/**
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* Tests whether given index is an index of valid subsidy
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* @param index index to check
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* @return can this index be used to access a valid subsidy?
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*/
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static FORCEINLINE bool IsValidID(size_t index)
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{
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return index < Subsidy::GetArraySize() && Subsidy::Get(index)->IsValid();
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}
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/**
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* Returns pointer to subsidy with given index
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* @param index index of subsidy
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* @return pointer to subsidy with given index
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*/
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static FORCEINLINE Subsidy *Get(size_t index)
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{
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assert(index < Subsidy::GetArraySize());
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return &Subsidy::array[index];
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}
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static Subsidy *AllocateItem();
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static void Clean();
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};
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#define FOR_ALL_SUBSIDIES_FROM(var, start) for (size_t subsidy_index = start; var = NULL, subsidy_index < Subsidy::GetArraySize(); subsidy_index++) \
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if ((var = Subsidy::Get(subsidy_index))->IsValid())
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#define FOR_ALL_SUBSIDIES(var) FOR_ALL_SUBSIDIES_FROM(var, 0)
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#endif /* SUBSIDY_BASE_H */
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