cpp/openttd-patchpack/source Files · src/cmd_helper.h

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rubidium

(svn r16079) -Fix [FS#2824]: insanely fast trains would not stop in time for stations
-Fix: insanely fast trains would sometimes 'jump' over waypoints/via stations within a tick, which would cause the order not to be processed causing the train to go in loops until (with luck) it 'hit' the tile

/* $Id$ */

/** @file cmd_helper.h Helper functions to extract data from command parameters. */

#ifndef CMD_HELPER_H
#define CMD_HELPER_H

#include "direction_type.h"
#include "road_type.h"


template<uint N> static inline void ExtractValid();
template<> inline void ExtractValid<1>() {}


template<typename T> struct ExtractBits;
template<> struct ExtractBits<Axis>          { static const uint Count =  1; };
template<> struct ExtractBits<DiagDirection> { static const uint Count =  2; };
template<> struct ExtractBits<RoadBits>      { static const uint Count =  4; };


template<typename T, uint N, typename U> static inline T Extract(U v)
{
	/* Check if there are enough bits in v */
	ExtractValid<N + ExtractBits<T>::Count <= sizeof(U) * 8>();
	return (T)GB(v, N, ExtractBits<T>::Count);
}

#endif