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

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Location: cpp/openttd-patchpack/source/src/cmd_helper.h

r9583:b6e25a00b908 801 B text/x-c Show Annotation Show as Raw Download as Raw

rubidium

(svn r13621) -Fix: building roadbits in the wrong direction on bridges or building roadbits from underneath the bridge to the bridgehead is impossible, so don't silently ignore that error when building over houses and industries is not ignored.

/* $Id$ */

/** @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