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

Files @ r6888:f2ab5d0e6596

Branch filter:

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

r6888:f2ab5d0e6596 733 B text/x-c Show Annotation Show as Raw Download as Raw

rubidium

(svn r10131) -Fix [FS#810]: when removing a dock, a ship will always try to reach the old location of the dock even when it cannot anymore because it the old location of the dock is now land instead of water.

/* $Id$ */

#ifndef CMD_HELPER_H
#define CMD_HELPER_H

#include "direction.h"
#include "macros.h"
#include "road.h"


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