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/* $Id$ */
/*
* 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 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
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