mirror of https://github.com/OpenTTD/OpenTTD.git
37 lines
1.4 KiB
C++
37 lines
1.4 KiB
C++
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file cmd_helper.h Helper functions to extract data from command parameters. */
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#ifndef CMD_HELPER_H
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#define CMD_HELPER_H
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#include "direction_type.h"
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#include "road_type.h"
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template<uint N> static inline void ExtractValid();
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template<> inline void ExtractValid<1>() {}
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template<typename T> struct ExtractBits;
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template<> struct ExtractBits<Axis> { static const uint Count = 1; };
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template<> struct ExtractBits<DiagDirection> { static const uint Count = 2; };
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template<> struct ExtractBits<RoadBits> { static const uint Count = 4; };
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template<typename T, uint N, typename U> static inline T Extract(U v)
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{
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/* Check if there are enough bits in v */
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ExtractValid<N + ExtractBits<T>::Count <= sizeof(U) * 8>();
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return (T)GB(v, N, ExtractBits<T>::Count);
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}
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#endif
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