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35 lines
1.4 KiB
C++
35 lines
1.4 KiB
C++
/*
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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 "core/enum_type.hpp"
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#include "core/bitmath_func.hpp"
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/**
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* Extracts a given type from a value.
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* @tparam T The type of data we're looking for.
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* @tparam S The offset in the data.
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* @tparam N The amount of bits to read.
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* @tparam U The type of data passed to us.
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* @param v The data to extract the value from.
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*/
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template<typename T, uint S, uint N, typename U> 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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static_assert(N == EnumPropsT<T>::num_bits);
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static_assert(S + N <= sizeof(U) * 8);
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static_assert(EnumPropsT<T>::end <= (1 << N));
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U masked = GB(v, S, N);
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return IsInsideMM(masked, EnumPropsT<T>::begin, EnumPropsT<T>::end) ? (T)masked : EnumPropsT<T>::invalid;
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}
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#endif /* CMD_HELPER_H */
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