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61 lines
1.9 KiB
61 lines
1.9 KiB
/* aKode Arithmetics
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Copyright (C) 2004 Allan Sandfeld Jensen <kde@carewolf.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#ifndef _AKODE_ARITHMETIC_H
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#define _AKODE_ARITHMETIC_H
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// Parametirize the difference in aritmetics between floating point and integer.
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template<typename S>
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struct Arithm_FP {
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static inline S div(S value, S divisor) {
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return value/divisor;
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}
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static inline S rem(S, S) {
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return 0.0;
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}
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static inline S muldiv(S value, S multiplier, S divisor) {
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return (value*multiplier)/divisor;
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}
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static inline S max(int) {
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return 1.0;
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}
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};
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template<typename S>
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struct Arithm_Int {
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static inline S div(S value, S divisor) {
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return value / divisor;
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}
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static inline S rem(S value, S divisor) {
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return value % divisor;
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}
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// A multiplication and division that avoids overflow
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static inline S muldiv(S value, S multiplier, S divisor) {
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S out = Arithm_Int<S>::div(value, divisor)*multiplier;
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S rem = Arithm_Int<S>::rem(value, divisor)*multiplier;
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out += div(rem, divisor);
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return out;
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}
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static inline S max(int bits) {
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return (((S)1)<<(bits-1))-1;
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}
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};
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#endif
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