122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2011 Danny Robson <danny@nerdcruft.net>
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*/
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#include "fixed.hpp"
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#include <cmath>
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/*
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* Constructors
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*/
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template <unsigned int INT, unsigned int FRAC>
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fixed<INT, FRAC>::fixed (integral_type val):
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m_value (val << FRAC)
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{
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static_assert (INT > 0, "must use positive integer bits");
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static_assert (FRAC > 0, "must use positive fractional bits");
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static_assert (INT + FRAC == sizeof (m_value) * 8,
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"underlying storage must be exactly int:frac sized");
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}
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/*
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* Conversions
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*/
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template <unsigned int INT, unsigned int FRAC>
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double
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fixed<INT, FRAC>::to_double (void) const
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{ return m_value / std::pow (2.0, FRAC); }
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template <unsigned int INT, unsigned int FRAC>
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float
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fixed<INT, FRAC>::to_float (void) const
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{ return m_value / std::pow (2.0f, FRAC); }
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template <unsigned int INT, unsigned int FRAC>
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typename fixed<INT, FRAC>::integral_type
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fixed<INT, FRAC>::to_integral (void) const
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{ return m_value >> FRAC; }
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/*
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* Integral operators
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*/
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template <unsigned int INT, unsigned int FRAC>
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fixed<INT, FRAC>&
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fixed<INT, FRAC>::operator +=(integral_type val) {
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m_value += val << FRAC;
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return *this;
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}
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template <unsigned int INT, unsigned int FRAC>
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fixed<INT, FRAC>&
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fixed<INT, FRAC>::operator -=(integral_type val) {
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m_value -= val << FRAC;
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return *this;
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}
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template <unsigned int INT, unsigned int FRAC>
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fixed<INT, FRAC>&
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fixed<INT, FRAC>::operator *=(integral_type val) {
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m_value *= val;
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return *this;
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}
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template <unsigned int INT, unsigned int FRAC>
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fixed<INT, FRAC>&
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fixed<INT, FRAC>::operator /=(integral_type val) {
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m_value /= val;
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return *this;
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}
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template <unsigned int INT, unsigned int FRAC>
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fixed<INT, FRAC>
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fixed<INT, FRAC>::operator +(integral_type val) const
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{ return fixed<INT, FRAC>(m_value + val << FRAC); }
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template <unsigned int INT, unsigned int FRAC>
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fixed<INT, FRAC>
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fixed<INT, FRAC>::operator -(integral_type val) const
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{ return fixed<INT, FRAC>(m_value - val << FRAC); }
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template <unsigned int INT, unsigned int FRAC>
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fixed<INT, FRAC>
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fixed<INT, FRAC>::operator *(integral_type val) const
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{ return fixed<INT, FRAC>(m_value * val); }
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template <unsigned int INT, unsigned int FRAC>
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fixed<INT, FRAC>
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fixed<INT, FRAC>::operator /(integral_type val) const
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{ return fixed<INT, FRAC>(m_value / val); }
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template class fixed<16,16>;
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template class fixed<32,32>;
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