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Added stub fixed point class implementation

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This commit is contained in:
Danny Robson 2011-08-08 16:44:30 +10:00
parent dbad60cf10
commit 3fa14e88e0
3 changed files with 186 additions and 0 deletions
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2
Makefile.am
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@ -12,6 +12,7 @@ UTIL_INCLUDE = \
debug.hpp \
enable_if.hpp \
except.hpp \
fixed.hpp \
float.hpp \
io.hpp \
ip.hpp \
@ -32,6 +33,7 @@ UTIL_INCLUDE = \
UTIL_FILES = \
debug.cpp \
except.cpp \
fixed.cpp \
float.cpp \
io.cpp \
ip.cpp \

119
fixed.cpp Normal file
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@ -0,0 +1,119 @@
/*
* This file is part of libgim.
*
* libgim 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, either version 3 of the License, or (at your option) any later
* version.
*
* libgim 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 libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2011 Danny Robson <danny@blubinc.net>
*/
#include "fixed.hpp"
#include <cmath>
/*
* Constructors
*/
template <unsigned int INT, unsigned int FRAC>
fixed<INT, FRAC>::fixed (integral_type val):
m_value (val << FRAC)
{
static_assert (INT > 0, "must use positive integer bits");
static_assert (FRAC > 0, "must use positive fractional bits");
}
/*
* Conversions
*/
template <unsigned int INT, unsigned int FRAC>
double
fixed<INT, FRAC>::to_double (void) const
{ return m_value / std::pow (2.0, FRAC); }
template <unsigned int INT, unsigned int FRAC>
float
fixed<INT, FRAC>::to_float (void) const
{ return m_value / std::pow (2.0f, FRAC); }
template <unsigned int INT, unsigned int FRAC>
typename fixed<INT, FRAC>::integral_type
fixed<INT, FRAC>::to_integral (void) const
{ return m_value >> FRAC; }
/*
* Integral operators
*/
template <unsigned int INT, unsigned int FRAC>
fixed<INT, FRAC>&
fixed<INT, FRAC>::operator +=(integral_type val) {
m_value += val << FRAC;
return *this;
}
template <unsigned int INT, unsigned int FRAC>
fixed<INT, FRAC>&
fixed<INT, FRAC>::operator -=(integral_type val) {
m_value -= val << FRAC;
return *this;
}
template <unsigned int INT, unsigned int FRAC>
fixed<INT, FRAC>&
fixed<INT, FRAC>::operator *=(integral_type val) {
m_value *= val;
return *this;
}
template <unsigned int INT, unsigned int FRAC>
fixed<INT, FRAC>&
fixed<INT, FRAC>::operator /=(integral_type val) {
m_value /= val;
return *this;
}
template <unsigned int INT, unsigned int FRAC>
fixed<INT, FRAC>
fixed<INT, FRAC>::operator +(integral_type val) const
{ return fixed<INT, FRAC>(m_value + val << FRAC); }
template <unsigned int INT, unsigned int FRAC>
fixed<INT, FRAC>
fixed<INT, FRAC>::operator -(integral_type val) const
{ return fixed<INT, FRAC>(m_value - val << FRAC); }
template <unsigned int INT, unsigned int FRAC>
fixed<INT, FRAC>
fixed<INT, FRAC>::operator *(integral_type val) const
{ return fixed<INT, FRAC>(m_value * val); }
template <unsigned int INT, unsigned int FRAC>
fixed<INT, FRAC>
fixed<INT, FRAC>::operator /(integral_type val) const
{ return fixed<INT, FRAC>(m_value / val); }
template class fixed<16,16>;
template class fixed<32,32>;

65
fixed.hpp Normal file
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@ -0,0 +1,65 @@
/*
* This file is part of libgim.
*
* libgim 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, either version 3 of the License, or (at your option) any later
* version.
*
* libgim 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 libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2011 Danny Robson <danny@blubinc.net>
*/
#ifndef __UTIL_FIXED_HPP
#define __UTIL_FIXED_HPP
#include "types.hpp"
#include <cstdint>
template <unsigned int INT, unsigned int FRAC>
class fixed {
public:
typedef typename bits_type<INT + FRAC>::uint combined_type;
typedef typename bits_type<INT + FRAC>::uint integral_type;
combined_type m_value;
public:
explicit fixed(double);
explicit fixed(float);
explicit fixed(integral_type);
double to_double (void) const;
float to_float (void) const;
integral_type to_integral (void) const;
fixed<INT,FRAC>& operator +=(const fixed<INT,FRAC>);
fixed<INT,FRAC>& operator -=(const fixed<INT,FRAC>);
fixed<INT,FRAC>& operator *=(const fixed<INT,FRAC>);
fixed<INT,FRAC>& operator /=(const fixed<INT,FRAC>);
fixed<INT,FRAC> operator +(const fixed<INT,FRAC>) const;
fixed<INT,FRAC> operator -(const fixed<INT,FRAC>) const;
fixed<INT,FRAC> operator *(const fixed<INT,FRAC>) const;
fixed<INT,FRAC> operator /(const fixed<INT,FRAC>) const;
fixed<INT,FRAC>& operator +=(integral_type);
fixed<INT,FRAC>& operator -=(integral_type);
fixed<INT,FRAC>& operator *=(integral_type);
fixed<INT,FRAC>& operator /=(integral_type);
fixed<INT,FRAC> operator +(integral_type) const;
fixed<INT,FRAC> operator -(integral_type) const;
fixed<INT,FRAC> operator *(integral_type) const;
fixed<INT,FRAC> operator /(integral_type) const;
};
#endif // __UTIL_FIXED_HPP