/usr/include/gpsim/bit.h is in gpsim-dev 0.29.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 1998-2003 T. Scott Dattalo
This file is part of the libgpsim library of gpsim
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see
<http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
#if !defined(__BIT_H__)
#define __BIT_H__
// Function to test the Bit Class:
extern void test_bits();
// Bit
//
// The Bit object is like a bool except that it supports 3-state
// logic.
class RegisterValue;
class Bit
{
public:
Bit(RegisterValue &rv, unsigned int bit_mask);
Bit(bool nd=false, bool ni=false)
: d(nd), i(ni)
{
}
inline void operator = (const Bit &bv)
{
d = bv.d;
i = bv.i;
}
inline bool operator == (const Bit &bv) const
{
return d==bv.d && i==bv.i;
}
inline void operator |= (const Bit &bv)
{
i = (i&bv.i) || (i&d) ||
(bv.d&bv.i);
d |= bv.d;
}
inline void operator &= (const Bit &bv)
{
i = i&bv.i || (i&!bv.d) || (!d&bv.i);
d &= bv.d;
}
inline void operator ^= (const Bit &bv)
{
d ^= bv.d;
i &= bv.i;
}
inline Bit operator & (const Bit &r)
{
Bit bLv = *this;
bLv.i = bLv.i&r.i || (r.i&!r.d) || (!bLv.d&bLv.i);
bLv.d &= r.d;
return bLv;
}
inline Bit operator | (const Bit &bv)
{
Bit bLv = *this;
bLv |= bv;
return bLv;
}
inline Bit operator ^ (const Bit &bv)
{
Bit bLv = *this;
bLv ^= bv;
return bLv;
}
inline bool isZero()
{
return d==false && i==true;
}
inline bool isOne()
{
return d==true && i==true;
}
inline bool isKnown()
{
return i==true;
}
inline bool isUnKnown()
{
return i==false;
}
inline void set(bool nd, bool ni)
{
d = nd;
i = ni;
}
inline void clear()
{
d=false;
i=true;
}
inline void set()
{
d = true;
i = true;
}
inline void setUnknown()
{
i = false;
}
inline char val()
{
return !isKnown() ? '?' : (isOne() ? '1' : '0');
}
friend Bit operator ! (Bit b);
private:
bool d; // The data
bool i; // i=true if d is valid
};
inline Bit operator ! (Bit b)
{
Bit bLv = b;
bLv.d = !bLv.d;
return bLv;
}
#endif
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