/usr/include/octave-4.2.2/octave/oct-refcount.h is in liboctave-dev 4.2.2-1ubuntu1.
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) 2012-2017 Jaroslav Hajek
This file is part of Octave.
Octave 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.
Octave 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 Octave; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>.
*/
#if ! defined (octave_oct_refcount_h)
#define octave_oct_refcount_h 1
#include "octave-config.h"
#include "octave-config.h"
#if (defined (OCTAVE_ENABLE_ATOMIC_REFCOUNT) \
&& (defined (__GNUC__) || defined (_MSC_VER)))
# if defined (__GNUC__)
# define OCTAVE_ATOMIC_INCREMENT(x) __sync_add_and_fetch (x, 1)
# define OCTAVE_ATOMIC_DECREMENT(x) __sync_add_and_fetch (x, -1)
# define OCTAVE_ATOMIC_POST_INCREMENT(x) __sync_fetch_and_add (x, 1)
# define OCTAVE_ATOMIC_POST_DECREMENT(x) __sync_fetch_and_add (x, -1)
# elif defined (_MSC_VER)
# include <intrin.h>
# define OCTAVE_ATOMIC_INCREMENT(x) \
_InterlockedIncrement (static_cast<long *> (x))
# define OCTAVE_ATOMIC_DECREMENT(x) \
_InterlockedDecrement (static_cast<long *> (x))
# define OCTAVE_ATOMIC_POST_INCREMENT(x) \
_InterlockedExchangeAdd (static_cast<long *> (x))
# define OCTAVE_ATOMIC_POST_DECREMENT(x) \
_InterlockedExchangeAdd (static_cast<long *> (x))
# endif
#else
// Generic non-locking versions
# define OCTAVE_ATOMIC_INCREMENT(x) ++(*(x))
# define OCTAVE_ATOMIC_DECREMENT(x) --(*(x))
# define OCTAVE_ATOMIC_POST_INCREMENT(x) (*(x))++
# define OCTAVE_ATOMIC_POST_DECREMENT(x) (*(x))--
#endif
// Encapsulates a reference counter.
template <typename T>
class octave_refcount
{
public:
typedef T count_type;
octave_refcount (count_type initial_count)
: count (initial_count)
{ }
// Increment/Decrement. int is postfix.
count_type operator++ (void)
{
return OCTAVE_ATOMIC_INCREMENT (&count);
}
count_type operator++ (int)
{
return OCTAVE_ATOMIC_POST_INCREMENT (&count);
}
count_type operator-- (void)
{
return OCTAVE_ATOMIC_DECREMENT (&count);
}
count_type operator-- (int)
{
return OCTAVE_ATOMIC_POST_DECREMENT (&count);
}
operator count_type (void) const
{
return static_cast<count_type const volatile&> (count);
}
count_type *get (void)
{
return &count;
}
private:
count_type count;
};
#endif
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