/usr/include/octave-4.0.0/octave/oct-refcount.h is in liboctave-dev 4.0.0-3ubuntu9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | /*
Copyright (C) 2012-2015 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
#ifndef OCTAVE_CONFIG_INCLUDED
# error "The file <octave/config.h> must be included before oct-refcount.h."
#endif
#if defined (USE_ATOMIC_REFCOUNT) && (defined (_MSC_VER) || defined (__GNUC__))
# if defined (_MSC_VER)
# include <intrin.h>
# define OCTREFCOUNT_ATOMIC_INCREMENT(x) _InterlockedIncrement((long*)x)
# define OCTREFCOUNT_ATOMIC_DECREMENT(x) _InterlockedDecrement((long*)x)
# define OCTREFCOUNT_ATOMIC_INCREMENT_POST(x) _InterlockedExchangeAdd((long*)x, 1)
# define OCTREFCOUNT_ATOMIC_DECREMENT_POST(x) _InterlockedExchangeAdd((long*)x, -1)
# elif defined (__GNUC__)
# define OCTREFCOUNT_ATOMIC_INCREMENT(x) __sync_add_and_fetch(x, 1)
# define OCTREFCOUNT_ATOMIC_DECREMENT(x) __sync_add_and_fetch(x, -1)
# define OCTREFCOUNT_ATOMIC_INCREMENT_POST(x) __sync_fetch_and_add(x, 1)
# define OCTREFCOUNT_ATOMIC_DECREMENT_POST(x) __sync_fetch_and_add(x, -1)
# endif
#else // Generic non-locking versions
# define OCTREFCOUNT_ATOMIC_INCREMENT(x) ++(*(x))
# define OCTREFCOUNT_ATOMIC_DECREMENT(x) --(*(x))
# define OCTREFCOUNT_ATOMIC_INCREMENT_POST(x) (*(x))++
# define OCTREFCOUNT_ATOMIC_DECREMENT_POST(x) (*(x))--
#endif
// Encapsulates a reference counter.
template <class 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 OCTREFCOUNT_ATOMIC_INCREMENT (&count);
}
count_type operator++(int)
{
return OCTREFCOUNT_ATOMIC_INCREMENT_POST (&count);
}
count_type operator--(void)
{
return OCTREFCOUNT_ATOMIC_DECREMENT (&count);
}
count_type operator--(int)
{
return OCTREFCOUNT_ATOMIC_DECREMENT_POST (&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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