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/* This file is part of Raul.
 * Copyright (C) 2007-2009 David Robillard <http://drobilla.net>
 *
 * Raul 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 2 of the License, or (at your option) any later
 * version.
 *
 * Raul 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 details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef RAUL_ATOMIC_INT_HPP
#define RAUL_ATOMIC_INT_HPP

#include <glib.h>

namespace Raul {


/** Atomic integer.
 * \ingroup raul
 */
class AtomicInt {
public:
	inline AtomicInt(int val)
		{ g_atomic_int_set(static_cast<volatile gint*>(&_val), val); }

	inline AtomicInt(const AtomicInt& copy)
		{ g_atomic_int_set(static_cast<volatile gint*>(&_val), copy.get()); }

	inline int get() const
		{ return g_atomic_int_get(static_cast<volatile gint*>(&_val)); }

	inline void operator=(int val)
		{ g_atomic_int_set(static_cast<volatile gint*>(&_val), val); }

	inline void operator+=(int val)
		{ g_atomic_int_add(static_cast<volatile gint*>(&_val), val); }

	inline void operator-=(int val)
		{ g_atomic_int_add(static_cast<volatile gint*>(&_val), -val); }

	inline bool operator==(int val) const
		{ return get() == val; }

	inline int operator+(int val) const
		{ return get() + val; }

	inline AtomicInt& operator++() // prefix
		{ g_atomic_int_inc(static_cast<volatile gint*>(&_val)); return *this; }

	inline AtomicInt& operator--() // prefix
		{ g_atomic_int_add(static_cast<volatile gint*>(&_val), -1); return *this; }

	/** Set value to @a val iff current value is @a old.
	 * @return true iff set succeeded.
	 */
	inline bool compare_and_exchange(int old, int val)
		{ return g_atomic_int_compare_and_exchange(static_cast<volatile gint*>(&_val), old, val); }

	/** Add val to value.
	 * @return value immediately before addition took place.
	 */
	inline int exchange_and_add(int val)
		{ return g_atomic_int_exchange_and_add(static_cast<volatile gint*>(&_val), val); }

	/** Decrement value.
	 * @return true if value is now 0, otherwise false.
	 */
	inline bool decrement_and_test()
		{ return g_atomic_int_dec_and_test(static_cast<volatile gint*>(&_val)); }

private:
	volatile mutable int _val;
};


} // namespace Raul

#endif // RAUL_ATOMIC_INT_HPP