cfifo.hpp

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/* Copyright (c) 2012 Taneli Kalvas. All rights reserved.
 *
 * You can redistribute this software 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.
 * 
 * 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this library (file "COPYING" included in the package);
 * if not, write to the Free Software Foundation, Inc., 51 Franklin
 * Street, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * If you have questions about your rights to use or distribute this
 * software, please contact Berkeley Lab's Technology Transfer
 * Department at TTD@lbl.gov. Other questions, comments and bug
 * reports should be sent directly to the author via email at
 * taneli.kalvas@jyu.fi.
 * 
 * NOTICE. This software was developed under partial funding from the
 * U.S.  Department of Energy.  As such, the U.S. Government has been
 * granted for itself and others acting on its behalf a paid-up,
 * nonexclusive, irrevocable, worldwide license in the Software to
 * reproduce, prepare derivative works, and perform publicly and
 * display publicly.  Beginning five (5) years after the date
 * permission to assert copyright is obtained from the U.S. Department
 * of Energy, and subject to any subsequent five (5) year renewals,
 * the U.S. Government is granted for itself and others acting on its
 * behalf a paid-up, nonexclusive, irrevocable, worldwide license in
 * the Software to reproduce, prepare derivative works, distribute
 * copies to the public, perform publicly and display publicly, and to
 * permit others to do so.
 */
 
#ifndef CFIFO_HPP
#define CFIFO_HPP 1
 
 
#include "error.hpp"
 
 
template <class T, int N>
class CFiFo {
 
    int      _size;
    int      _next;
    T        _data[N];
 
public:
 
    CFiFo() 
        : _size(0), _next(0) {
    }
 
    ~CFiFo() {
 
    }
 
    int size( void ) const {
        return( _size );
    }
 
    void clear( void ) {
        _size = 0;
        _next = 0;
    }
 
    void push( const T &x ) {
        _data[_next] = x;
        _next++;
        if( _next == N )
            _next = 0;
        if( _size < N )
            _size++;
    }
 
    const T &operator[]( int i ) const {
        if( i < 0 )
            throw( ErrorRange( ERROR_LOCATION, "Trying to access negative index" ) );
        else if( i >= _size )
            throw( ErrorRange( ERROR_LOCATION, "Trying to access beyond fifo end" ) );
        int access = _next-i-1;
        if( access < 0 )
            access += _size;
        return( _data[access] );
    };
 
};
 
 
#endif