circ.h

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/*
 * SPUC - Signal processing using C++ - A DSP library
 * 
 * This program 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, or (at your option)
 * any later version.
 * 
 * This program 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 program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef CIRCB
#define CIRCB
namespace SPUC {
// Circular buffer class
template <class T> class circ_buffer {

 protected:
        int     len;
        int     ptr;
        T       *buf;

 public:
        circ_buffer(void) : buf(NULL), len(0), ptr(0) { ; }
        circ_buffer(const circ_buffer<T>& A);
        circ_buffer(int d);
        circ_buffer(int d, T init_value);
        ~circ_buffer(void) {
                delete[] buf;
        }

        int size(void) const {return len;};

        T operator [](int i) const {
                return buf[(ptr+i)%len];
        };
        circ_buffer<T> circ_buffer::operator =(circ_buffer<T>& A);
        void put(T data_in) {
                ptr = (ptr-1+len)%len;
                buf[ptr] = data_in;
        }
};

template <class T> circ_buffer<T>::circ_buffer(const circ_buffer<T>& A)
{
        len = A.len;
        ptr = A.ptr;
        buf = new T[len];
        for (int i = 0; i < len; i++) buf[i] = A.buf[i];

}       
// copy constructor
template <class T> circ_buffer<T>::circ_buffer(int len1)
{
        len = len1;
        ptr = len-1;
        buf = new T[len];
}

template <class T> circ_buffer<T>::circ_buffer(int len1, T init_value)
{
        circ_buffer(len1);
        for (int i= 0; i < len; i++)    buf[i] = init_value;
}

template <class T> circ_buffer<T> circ_buffer<T>::operator =(circ_buffer<T>& A)
{
        if (this->len != A.size())      {
                // remove existing circ
                delete[] buf;
                // create room for A
                len = A.size();
                buf = new T[len];
        }
        ptr = A.ptr;

        for (int i = 0; i < len; i++)   buf[i] = A.buf[i];
        return *this;
}
}
#endif

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