array.h

/*
 * This file is part of libsidplayfp, a SID player engine.
 *
 *  Copyright (C) 2011 Leandro Nini
 *
 *  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 of the License, 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef ARRAY_H
#define ARRAY_H
 
class counter
{
private:
    unsigned int c;
 
public:
    counter() : c(1) {}
    void increase() { ++c; }
    unsigned int decrease() { return --c; }
};
 
template<typename T>
class array
{
private:
    counter* count;
    const unsigned int x, y;
    T* data;
 
public:
    array(unsigned int x, unsigned int y) :
        count(new counter()),
        x(x),
        y(y),
        data(new T[x * y]) {}
 
    array(const array& p) :
        count(p.count),
        x(p.x),
        y(p.y),
        data(p.data) { count->increase(); }
 
    ~array() { if (count->decrease() == 0) { delete count; delete [] data; } }
 
    unsigned int length() const { return x * y; }
 
    T* operator[](unsigned int a) { return a < x ? &data[a * y] : 0; }
 
    T const* operator[](unsigned int a) const { return a < x ? &data[a * y] : 0; }
};
 
typedef array<short> matrix_t;
 
#endif