Array.hpp

/* This file is part of Raul.
 * Copyright (C) 2007-2009 Dave 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_ARRAY_HPP
#define RAUL_ARRAY_HPP

#include <cassert>
#include <cstdlib>
#include "Deletable.hpp"

namespace Raul {


template <class T>
class Array : public Deletable
{
public:
    Array(size_t size = 0) : _size(size), _top(0), _elems(NULL) {
        if (size > 0)
            _elems = new T[size];
    }

    Array(size_t size, T initial_value) : _size(size), _top(0), _elems(NULL) {
        if (size > 0) {
            _elems = new T[size];
            for (size_t i=0; i < size; ++i)
                _elems[i] = initial_value;
        }
    }

    Array(size_t size, const Array<T>& contents) : _size(size), _top(size+1) {
        _elems = new T[size];
        if (size <= contents.size())
            memcpy(_elems, contents._elems, size * sizeof(T));
        else
            memcpy(_elems, contents._elems, contents.size() * sizeof(T));
    }

    ~Array() {
        delete[] _elems;
    }

    void alloc(size_t num_elems) {
        assert(num_elems > 0);

        delete[] _elems;
        _size = num_elems;
        _top = 0;

        _elems = new T[num_elems];
    }

    void alloc(size_t num_elems, T initial_value) {
        assert(num_elems > 0);

        delete[] _elems;
        _size = num_elems;
        _top = 0;

        _elems = new T[num_elems];
        for (size_t i=0; i < _size; ++i)
            _elems[i] = initial_value;
    }

    void push_back(T n) {
        assert(_top < _size);
        _elems[_top++] = n;
    }

    inline size_t size() const  { return _size; }

    inline T& operator[](size_t i) const { assert(i < _size); return _elems[i]; }

    inline T& at(size_t i) const { assert(i < _size); return _elems[i]; }

private:
    size_t _size;
    size_t _top; // points to empty element above "top" element
    T*     _elems;
};


} // namespace Raul

#endif // RAUL_ARRAY_HPP

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