Builder.h

/*
 *  stree::Builder class interface
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2013, IRIT UPS.
 *
 *  OTAWA 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.
 *
 *  OTAWA 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 OTAWA; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef ELM_STREE_BUILDER_H_
#define ELM_STREE_BUILDER_H_
 
#include <elm/stree/Tree.h>
 
namespace elm { namespace stree {
 
template <class K, class T, class C = Comparator<K> >
class Builder {
protected:
    typedef typename Tree<K, T, C>::node_t node_t;
 
    node_t *allocate(t::uint32 n) {
        int s = n + leastUpperPowerOf2(n) - 1;
        return new node_t[s];
    }
 
    int make(node_t *nodes, int& s, int start, int end) {
        if(start == end)
            return start;
        else {
            int m = (start + end) / 2,
                l = make(nodes, s, start, m),
                u = make(nodes, s, m + 1, end);
            int p = s;
            nodes[s++] = node_t(nodes, l, u);
            return p;
        }
    }
};
 
} }     // elm::stree
 
#endif /* ELM_STREE_BUILDER_H_ */