Copyright (c) 2012-2014, Bruno Levy
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the ALICE Project-Team nor the names of its
contributors may be used to endorse or promote products derived from this
software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

If you modify this software, you should include a notice giving the
name of the person performing the modification, the date of modification,
and the reason for such modification.

Contact: Bruno Levy

   Bruno.Levy@inria.fr
   http://www.loria.fr/~levy

   ALICE Project
   LORIA, INRIA Lorraine, 
   Campus Scientifique, BP 239
   54506 VANDOEUVRE LES NANCY CEDEX 
   FRANCE

Notice of Modification:

The code has been modified by Bardia Sadri in order to:

1. conform to naming conventions, name spaces, macro definitions, and basic 
   data types of Houdini,

2. enhance thread-safety, through tbb's scalable_malloc allocator as the main 
   allocator instead of the original's own,

3. improve performance,

4. add testing for overflow and underflow, and 

5. collect more diverse statistics about usage.