d2/filter/zero.h

   1 // Copyright 2004 David Hilvert <dhilvert@auricle.dyndns.org>,
   2 //                              <dhilvert@ugcs.caltech.edu>
   3
   4 /*  This file is part of the Anti-Lamenessing Engine.
   5
   6     The Anti-Lamenessing Engine is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     The Anti-Lamenessing Engine is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with the Anti-Lamenessing Engine; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 #ifndef __zero_h__
  22 #define __zero_h__
  23
  24 /*
  25  * A zero filter.
  26  */
  27
  28 class zero : public filter {
  29 public:
  30
  31         /*
  32          * Size of filter support, in number of half-cycles to each side of the
  33          * filter center.
  34          */
  35         ale_real support() const {
  36                 return 0;
  37         }
  38
  39         virtual int equals(const filter *f) const {
  40                 if (typeid(*f) == typeid(*this))
  41                         return 1;
  42                 return 0;
  43         }
  44
  45         /*
  46          * Response of filter at point p
  47          */
  48         virtual ale_real response(point p) const {
  49                 return 0;
  50         }
  51 };
  52 #endif