00001 /* @HEADER@ */ 00002 // ************************************************************************ 00003 // 00004 // Sundance 00005 // Copyright (2005) Sandia Corporation 00006 // 00007 // Copyright (year first published) Sandia Corporation. Under the terms 00008 // of Contract DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government 00009 // retains certain rights in this software. 00010 // 00011 // This library is free software; you can redistribute it and/or modify 00012 // it under the terms of the GNU Lesser General Public License as 00013 // published by the Free Software Foundation; either version 2.1 of the 00014 // License, or (at your option) any later version. 00015 // 00016 // This library is distributed in the hope that it will be useful, but 00017 // WITHOUT ANY WARRANTY; without even the implied warranty of 00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00019 // Lesser General Public License for more details. 00020 // 00021 // You should have received a copy of the GNU Lesser General Public 00022 // License along with this library; if not, write to the Free Software 00023 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 00024 // USA 00025 // Questions? Contact Kevin Long (krlong@sandia.gov), 00026 // Sandia National Laboratories, Livermore, California, USA 00027 // 00028 // ************************************************************************ 00029 /* @HEADER@ */ 00030 00031 #ifndef SUNDANCE_EXPR_COMPARISON_H 00032 #define SUNDANCE_EXPR_COMPARISON_H 00033 00034 namespace Sundance 00035 { 00036 00037 class Expr; 00038 00039 /** 00040 * Base class for callback that computes distance between discrete functions 00041 */ 00042 class ExprComparisonBase 00043 { 00044 public: 00045 /** */ 00046 virtual double diff(const Expr& u1, const Expr& u2) const = 0 ; 00047 }; 00048 00049 /** Default comparison computes Euclidean distance between vectors */ 00050 class DefaultExprComparison : public ExprComparisonBase 00051 { 00052 public: 00053 /** */ 00054 DefaultExprComparison(); 00055 00056 /** */ 00057 double diff(const Expr& u1, const Expr& u2) const ; 00058 }; 00059 00060 00061 00062 } 00063 00064 00065 #endif