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00001 // Copyright (C) 2003 Johan Hoffman and Anders Logg. 00002 // Licensed under the GNU GPL Version 2. 00003 00004 #ifndef __SCALAR_EXPRESSION_FUNCTION_H 00005 #define __SCALAR_EXPRESSION_FUNCTION_H 00006 00007 #include <dolfin/FunctionPointer.h> 00008 #include <dolfin/ExpressionFunction.h> 00009 00010 namespace dolfin { 00011 00012 class Cell; 00013 class FiniteElement; 00014 00015 class ScalarExpressionFunction : public ExpressionFunction { 00016 public: 00017 00018 ScalarExpressionFunction(function f); 00019 ~ScalarExpressionFunction(); 00020 00021 // Evaluation of function 00022 real operator() (const Node& n, real t) const; 00023 real operator() (const Node& n, real t); 00024 real operator() (const Point& p, real t) const; 00025 real operator() (const Point& p, real t); 00026 real operator() (real x, real y, real z, real t) const; 00027 real operator() (real x, real y, real z, real t); 00028 00029 // Update values of element function 00030 void update(FunctionSpace::ElementFunction& v, 00031 const FiniteElement& element, 00032 const Cell& cell, real t) const; 00033 00034 // FIXME: works only for nodal basis 00035 void update(NewArray<real>& w, const Cell& cell, const NewPDE& pde) const; 00036 00037 private: 00038 00039 function f; 00040 00041 }; 00042 00043 } 00044 00045 #endif
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