RTOpPack_ROpGetElement.hpp

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00003 // 
00004 // RTOp: Interfaces and Support Software for Vector Reduction Transformation
00005 //       Operations
00006 //                Copyright (2006) Sandia Corporation
00007 // 
00008 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00009 // license for use of this work by or on behalf of the U.S. Government.
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
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00019 // Lesser General Public License for more details.
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00029 
00030 #ifndef RTOPPACK_ROP_GET_ELEMENT_HPP
00031 #define RTOPPACK_ROP_GET_ELEMENT_HPP
00032 
00033 #include "RTOpPack_RTOpTHelpers.hpp"
00034 
00035 
00036 namespace RTOpPack {
00037 
00038 
00040 template<class Scalar>
00041 class ROpGetElementEleWiseReductionOp {
00042 public:
00044   ROpGetElementEleWiseReductionOp(const Ordinal &global_i_in = -1)
00045     :global_i_(global_i_in)
00046     {}
00048   Ordinal global_i() const
00049     {
00050       return global_i_;
00051     }
00053   void operator()(const index_type i, const Scalar &v0, Scalar &reduct) const
00054     {
00055       if (i == global_i_) {
00056         reduct = v0;
00057       }
00058     }
00059 private:
00060   Ordinal global_i_;
00061 };
00062 
00063 
00068 template<class Scalar>
00069 class ROpGetElement
00070   : public ROp_1_CoordVariantScalarReduction<
00071         Scalar,
00072         Scalar,
00073         ROpGetElementEleWiseReductionOp<Scalar>
00074       >
00075 {
00076 public:
00078   ROpGetElement(const Ordinal &global_i)
00079     {
00080       this->setOpNameBase("ROpGetElement");
00081       this->initialize(global_i);
00082       this->initReductObjValue(ScalarTraits<Scalar>::zero());
00083     }
00085   void initialize(const Ordinal &global_i)
00086     { 
00087       this->setEleWiseReduction(ROpGetElementEleWiseReductionOp<Scalar>(global_i));
00088     }
00090   Scalar operator()(const ReductTarget& reduct_obj ) const
00091     {
00092       return this->getRawVal(reduct_obj);
00093     }
00094 protected:
00096   virtual Range1D range_impl() const
00097     {
00098       const Ordinal i = this->getEleWiseReduction().global_i();
00099       return Range1D(i, i);
00100     }
00101 
00102 };
00103 
00104 
00105 } // namespace RTOpPack
00106 
00107 
00108 #endif // RTOPPACK_ROP_GET_ELEMENT_HPP
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