default_test_trial_integral_imp.hpp

// Copyright (C) 2011-2012 by the BEM++ Authors
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#ifndef fiber_default_test_trial_integral_imp_hpp
#define fiber_default_test_trial_integral_imp_hpp

#include "default_test_trial_integral.hpp"

#include "geometrical_data.hpp"

#include <algorithm>

namespace Fiber
{

/*
template <typename BasisFunctionType_, typename KernelType_,
          typename ResultType_>
class IntegrandFunctor
{
public:
    typedef BasisFunctionType_ BasisFunctionType;
    typedef KernelType_ KernelType;
    typedef ResultType_ ResultType;
    typedef typename ScalarTraits<ResultType>::RealType CoordinateType;

    void addGeometricalDependencies(int& geomDeps) const;

    ResultType evaluate(
            const ConstGeometricalDataSlice<CoordinateType>& geomData,
            const CollectionOf1dSlicesOfConst3dArrays<BasisFunctionType>&
            testTransformations,
            const CollectionOf1dSlicesOfConst3dArrays<BasisFunctionType>&
            trialTransformations) const;
};
*/

template <typename IntegrandFunctor>
void DefaultTestTrialIntegral<IntegrandFunctor>::
addGeometricalDependencies(size_t& geomDeps) const
{
    geomDeps |= INTEGRATION_ELEMENTS;
    m_functor.addGeometricalDependencies(geomDeps);
}

template <typename IntegrandFunctor>
void DefaultTestTrialIntegral<IntegrandFunctor>::evaluate(
        const GeometricalData<CoordinateType>& geomData,
        const CollectionOf3dArrays<BasisFunctionType>& testValues,
        const CollectionOf3dArrays<BasisFunctionType>& trialValues,
        const std::vector<CoordinateType>& weights,
        arma::Mat<ResultType>& result) const
{
    const size_t pointCount = weights.size();
    assert(testValues.size() == 1);
    assert(trialValues.size() == 1);

    // We don't care about the number of rows of testValues[0] and trialValues[0]
    // -- it's up to the integrand functor
    const size_t testDofCount = testValues[0].extent(1);
    const size_t trialDofCount = trialValues[0].extent(1);
    assert(testValues[0].extent(2) == pointCount);
    assert(trialValues[0].extent(2) == pointCount);
    for (size_t trialDof = 0; trialDof < trialDofCount; ++trialDof)
        for (size_t testDof = 0; testDof < testDofCount; ++testDof) {
            ResultType sum = 0.;
            for (size_t point = 0; point < pointCount; ++point)
                sum += m_functor.evaluate(
                            geomData.const_slice(point),
                            testValues.const_slice(testDof, point),
                            trialValues.const_slice(trialDof, point)) *
                        geomData.integrationElements(point) *
                        weights[point];
            result(testDof, trialDof) = sum;
        }
}

} // namespace Fiber

#endif