DUNE-FEM (unstable)

default.hh
1#ifndef DUNE_FEM_HPDG_SPACE_COMMON_DATAPROJECTION_DEFAULT_HH
2#define DUNE_FEM_HPDG_SPACE_COMMON_DATAPROJECTION_DEFAULT_HH
3
4#include <cassert>
5#include <cstddef>
6
7#include <functional>
8#include <vector>
9
11
12#include <dune/fem/function/localfunction/localfunction.hh>
13#include <dune/fem/function/localfunction/const.hh>
14#include <dune/fem/function/localfunction/mutable.hh>
15#include <dune/fem/space/common/localinterpolation.hh>
16
17#include "dataprojection.hh"
18
19namespace Dune
20{
21
22 namespace Fem
23 {
24
25 namespace hpDG
26 {
27
28 // DefaultDataProjection
29 // ---------------------
30
37 template< class DiscreteFunction >
39 : public DataProjection< typename DiscreteFunction::DiscreteFunctionSpaceType, DefaultDataProjection< DiscreteFunction > >
40 {
43
44 public:
51
52 private:
53 using RangeFieldType = typename DiscreteFunction::RangeFieldType;
56
57 static const std::size_t localBlockSize = DiscreteFunctionSpaceType::localBlockSize;
58 typedef LocalInterpolation< DiscreteFunctionSpaceType > LocalInterpolationType;
59
60 public:
65 explicit DefaultDataProjection ( DiscreteFunction &discreteFunction )
66 : discreteFunction_( discreteFunction )
67 {
68 discreteFunction_.get().enableDofCompression();
69 }
70
73#ifndef DOXYGEN
74
75 DefaultDataProjection ( const ThisType & ) = delete;
76
77 DefaultDataProjection ( ThisType && ) = default;
78
79 ThisType &operator= ( const ThisType & ) = delete;
80
81 ThisType &operator= ( ThisType && ) = default;
82
83#endif // #ifndef DOXYGEN
84
86 void operator() ( const EntityType &entity,
87 const BasisFunctionSetType &prior,
88 const BasisFunctionSetType &present,
89 const std::vector< std::size_t > &origin,
90 const std::vector< std::size_t > &destination )
91 {
92 LocalFunctionType localFunc( prior );
93 read( origin, localFunc.localDofVector() );
94
95 assert( present.size() == space().basisFunctionSet( entity ).size() );
96 LocalDofVectorType localDofVector( present.size() );
97
98 LocalInterpolationType& ip = this->interpolation();
99 auto guard = bindGuard( ip, entity );
100 ip( localFunc, localDofVector );
101
102 write( destination, localDofVector );
103 }
104
106 template <class TemporaryStorage>
107 void operator () ( TemporaryStorage& tmp )
108 {
109 auto& df = discreteFunction();
110
111 // copy dofs to temporary storage, old order still exists
112 auto dfit = df.dbegin();
113 const auto endtmp = tmp.dend();
114 for( auto it = tmp.dbegin(); it != endtmp; ++it, ++dfit )
115 {
116 assert( dfit != df.dend() );
117 *it = *dfit;
118 }
119
120 ConstLocalFunction< TemporaryStorage > tmpLF( tmp );
122 LocalInterpolationType interpolation( df.space() );
123
124 // interpolate to new space, this can be a
125 // Lagrange interpolation or a L2 projection, both locally
126 const auto end = df.space().end();
127 for( auto it = df.space().begin(); it != end; ++it )
128 {
129 const auto& entity = *it;
130
131 auto tguard = bindGuard( tmpLF, entity );
132 auto lguard = bindGuard( lf, entity );
133
134 // if size is the same we can just copy the dof values
135 if( tmpLF.size() == lf.size() )
136 {
137 lf.assign( tmpLF );
138 }
139 else
140 {
141 auto iguard = bindGuard( interpolation, entity );
142 // otherwise a local interpolation is needed
143 interpolation( tmpLF, lf );
144 }
145 }
146 }
147
149 template< class Communicator >
150 void addToList ( Communicator &comm )
151 {
152 comm.addToList( discreteFunction() );
153 }
154
155 private:
156 template< class LocalDofVector >
157 void read ( const std::vector< std::size_t > &blocks, LocalDofVector &localDofVector ) const
158 {
159 assert( localDofVector.size() == localBlockSize*blocks.size() );
160 std::size_t index = 0;
161 for( auto i : blocks )
162 {
163 const auto block = discreteFunction().block( i );
164 for( std::size_t j = 0; j < localBlockSize; ++j )
165 localDofVector[ index++ ] = (*block)[ j ];
166 }
167 assert( index == localDofVector.size() );
168 }
169
170 template< class LocalDofVector >
171 void write ( const std::vector< std::size_t > &blocks, const LocalDofVector &localDofVector )
172 {
173 assert( localDofVector.size() == localBlockSize*blocks.size() );
174 std::size_t index = 0;
175 for( auto i : blocks )
176 {
177 auto block = discreteFunction().block( i );
178 for( std::size_t j = 0; j < localBlockSize; ++j )
179 (*block)[ j ] = localDofVector[ index++ ];
180 }
181 assert( index == localDofVector.size() );
182 }
183
184 DiscreteFunction &discreteFunction () { return discreteFunction_.get(); }
185
186 const DiscreteFunction &discreteFunction () const { return discreteFunction_.get(); }
187
188 const DiscreteFunctionSpaceType &space () const { return discreteFunction().space(); }
189 LocalInterpolationType& interpolation ()
190 {
191 if( ! interpolation_ )
192 interpolation_.reset( new LocalInterpolationType( space() ) );
193 return *interpolation_;
194 }
195
196
197 std::reference_wrapper< DiscreteFunction > discreteFunction_;
198 std::shared_ptr< LocalInterpolationType > interpolation_;
199 };
200
201 } // namespace hpDG
202
203 // forward types to Fem namespace for convenience
204 using hpDG::DefaultDataProjection;
205
206 } // namespace Fem
207
208} // namespace Dune
209
210#endif // #ifndef DUNE_FEM_HPDG_SPACE_COMMON_DATAPROJECTION_DEFAULT_HH
interface for local functions
Definition: localfunction.hh:77
const LocalDofVectorType & localDofVector() const
return const reference to local Dof Vector
Definition: localfunction.hh:424
void assign(const LocalFunction< BasisFunctionSet, T > &other)
assign all DoFs of this local function
Definition: localfunction.hh:192
SizeType size() const
obtain the number of local DoFs
Definition: localfunction.hh:369
Definition: mutable.hh:31
Abstract definition of the local restriction and prolongation of discrete functions.
Definition: dataprojection.hh:29
typename BasisFunctionSetType::EntityType EntityType
entity type
Definition: dataprojection.hh:38
DiscreteFunctionSpace DiscreteFunctionSpaceType
discrete function space type
Definition: dataprojection.hh:34
typename DiscreteFunctionSpaceType::BasisFunctionSetType BasisFunctionSetType
basis function set type
Definition: dataprojection.hh:36
Local -projection for the restriction and prolongation of discrete functions.
Definition: default.hh:40
void addToList(Communicator &comm)
()
Definition: default.hh:150
typename BaseType::DiscreteFunctionSpaceType DiscreteFunctionSpaceType
discrete function space type
Definition: default.hh:46
typename BaseType::EntityType EntityType
entity type
Definition: default.hh:50
typename BaseType::BasisFunctionSetType BasisFunctionSetType
basis function set type
Definition: default.hh:48
void operator()(const EntityType &entity, const BasisFunctionSetType &prior, const BasisFunctionSetType &present, const std::vector< std::size_t > &origin, const std::vector< std::size_t > &destination)
Definition: default.hh:86
This file implements a dense vector with a dynamic size.
Dune namespace.
Definition: alignedallocator.hh:13
constexpr std::integral_constant< std::size_t, sizeof...(II)> size(std::integer_sequence< T, II... >)
Return the size of the sequence.
Definition: integersequence.hh:75
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