/usr/include/dune/grid/geometrygrid/iterator.hh is in libdune-grid-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_GEOGRID_ITERATOR_HH
#define DUNE_GEOGRID_ITERATOR_HH
#include <cassert>
#include <type_traits>
#include <utility>
#include <dune/geometry/referenceelements.hh>
#include <dune/grid/common/entitypointer.hh>
#include <dune/grid/geometrygrid/capabilities.hh>
#include <dune/grid/geometrygrid/declaration.hh>
#include <dune/grid/geometrygrid/entity.hh>
namespace Dune
{
namespace GeoGrid
{
// Internal Forward Declarations
// -----------------------------
template< class HostGridView, int codim, PartitionIteratorType pitype, class Grid,
bool fake = !Capabilities::hasHostEntity< Grid, codim >::v >
class Iterator;
template< class Grid >
class HierarchicIterator;
// PartitionIteratorFilter
// -----------------------
template< int codim, PartitionIteratorType pitype, class Grid >
struct PartitionIteratorFilter;
template< int codim, class Grid >
struct PartitionIteratorFilter< codim, Interior_Partition, Grid >
{
static const int dimension = std::remove_const< Grid >::type::dimension;
static const int codimension = codim;
static const PartitionIteratorType Element_Partition = Interior_Partition;
typedef typename std::remove_const< Grid >::type::ctype ctype;
typedef typename std::remove_const< Grid >::type::Traits::template Codim< 0 >::Entity Element;
typedef ReferenceElement< ctype, dimension > RefElement;
static bool apply ( const RefElement &refElement,
const Element &element, int subEntity )
{
const int size = refElement.size( subEntity, codim, dimension );
for( int i = 0; i < size; ++i )
{
const int j = refElement.subEntity( subEntity, codim, i, dimension );
PartitionType type = element.template subEntity< dimension >( j )->partitionType();
if( type == InteriorEntity )
return true;
}
return false;
}
};
template< int codim, class Grid >
struct PartitionIteratorFilter< codim, InteriorBorder_Partition, Grid >
{
static const int dimension = std::remove_const< Grid >::type::dimension;
static const int codimension = codim;
static const PartitionIteratorType Element_Partition = Interior_Partition;
typedef typename std::remove_const< Grid >::type::ctype ctype;
typedef typename std::remove_const< Grid >::type::Traits::template Codim< 0 >::Entity Element;
typedef ReferenceElement< ctype, dimension > RefElement;
static bool apply ( const RefElement &refElement,
const Element &element, int subEntity )
{
return true;
}
};
template< int codim, class Grid >
struct PartitionIteratorFilter< codim, Overlap_Partition, Grid >
{
static const int dimension = std::remove_const< Grid >::type::dimension;
static const int codimension = codim;
static const PartitionIteratorType Element_Partition = Overlap_Partition;
typedef typename std::remove_const< Grid >::type::ctype ctype;
typedef typename std::remove_const< Grid >::type::Traits::template Codim< 0 >::Entity Element;
typedef ReferenceElement< ctype, dimension > RefElement;
static bool apply ( const RefElement &refElement,
const Element &element, int subEntity )
{
if( element.partitionType() == InteriorEntity )
return true;
const int size = refElement.size( subEntity, codim, dimension );
for( int i = 0; i < size; ++i )
{
const int j = refElement.subEntity( subEntity, codim, i, dimension );
PartitionType type = element.template subEntity< dimension >( j )->partitionType();
if( (type == OverlapEntity) || (type == BorderEntity) )
return true;
}
return false;
}
};
template< int codim, class Grid >
struct PartitionIteratorFilter< codim, OverlapFront_Partition, Grid >
{
static const int dimension = std::remove_const< Grid >::type::dimension;
static const int codimension = codim;
static const PartitionIteratorType Element_Partition = Overlap_Partition;
typedef typename std::remove_const< Grid >::type::ctype ctype;
typedef typename std::remove_const< Grid >::type::Traits::template Codim< 0 >::Entity Element;
typedef ReferenceElement< ctype, dimension > RefElement;
static bool apply ( const RefElement &refElement,
const Element &element, int subEntity )
{
return true;
}
};
template< int codim, class Grid >
struct PartitionIteratorFilter< codim, All_Partition, Grid >
{
static const int dimension = std::remove_const< Grid >::type::dimension;
static const int codimension = codim;
static const PartitionIteratorType Element_Partition = All_Partition;
typedef typename std::remove_const< Grid >::type::ctype ctype;
typedef typename std::remove_const< Grid >::type::Traits::template Codim< 0 >::Entity Element;
typedef ReferenceElement< ctype, dimension > RefElement;
static bool apply ( const RefElement &refElement,
const Element &element, int subEntity )
{
return true;
}
};
template< int codim, class Grid >
struct PartitionIteratorFilter< codim, Ghost_Partition, Grid >
{
static const int dimension = std::remove_const< Grid >::type::dimension;
static const int codimension = codim;
static const PartitionIteratorType Element_Partition = Ghost_Partition;
typedef typename std::remove_const< Grid >::type::ctype ctype;
typedef typename std::remove_const< Grid >::type::Traits::template Codim< 0 >::Entity Element;
typedef ReferenceElement< ctype, dimension > RefElement;
static bool apply ( const RefElement &refElement,
const Element &element, int subEntity )
{
const int size = refElement.size( subEntity, codim, dimension );
for( int i = 0; i < size; ++i )
{
const int j = refElement.subEntity( subEntity, codim, i, dimension );
PartitionType type = element.template subEntity< dimension >( j )->partitionType();
if( type == GhostEntity )
return true;
}
return false;
}
};
// Iterator (real)
// ---------------
template< class HostGridView, int codim, PartitionIteratorType pitype, class G >
class Iterator< HostGridView, codim, pitype, G, false >
{
typedef typename std::remove_const< G >::type::Traits Traits;
public:
typedef typename Traits::Grid Grid;
static const int codimension = codim;
typedef typename Traits::template Codim< codimension >::Entity Entity;
static const bool fake = false;
private:
typedef GeoGrid::Entity< codimension, Traits::dimension, G > EntityImpl;
typedef typename HostGridView::template Codim< codim >::template Partition< pitype >::Iterator HostEntityIterator;
public:
Iterator () : grid_( nullptr ) {}
Iterator ( const Grid &grid, HostEntityIterator hostEntityIterator )
: grid_( &grid ),
hostEntityIterator_( std::move( hostEntityIterator ) )
{}
void increment ()
{
++hostEntityIterator_;
}
bool equals ( const Iterator &rhs ) const
{
return hostEntityIterator_ == rhs.hostEntityIterator_;
}
Entity dereference () const
{
return EntityImpl( grid(), *hostEntityIterator_ );
}
int level () const { return hostEntityIterator_.level(); }
const Grid &grid () const
{
assert( grid_ );
return *grid_;
}
static Iterator begin ( const Grid &grid, const HostGridView &hostGridView )
{
HostEntityIterator hostEntityIterator = hostGridView.template begin< codimension, pitype >();
return Iterator( grid, std::move( hostEntityIterator ) );
}
static Iterator end ( const Grid &grid, const HostGridView &hostGridView )
{
HostEntityIterator hostEntityIterator = hostGridView.template end< codimension, pitype >();
return Iterator( grid, std::move( hostEntityIterator ) );
}
operator Dune::DefaultEntityPointer< Entity > () const
{
return Dune::DefaultEntityPointer< Entity >( dereference() );
}
bool equals ( const Dune::DefaultEntityPointer< Entity > &rhs ) const
{
return dereference() == rhs.dereference();
}
private:
const Grid *grid_;
HostEntityIterator hostEntityIterator_;
};
// Iterator (fake)
// ---------------
template< class HostGridView, int codim, PartitionIteratorType pitype, class G >
class Iterator< HostGridView, codim, pitype, G, true >
{
typedef typename std::remove_const< G >::type::Traits Traits;
public:
typedef typename Traits::Grid Grid;
static const int codimension = codim;
typedef typename Traits::template Codim< codimension >::Entity Entity;
private:
typedef GeoGrid::Entity< codimension, Traits::dimension, G > EntityImpl;
typedef PartitionIteratorFilter< codim, pitype, typename HostGridView::Grid > Filter;
typedef typename HostGridView::template Codim< codim >::template Partition< typename Filter::ElementPartition >::Iterator HostElementIterator;
typedef typename HostElementIterator::Entity HostElement;
typedef typename HostGridView::IndexSet HostIndexSet;
public:
Iterator () : grid_( nullptr ), hostIndexSet_( nullptr ), subEntity_( -1 ) {}
Iterator ( const Grid &grid, HostElementIterator hostElementIterator, HostElementIterator hostEnd, const HostIndexSet &hostIndexSet )
: grid_( &grid ),
hostElementIterator_( hostElementIterator ),
hostEnd_( hostEnd ),
subEntity_( -1 ),
hostIndexSet_( &hostIndexSet )
{
if( hostElementIterator_ != hostEnd_ )
{
visited_.resize( hostIndexSet_->size( codimension ), false );
increment();
}
}
void increment ()
{
typedef typename Traits::ctype ctype;
while( hostElementIterator_ != hostEnd_ )
{
const HostElement &hostElement = *hostElementIterator_;
const ReferenceElement< ctype, Traits::dimension > &refElement
= ReferenceElements< ctype, Traits::dimension >::general( hostElement.type() );
++subEntity_;
const int count = refElement.size( codimension );
for( ; subEntity_ < count; ++subEntity_ )
{
if( !Filter::apply( refElement, hostElement, subEntity_ ) )
continue;
const size_t index = hostIndexSet_->subIndex( hostElement, subEntity_, codimension );
if( !visited_[ index ] )
{
visited_[ index ] = true;
return;
}
}
++hostElementIterator_;
subEntity_ = -1;
}
}
bool equals ( const Iterator &rhs ) const
{
return hostElementIterator_ == rhs.hostElementIterator_ && ( hostElementIterator_ == hostEnd_ || subEntity_ == rhs.subEntity_ );
}
Entity dereference () const
{
return EntityImpl( grid(), *hostElementIterator_, subEntity_ );
}
int level () const { return hostElementIterator_.level(); }
const Grid &grid () const
{
assert( grid_ );
return *grid_;
}
static Iterator begin ( const Grid &grid, const HostGridView &hostGridView )
{
HostElementIterator first = hostGridView.template begin< codim, Filter::Element_Partition >();
HostElementIterator last = hostGridView.template begin< codim, Filter::Element_Partition >();
return Iterator( grid, std::move( first ), std::move( last ), hostGridView.indexSet() );
}
static Iterator end ( const Grid &grid, const HostGridView &hostGridView )
{
HostElementIterator last = hostGridView.template begin< codim, Filter::Element_Partition >();
return Iterator( grid, last, last, hostGridView.indexSet() );
}
operator Dune::DefaultEntityPointer< Entity > () const
{
return Dune::DefaultEntityPointer< Entity >( dereference() );
}
bool equals ( const Dune::DefaultEntityPointer< Entity > &rhs ) const
{
return dereference() == rhs.dereference();
}
private:
const Grid *grid_;
HostElementIterator hostElementIterator_, hostEnd_;
int subEntity_;
const HostIndexSet *hostIndexSet_;
std::vector< bool > visited_;
};
// HierarchicIterator
// ------------------
template< class G >
class HierarchicIterator
{
typedef typename std::remove_const< G >::type::Traits Traits;
public:
typedef typename Traits::Grid Grid;
static const int codimension = 0;
typedef typename Traits::template Codim< codimension >::Entity Entity;
private:
typedef GeoGrid::Entity< codimension, Traits::dimension, G > EntityImpl;
typedef typename Grid::HostGrid::HierarchicIterator HostEntityIterator;
public:
HierarchicIterator () : grid_( nullptr ) {}
HierarchicIterator ( const Grid &grid, HostEntityIterator hostEntityIterator )
: grid_( &grid ),
hostEntityIterator_( std::move( hostEntityIterator ) )
{}
void increment ()
{
++hostEntityIterator_;
}
bool equals ( const HierarchicIterator &rhs ) const
{
return hostEntityIterator_ == rhs.hostEntityIterator_;
}
Entity dereference () const
{
return EntityImpl( grid(), *hostEntityIterator_ );
}
int level () const { return hostEntityIterator_.level(); }
const Grid &grid () const
{
assert( grid_ );
return *grid_;
}
operator Dune::DefaultEntityPointer< Entity > () const
{
return Dune::DefaultEntityPointer< Entity >( dereference() );
}
bool equals ( const Dune::DefaultEntityPointer< Entity > &rhs ) const
{
return dereference() == rhs.dereference();
}
private:
const Grid *grid_;
HostEntityIterator hostEntityIterator_;
};
} // namespace GeoGrid
} // namespace Dune
#endif // #ifndef DUNE_GEOGRID_ITERATOR_HH
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