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field_collection_local.hh
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/**
* @file field_collection_local.hh
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 05 Nov 2017
*
* @brief FieldCollection base-class for local fields
*
* Copyright © 2017 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µSpectre is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef FIELD_COLLECTION_LOCAL_H
#define FIELD_COLLECTION_LOCAL_H
#include "common/field_collection_base.hh"
namespace muSpectre {
/* ---------------------------------------------------------------------- */
/** `LocalFieldCollection` derives from `FieldCollectionBase` and stores
* local fields, i.e. fields that are only defined for a subset of all pixels
* in the computational domain. The coordinates of these active pixels are
* explicitly stored by this field collection.
* `LocalFieldCollection::add_pixel` allows to add individual pixels to the
* field collection.
*/
template<Dim_t DimS>
class LocalFieldCollection:
public FieldCollectionBase<DimS, LocalFieldCollection<DimS>>
{
public:
//! for compile time check
constexpr static bool Global{false};
//! base class
using Parent = FieldCollectionBase<DimS,
LocalFieldCollection<DimS>>;
using Ccoord = typename Parent::Ccoord; //!< cell coordinates type
using Field_p = typename Parent::Field_p; //!< field pointer
using ccoords_container = std::vector<Ccoord>; //!< list of pixels
//! iterator over managed pixels
using iterator = typename ccoords_container::iterator;
//! Default constructor
LocalFieldCollection();
//! Copy constructor
LocalFieldCollection(const LocalFieldCollection &other) = delete;
//! Move constructor
LocalFieldCollection(LocalFieldCollection &&other) = delete;
//! Destructor
virtual ~LocalFieldCollection() = default;
//! Copy assignment operator
LocalFieldCollection& operator=(const LocalFieldCollection &other) = delete;
//! Move assignment operator
LocalFieldCollection& operator=(LocalFieldCollection &&other) = delete;
//! add a pixel/voxel to the field collection
inline void add_pixel(const Ccoord & local_ccoord);
/** allocate memory, etc. at this point, the field collection
knows how many entries it should have from the size of the
coords containes (which grows by one every time add_pixel is
called. The job of initialise is to make sure that all fields
are either of size 0, in which case they need to be allocated,
or are of the same size as the product of 'sizes' any field of
a different size is wrong TODO: check whether it makes sense
to put a runtime check here
**/
inline void initialise();
//! returns the linear index corresponding to cell coordinates
template <class CcoordRef>
inline size_t get_index(CcoordRef && ccoord) const;
//! returns the cell coordinates corresponding to a linear index
inline Ccoord get_ccoord(size_t index) const;
//! iterator to first pixel
inline iterator begin() {return this->ccoords.begin();}
//! iterator past last pixel
inline iterator end() {return this->ccoords.end();}
protected:
//! container of pixel coords for non-global collections
ccoords_container ccoords{};
//! container of indices for non-global collections (slow!)
std::map<Ccoord, size_t> indices{};
private:
};
/* ---------------------------------------------------------------------- */
template <Dim_t DimS>
LocalFieldCollection<DimS>::LocalFieldCollection()
:Parent(){}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS>
void LocalFieldCollection<DimS>::
add_pixel(const Ccoord & local_ccoord) {
if (this->is_initialised) {
throw FieldCollectionError
("once a field collection has been initialised, you can't add new "
"pixels.");
}
this->indices[local_ccoord] = this->ccoords.size();
this->ccoords.push_back(local_ccoord);
this->size_++;
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS>
void LocalFieldCollection<DimS>::
initialise() {
if (this->is_initialised) {
throw std::runtime_error("double initialisation");
}
std::for_each(std::begin(this->fields), std::end(this->fields),
[this](auto && item) {
auto && field = *item.second;
const auto field_size = field.size();
if (field_size == 0) {
field.resize(this->size());
} else if (field_size != this->size()) {
std::stringstream err_stream;
err_stream << "Field '" << field.get_name()
<< "' contains " << field_size
<< " entries, but the field collection "
<< "has " << this->size() << " pixels";
throw FieldCollectionError(err_stream.str());
}
});
this->is_initialised = true;
}
//----------------------------------------------------------------------------//
//! returns the linear index corresponding to cell coordinates
template <Dim_t DimS>
template <class CcoordRef>
size_t
LocalFieldCollection<DimS>::get_index(CcoordRef && ccoord) const {
static_assert(std::is_same<
Ccoord,
std::remove_const_t<
std::remove_reference_t<CcoordRef>>>::value,
"can only be called with values or references of Ccoord");
return this->indices.at(std::forward<CcoordRef>(ccoord));
}
//----------------------------------------------------------------------------//
//! returns the cell coordinates corresponding to a linear index
template <Dim_t DimS>
typename LocalFieldCollection<DimS>::Ccoord
LocalFieldCollection<DimS>::get_ccoord(size_t index) const {
return this->ccoords[std::move(index)];
}
} // muSpectre
#endif /* FIELD_COLLECTION_LOCAL_H */

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