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muSpectre/src/common/field_collection_global.hh
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field_collection_global.hh
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/**
* @file field_collection_global.hh
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 05 Nov 2017
*
* @brief FieldCollection base-class for global 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_GLOBAL_H
#define FIELD_COLLECTION_GLOBAL_H
#include "common/field_collection_base.hh"
#include "common/ccoord_operations.hh"
namespace muSpectre {
/* ---------------------------------------------------------------------- */
/** `GlobalFieldCollection` derives from `FieldCollectionBase` and stores
* global fields that live throughout the whole computational domain, i.e.
* are defined for each pixel.
*/
template<Dim_t DimS>
class GlobalFieldCollection:
public FieldCollectionBase<DimS, GlobalFieldCollection<DimS>>
{
public:
using Parent = FieldCollectionBase
<DimS, GlobalFieldCollection<DimS>>; //!< base class
using Ccoord = typename Parent::Ccoord; //!< cell coordinates type
using Field_p = typename Parent::Field_p; //!< spatial coordinates type
//! iterator over all pixels contained it the collection
using iterator = typename CcoordOps::Pixels<DimS>::iterator;
//! Default constructor
GlobalFieldCollection();
//! Copy constructor
GlobalFieldCollection(const GlobalFieldCollection &other) = delete;
//! Move constructor
GlobalFieldCollection
(GlobalFieldCollection &&other) = default;
//! Destructor
virtual ~GlobalFieldCollection() = default;
//! Copy assignment operator
GlobalFieldCollection&
operator=(const GlobalFieldCollection &other) = delete;
//! Move assignment operator
GlobalFieldCollection&
operator=(GlobalFieldCollection &&other) = default;
/** allocate memory, etc. At this point, the collection is
informed aboud the size and shape of the domain (through the
sizes parameter). 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'
(if standard strides apply) any field of a different size is
wrong.
TODO: check whether it makes sense to put a runtime check here
**/
inline void initialise(Ccoord sizes);
//! return the pixel sizes
inline const Ccoord & get_sizes() const;
//! 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;
inline iterator begin(); //!< returns iterator to first pixel
inline iterator end(); //!< returns iterator past the last pixel
//! return spatial dimension (template parameter)
static constexpr inline Dim_t spatial_dim() {return DimS;}
protected:
//! number of discretisation cells in each of the DimS spatial directions
Ccoord sizes{};
CcoordOps::Pixels<DimS> pixels{}; //!< helper to iterate over the grid
private:
};
/* ---------------------------------------------------------------------- */
template <Dim_t DimS>
GlobalFieldCollection<DimS>::GlobalFieldCollection()
:Parent()
{}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS>
void GlobalFieldCollection<DimS>::
initialise(Ccoord sizes) {
if (this->is_initialised) {
throw std::runtime_error("double initialisation");
}
this->pixels = CcoordOps::Pixels<DimS>(sizes);
this->size_ = CcoordOps::get_size(sizes);
this->sizes = sizes;
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;
}
//----------------------------------------------------------------------------//
//! return the pixel sizes
template <Dim_t DimS>
const typename GlobalFieldCollection<DimS>::Ccoord &
GlobalFieldCollection<DimS>::get_sizes() const {
return this->sizes;
}
//----------------------------------------------------------------------------//
//! returns the cell coordinates corresponding to a linear index
template <Dim_t DimS>
typename GlobalFieldCollection<DimS>::Ccoord
GlobalFieldCollection<DimS>::get_ccoord(size_t index) const {
return CcoordOps::get_ccoord(this->get_sizes(), std::move(index));
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS>
typename GlobalFieldCollection<DimS>::iterator
GlobalFieldCollection<DimS>::begin() {
return this->pixels.begin();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS>
typename GlobalFieldCollection<DimS>::iterator
GlobalFieldCollection<DimS>::end() {
return this->pixels.end();
}
//----------------------------------------------------------------------------//
//! returns the linear index corresponding to cell coordinates
template <Dim_t DimS>
template <class CcoordRef>
size_t
GlobalFieldCollection<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 CcoordOps::get_index(this->get_sizes(),
std::forward<CcoordRef>(ccoord));
}
} // muSpectre
#endif /* FIELD_COLLECTION_GLOBAL_H */
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