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field_base.hh
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/**
* file field_base.hh
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 10 Apr 2018
*
* @brief Virtual base class for fields
*
* @section LICENSE
*
* Copyright © 2018 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_BASE_H
#define FIELD_BASE_H
#include <string>
#include <stdexcept>
namespace muSpectre {
/* ---------------------------------------------------------------------- */
/**
* base class for field collection-related exceptions
*/
class FieldCollectionError: public std::runtime_error {
public:
//! constructor
explicit FieldCollectionError(const std::string& what)
:std::runtime_error(what){}
//! constructor
explicit FieldCollectionError(const char * what)
:std::runtime_error(what){}
};
/// base class for field-related exceptions
class FieldError: public FieldCollectionError {
using Parent = FieldCollectionError;
public:
//! constructor
explicit FieldError(const std::string& what)
:Parent(what){}
//! constructor
explicit FieldError(const char * what)
:Parent(what){}
};
/**
* Thrown when a associating a field map to and incompatible field
* is attempted
*/
class FieldInterpretationError: public FieldError
{
public:
//! constructor
explicit FieldInterpretationError(const std::string & what)
:FieldError(what){}
//! constructor
explicit FieldInterpretationError(const char * what)
:FieldError(what){}
};
namespace internal{
/* ---------------------------------------------------------------------- */
/**
* Virtual base class for all fields. A field represents
* meta-information for the per-pixel storage for a scalar, vector
* or tensor quantity and is therefore the abstract class defining
* the field. It is used for type and size checking at runtime and
* for storage of polymorphic pointers to fully typed and sized
* fields. `FieldBase` (and its children) are templated with a
* specific `FieldCollection` (derived from
* `muSpectre::FieldCollectionBase`). A `FieldCollection` stores
* multiple fields that all apply to the same set of
* pixels. Addressing and managing the data for all pixels is
* handled by the `FieldCollection`. Note that `FieldBase` does
* not know anything about about mathematical operations on the
* data or how to iterate over all pixels. Mapping the raw data
* onto for instance Eigen maps and iterating over those is
* handled by the `FieldMap`.
*/
template <class FieldCollection>
class FieldBase
{
protected:
//! constructor
//! unique name (whithin Collection)
//! number of components
//! collection to which this field belongs (eg, material, cell)
FieldBase(std::string unique_name,
size_t nb_components,
FieldCollection & collection);
public:
using collection_t = FieldCollection; //!< for type checks
//! Copy constructor
FieldBase(const FieldBase &other) = delete;
//! Move constructor
FieldBase(FieldBase &&other) = delete;
//! Destructor
virtual ~FieldBase() = default;
//! Copy assignment operator
FieldBase& operator=(const FieldBase &other) = delete;
//! Move assignment operator
FieldBase& operator=(FieldBase &&other) = delete;
/* ---------------------------------------------------------------------- */
//!Identifying accessors
//! return field name
inline const std::string & get_name() const;
//! return field type
//inline const Field_t & get_type() const;
//! return my collection (for iterating)
inline const FieldCollection & get_collection() const;
//! return my collection (for iterating)
inline const size_t & get_nb_components() const;
//! return type_id of stored type
virtual const std::type_info & get_stored_typeid() const = 0;
//! number of pixels in the field
virtual size_t size() const = 0;
//! add a pad region to the end of the field buffer; required for
//! using this as e.g. an FFT workspace
virtual void set_pad_size(size_t pad_size_) = 0;
//! pad region size
virtual size_t get_pad_size() const {return this->pad_size;};
//! initialise field to zero (do more complicated initialisations through
//! fully typed maps)
virtual void set_zero() = 0;
//! give access to collections
friend FieldCollection;
//! give access to collection's base class
friend typename FieldCollection::Parent;
protected:
/* ---------------------------------------------------------------------- */
//! allocate memory etc
virtual void resize(size_t size) = 0;
const std::string name; //!< the field's unique name
const size_t nb_components; //!< number of components per entry
//! reference to the collection this field belongs to
const FieldCollection & collection;
size_t pad_size; //!< size of padding region at end of buffer
private:
};
/* ---------------------------------------------------------------------- */
// Implementations
/* ---------------------------------------------------------------------- */
template <class FieldCollection>
FieldBase<FieldCollection>::FieldBase(std::string unique_name,
size_t nb_components_,
FieldCollection & collection_)
:name(unique_name), nb_components(nb_components_),
collection(collection_), pad_size{0} {}
/* ---------------------------------------------------------------------- */
template <class FieldCollection>
inline const std::string & FieldBase<FieldCollection>::get_name() const {
return this->name;
}
/* ---------------------------------------------------------------------- */
template <class FieldCollection>
inline const FieldCollection & FieldBase<FieldCollection>::
get_collection() const {
return this->collection;
}
/* ---------------------------------------------------------------------- */
template <class FieldCollection>
inline const size_t & FieldBase<FieldCollection>::
get_nb_components() const {
return this->nb_components;
}
} // internal
} // muSpectre
#endif /* FIELD_BASE_H */

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