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field_map_scalar.hh
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/**
* file field_map_scalar.hh
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 26 Sep 2017
*
* @brief maps over scalar fields
*
* @section LICENCE
*
* 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_MAP_SCALAR_H
#define FIELD_MAP_SCALAR_H
#include "common/field_map_base.hh"
namespace muSpectre {
template <class FieldCollection, typename T, bool ConstField=false>
class ScalarFieldMap
: public internal::FieldMap<FieldCollection, T, 1, ConstField>
{
public:
using parent = internal::FieldMap<FieldCollection, T, 1, ConstField>;
using Ccoord = Ccoord_t<FieldCollection::spatial_dim()>;
using value_type = T;
using const_reference = const value_type &;
using reference = std::conditional_t<ConstField,
const_reference,
value_type &>;
using size_type = typename parent::size_type;
using pointer = T*;
using Field = typename parent::Field;
using const_iterator= typename parent::template iterator<ScalarFieldMap, true>;
using iterator = std::conditional_t
<ConstField,
const_iterator,
typename parent::template iterator<ScalarFieldMap>>;
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
friend iterator;
//! Default constructor
ScalarFieldMap() = delete;
template <bool isntConst=!ConstField>
ScalarFieldMap(std::enable_if_t<isntConst, Field &> field);
template <bool isConst=ConstField>
ScalarFieldMap(std::enable_if_t<isConst, const Field &> field);
//! Copy constructor
ScalarFieldMap(const ScalarFieldMap &other) = default;
//! Move constructor
ScalarFieldMap(ScalarFieldMap &&other) noexcept = default;
//! Destructor
virtual ~ScalarFieldMap() noexcept = default;
//! Copy assignment operator
ScalarFieldMap& operator=(const ScalarFieldMap &other) = delete;
//! Move assignment operator
ScalarFieldMap& operator=(ScalarFieldMap &&other) noexcept = delete;
//! Assign a value to every entry
ScalarFieldMap& operator=(T val);
//! give human-readable field map type
inline std::string info_string() const override final;
//! member access
inline reference operator[](size_type index);
inline reference operator[](const Ccoord& ccoord);
inline const_reference operator[] (size_type index) const;
inline const_reference operator[] (const Ccoord& ccoord) const;
//! return an iterator to head of field for ranges
inline iterator begin(){return iterator(*this);}
inline const_iterator cbegin() const {return const_iterator(*this);}
inline const_iterator begin() const {return this->cbegin();}
//! return an iterator to tail of field for ranges
inline iterator end(){return iterator(*this, false);}
inline const_iterator cend() const {return const_iterator(*this, false);}
inline const_iterator end() const {return this->cend();}
inline T mean() const;
protected:
//! for sad, legacy iterator use
inline pointer ptr_to_val_t(size_type index);
const static std::string field_info_root;
private:
};
/* ---------------------------------------------------------------------- */
template <class FieldCollection, typename T, bool ConstField>
template <bool isntConst>
ScalarFieldMap<FieldCollection, T, ConstField>::
ScalarFieldMap(std::enable_if_t<isntConst, Field &> field)
:parent(field) {
static_assert((isntConst != ConstField),
"let the compiler deduce isntConst, this is a SFINAE "
"parameter");
this->check_compatibility();
}
/* ---------------------------------------------------------------------- */
template <class FieldCollection, typename T, bool ConstField>
template <bool isConst>
ScalarFieldMap<FieldCollection, T, ConstField>::
ScalarFieldMap(std::enable_if_t<isConst, const Field &> field)
:parent(field) {
static_assert((isConst == ConstField),
"let the compiler deduce isntConst, this is a SFINAE "
"parameter");
this->check_compatibility();
}
/* ---------------------------------------------------------------------- */
//! human-readable field map type
template<class FieldCollection, typename T, bool ConstField>
std::string
ScalarFieldMap<FieldCollection, T, ConstField>::info_string() const {
std::stringstream info;
info << "Scalar(" << typeid(T).name() << ")";
return info.str();
}
/* ---------------------------------------------------------------------- */
template <class FieldCollection, typename T, bool ConstField>
const std::string ScalarFieldMap<FieldCollection, T, ConstField>::field_info_root{
"Scalar"};
/* ---------------------------------------------------------------------- */
//! member access
template <class FieldCollection, typename T, bool ConstField>
typename ScalarFieldMap<FieldCollection, T, ConstField>::reference
ScalarFieldMap<FieldCollection, T, ConstField>::operator[](size_type index) {
return this->get_ptr_to_entry(std::move(index))[0];
}
/* ---------------------------------------------------------------------- */
//! member access
template <class FieldCollection, typename T, bool ConstField>
typename ScalarFieldMap<FieldCollection, T, ConstField>::reference
ScalarFieldMap<FieldCollection, T, ConstField>::operator[](const Ccoord& ccoord) {
auto && index = this->collection.get_index(std::move(ccoord));
return this->get_ptr_to_entry(std::move(index))[0];
}
/* ---------------------------------------------------------------------- */
//! member access
template <class FieldCollection, typename T, bool ConstField>
typename ScalarFieldMap<FieldCollection, T, ConstField>::const_reference
ScalarFieldMap<FieldCollection, T, ConstField>::
operator[](size_type index) const {
return this->get_ptr_to_entry(std::move(index))[0];
}
/* ---------------------------------------------------------------------- */
//! member access
template <class FieldCollection, typename T, bool ConstField>
typename ScalarFieldMap<FieldCollection, T, ConstField>::const_reference
ScalarFieldMap<FieldCollection, T, ConstField>::
operator[](const Ccoord& ccoord) const {
auto && index = this->collection.get_index(std::move(ccoord));
return this->get_ptr_to_entry(std::move(index))[0];
}
/* ---------------------------------------------------------------------- */
//! Assign a value to every entry
template <class FieldCollection, typename T, bool ConstField>
ScalarFieldMap<FieldCollection, T, ConstField> &
ScalarFieldMap<FieldCollection, T, ConstField>::operator=(T val) {
for (auto & scalar:*this) {
scalar = val;
}
return *this;
}
/* ---------------------------------------------------------------------- */
template <class FieldCollection, typename T, bool ConstField>
T
ScalarFieldMap<FieldCollection, T, ConstField>::
mean() const {
T mean{0};
for (auto && val: *this) {
mean += val;
}
mean /= Real(this->size());
return mean;
}
} // muSpectre
#endif /* FIELD_MAP_SCALAR_H */

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