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// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------
//! \addtogroup subview_field
//! @{
//! Class for storing data required to construct or apply operations to a subfield
//! (i.e. where the subfield starts and ends as well as a reference/pointer to the original field),
template<typename oT>
class subview_field
{
public:
typedef oT object_type;
const field<oT>& f;
const uword aux_row1;
const uword aux_col1;
const uword aux_slice1;
const uword n_rows;
const uword n_cols;
const uword n_slices;
const uword n_elem;
protected:
arma_inline subview_field(const field<oT>& in_f, const uword in_row1, const uword in_col1, const uword in_n_rows, const uword in_n_cols);
arma_inline subview_field(const field<oT>& in_f, const uword in_row1, const uword in_col1, const uword in_slice1, const uword in_n_rows, const uword in_n_cols, const uword in_n_slices);
public:
inline ~subview_field();
inline subview_field() = delete;
inline void operator= (const field<oT>& x);
inline void operator= (const subview_field& x);
arma_inline oT& operator[](const uword i);
arma_inline const oT& operator[](const uword i) const;
arma_inline oT& operator()(const uword i);
arma_inline const oT& operator()(const uword i) const;
arma_inline oT& at(const uword row, const uword col);
arma_inline const oT& at(const uword row, const uword col) const;
arma_inline oT& at(const uword row, const uword col, const uword slice);
arma_inline const oT& at(const uword row, const uword col, const uword slice) const;
arma_inline oT& operator()(const uword row, const uword col);
arma_inline const oT& operator()(const uword row, const uword col) const;
arma_inline oT& operator()(const uword row, const uword col, const uword slice);
arma_inline const oT& operator()(const uword row, const uword col, const uword slice) const;
arma_inline bool is_empty() const;
inline bool check_overlap(const subview_field& x) const;
inline void print(const std::string extra_text = "") const;
inline void print(std::ostream& user_stream, const std::string extra_text = "") const;
template<typename functor> inline void for_each(functor F);
template<typename functor> inline void for_each(functor F) const;
inline void fill(const oT& x);
inline static void extract(field<oT>& out, const subview_field& in);
friend class field<oT>;
};
//! @}
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