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// The template and inlines for the -*- C++ -*- gslice_array class. |
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// Copyright (C) 1997-2021 Free Software Foundation, Inc. |
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// |
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// This file is part of the GNU ISO C++ Library. This library is free |
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// software; you can redistribute it and/or modify it under the |
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// terms of the GNU General Public License as published by the |
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// Free Software Foundation; either version 3, or (at your option) |
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// any later version. |
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|
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// This library is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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|
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// Under Section 7 of GPL version 3, you are granted additional |
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// permissions described in the GCC Runtime Library Exception, version |
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// 3.1, as published by the Free Software Foundation. |
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// You should have received a copy of the GNU General Public License and |
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// a copy of the GCC Runtime Library Exception along with this program; |
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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// <http://www.gnu.org/licenses/>. |
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|
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/** @file bits/gslice_array.h |
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* This is an internal header file, included by other library headers. |
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* Do not attempt to use it directly. @headername{valarray} |
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*/ |
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// Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr> |
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#ifndef _GSLICE_ARRAY_H |
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#define _GSLICE_ARRAY_H 1 |
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#pragma GCC system_header |
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|
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namespace std _GLIBCXX_VISIBILITY(default) |
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{ |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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|
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/** |
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* @addtogroup numeric_arrays |
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* @{ |
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*/ |
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/** |
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* @brief Reference to multi-dimensional subset of an array. |
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* |
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* A gslice_array is a reference to the actual elements of an array |
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* specified by a gslice. The way to get a gslice_array is to call |
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* operator[](gslice) on a valarray. The returned gslice_array then |
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* permits carrying operations out on the referenced subset of elements in |
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* the original valarray. For example, operator+=(valarray) will add |
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* values to the subset of elements in the underlying valarray this |
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* gslice_array refers to. |
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* |
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* @param Tp Element type. |
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*/ |
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template<typename _Tp> |
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class gslice_array |
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{ |
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public: |
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typedef _Tp value_type; |
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// _GLIBCXX_RESOLVE_LIB_DEFECTS |
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// 253. valarray helper functions are almost entirely useless |
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|
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/// Copy constructor. Both slices refer to the same underlying array. |
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gslice_array(const gslice_array&); |
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/// Assignment operator. Assigns slice elements to corresponding |
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/// elements of @a a. |
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gslice_array& operator=(const gslice_array&); |
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|
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/// Assign slice elements to corresponding elements of @a v. |
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void operator=(const valarray<_Tp>&) const; |
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/// Multiply slice elements by corresponding elements of @a v. |
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void operator*=(const valarray<_Tp>&) const; |
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/// Divide slice elements by corresponding elements of @a v. |
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void operator/=(const valarray<_Tp>&) const; |
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/// Modulo slice elements by corresponding elements of @a v. |
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void operator%=(const valarray<_Tp>&) const; |
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/// Add corresponding elements of @a v to slice elements. |
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void operator+=(const valarray<_Tp>&) const; |
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/// Subtract corresponding elements of @a v from slice elements. |
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void operator-=(const valarray<_Tp>&) const; |
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/// Logical xor slice elements with corresponding elements of @a v. |
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void operator^=(const valarray<_Tp>&) const; |
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/// Logical and slice elements with corresponding elements of @a v. |
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void operator&=(const valarray<_Tp>&) const; |
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/// Logical or slice elements with corresponding elements of @a v. |
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void operator|=(const valarray<_Tp>&) const; |
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/// Left shift slice elements by corresponding elements of @a v. |
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void operator<<=(const valarray<_Tp>&) const; |
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/// Right shift slice elements by corresponding elements of @a v. |
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void operator>>=(const valarray<_Tp>&) const; |
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/// Assign all slice elements to @a t. |
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void operator=(const _Tp&) const; |
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|
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template<class _Dom> |
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void operator=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator*=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator/=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator%=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator+=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator-=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator^=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator&=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator|=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator<<=(const _Expr<_Dom, _Tp>&) const; |
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template<class _Dom> |
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void operator>>=(const _Expr<_Dom, _Tp>&) const; |
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private: |
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_Array<_Tp> _M_array; |
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const valarray<size_t>& _M_index; |
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|
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friend class valarray<_Tp>; |
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gslice_array(_Array<_Tp>, const valarray<size_t>&); |
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#if __cplusplus < 201103L |
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// not implemented |
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gslice_array(); |
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#else |
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public: |
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gslice_array() = delete; |
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#endif |
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}; |
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template<typename _Tp> |
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inline |
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gslice_array<_Tp>::gslice_array(_Array<_Tp> __a, |
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const valarray<size_t>& __i) |
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: _M_array(__a), _M_index(__i) {} |
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template<typename _Tp> |
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inline |
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gslice_array<_Tp>::gslice_array(const gslice_array<_Tp>& __a) |
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: _M_array(__a._M_array), _M_index(__a._M_index) {} |
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template<typename _Tp> |
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inline gslice_array<_Tp>& |
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gslice_array<_Tp>::operator=(const gslice_array<_Tp>& __a) |
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{ |
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std::__valarray_copy(_Array<_Tp>(__a._M_array), |
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_Array<size_t>(__a._M_index), _M_index.size(), |
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_M_array, _Array<size_t>(_M_index)); |
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return *this; |
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} |
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template<typename _Tp> |
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inline void |
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gslice_array<_Tp>::operator=(const _Tp& __t) const |
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{ |
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std::__valarray_fill(_M_array, _Array<size_t>(_M_index), |
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_M_index.size(), __t); |
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} |
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template<typename _Tp> |
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inline void |
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gslice_array<_Tp>::operator=(const valarray<_Tp>& __v) const |
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{ |
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std::__valarray_copy(_Array<_Tp>(__v), __v.size(), |
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_M_array, _Array<size_t>(_M_index)); |
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} |
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template<typename _Tp> |
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template<class _Dom> |
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inline void |
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gslice_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const |
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{ |
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std::__valarray_copy (__e, _M_index.size(), _M_array, |
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_Array<size_t>(_M_index)); |
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} |
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#undef _DEFINE_VALARRAY_OPERATOR |
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#define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ |
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template<typename _Tp> \ |
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inline void \ |
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gslice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ |
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{ \ |
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_Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), \ |
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_Array<_Tp>(__v), __v.size()); \ |
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} \ |
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\ |
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template<typename _Tp> \ |
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template<class _Dom> \ |
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inline void \ |
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gslice_array<_Tp>::operator _Op##= (const _Expr<_Dom, _Tp>& __e) const\ |
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{ \ |
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_Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), __e,\ |
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_M_index.size()); \ |
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} |
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_DEFINE_VALARRAY_OPERATOR(*, __multiplies) |
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_DEFINE_VALARRAY_OPERATOR(/, __divides) |
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_DEFINE_VALARRAY_OPERATOR(%, __modulus) |
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_DEFINE_VALARRAY_OPERATOR(+, __plus) |
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_DEFINE_VALARRAY_OPERATOR(-, __minus) |
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_DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) |
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_DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) |
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_DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) |
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_DEFINE_VALARRAY_OPERATOR(<<, __shift_left) |
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_DEFINE_VALARRAY_OPERATOR(>>, __shift_right) |
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#undef _DEFINE_VALARRAY_OPERATOR |
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/// @} group numeric_arrays |
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace |
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#endif /* _GSLICE_ARRAY_H */ |
