Edit: gslice_array.h
// The template and inlines for the -*- C++ -*- gslice_array class. // Copyright (C) 1997-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library 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. // This library 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. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file bits/gslice_array.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{valarray} */ // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr> #ifndef _GSLICE_ARRAY_H #define _GSLICE_ARRAY_H 1 #pragma GCC system_header namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @addtogroup numeric_arrays * @{ */ /** * @brief Reference to multi-dimensional subset of an array. * * A gslice_array is a reference to the actual elements of an array * specified by a gslice. The way to get a gslice_array is to call * operator[](gslice) on a valarray. The returned gslice_array then * permits carrying operations out on the referenced subset of elements in * the original valarray. For example, operator+=(valarray) will add * values to the subset of elements in the underlying valarray this * gslice_array refers to. * * @param Tp Element type. */ template<typename _Tp> class gslice_array { public: typedef _Tp value_type; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 253. valarray helper functions are almost entirely useless /// Copy constructor. Both slices refer to the same underlying array. gslice_array(const gslice_array&); /// Assignment operator. Assigns slice elements to corresponding /// elements of @a a. gslice_array& operator=(const gslice_array&); /// Assign slice elements to corresponding elements of @a v. void operator=(const valarray<_Tp>&) const; /// Multiply slice elements by corresponding elements of @a v. void operator*=(const valarray<_Tp>&) const; /// Divide slice elements by corresponding elements of @a v. void operator/=(const valarray<_Tp>&) const; /// Modulo slice elements by corresponding elements of @a v. void operator%=(const valarray<_Tp>&) const; /// Add corresponding elements of @a v to slice elements. void operator+=(const valarray<_Tp>&) const; /// Subtract corresponding elements of @a v from slice elements. void operator-=(const valarray<_Tp>&) const; /// Logical xor slice elements with corresponding elements of @a v. void operator^=(const valarray<_Tp>&) const; /// Logical and slice elements with corresponding elements of @a v. void operator&=(const valarray<_Tp>&) const; /// Logical or slice elements with corresponding elements of @a v. void operator|=(const valarray<_Tp>&) const; /// Left shift slice elements by corresponding elements of @a v. void operator<<=(const valarray<_Tp>&) const; /// Right shift slice elements by corresponding elements of @a v. void operator>>=(const valarray<_Tp>&) const; /// Assign all slice elements to @a t. void operator=(const _Tp&) const; template<class _Dom> void operator=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator*=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator/=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator%=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator+=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator-=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator^=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator&=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator|=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator<<=(const _Expr<_Dom, _Tp>&) const; template<class _Dom> void operator>>=(const _Expr<_Dom, _Tp>&) const; private: _Array<_Tp> _M_array; const valarray<size_t>& _M_index; friend class valarray<_Tp>; gslice_array(_Array<_Tp>, const valarray<size_t>&); // not implemented gslice_array(); }; template<typename _Tp> inline gslice_array<_Tp>::gslice_array(_Array<_Tp> __a, const valarray<size_t>& __i) : _M_array(__a), _M_index(__i) {} template<typename _Tp> inline gslice_array<_Tp>::gslice_array(const gslice_array<_Tp>& __a) : _M_array(__a._M_array), _M_index(__a._M_index) {} template<typename _Tp> inline gslice_array<_Tp>& gslice_array<_Tp>::operator=(const gslice_array<_Tp>& __a) { std::__valarray_copy(_Array<_Tp>(__a._M_array), _Array<size_t>(__a._M_index), _M_index.size(), _M_array, _Array<size_t>(_M_index)); return *this; } template<typename _Tp> inline void gslice_array<_Tp>::operator=(const _Tp& __t) const { std::__valarray_fill(_M_array, _Array<size_t>(_M_index), _M_index.size(), __t); } template<typename _Tp> inline void gslice_array<_Tp>::operator=(const valarray<_Tp>& __v) const { std::__valarray_copy(_Array<_Tp>(__v), __v.size(), _M_array, _Array<size_t>(_M_index)); } template<typename _Tp> template<class _Dom> inline void gslice_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const { std::__valarray_copy (__e, _M_index.size(), _M_array, _Array<size_t>(_M_index)); } #undef _DEFINE_VALARRAY_OPERATOR #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ template<typename _Tp> \ inline void \ gslice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ { \ _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), \ _Array<_Tp>(__v), __v.size()); \ } \ \ template<typename _Tp> \ template<class _Dom> \ inline void \ gslice_array<_Tp>::operator _Op##= (const _Expr<_Dom, _Tp>& __e) const\ { \ _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), __e,\ _M_index.size()); \ } _DEFINE_VALARRAY_OPERATOR(*, __multiplies) _DEFINE_VALARRAY_OPERATOR(/, __divides) _DEFINE_VALARRAY_OPERATOR(%, __modulus) _DEFINE_VALARRAY_OPERATOR(+, __plus) _DEFINE_VALARRAY_OPERATOR(-, __minus) _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) #undef _DEFINE_VALARRAY_OPERATOR // @} group numeric_arrays _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif /* _GSLICE_ARRAY_H */
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