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Edit: mask_array.h
// The template and inlines for the -*- C++ -*- mask_array class. // Copyright (C) 1997-2021 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/mask_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 _MASK_ARRAY_H #define _MASK_ARRAY_H 1 #pragma GCC system_header namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @addtogroup numeric_arrays * @{ */ /** * @brief Reference to selected subset of an array. * * A mask_array is a reference to the actual elements of an array specified * by a bitmask in the form of an array of bool. The way to get a * mask_array is to call operator[](valarray<bool>) on a valarray. The * returned mask_array then permits carrying operations out on the * referenced subset of elements in the original valarray. * * For example, if a mask_array is obtained using the array (false, true, * false, true) as an argument, the mask array has two elements referring * to array[1] and array[3] in the underlying array. * * @param Tp Element type. */ template <class _Tp> class mask_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. mask_array (const mask_array&); /// Assignment operator. Assigns elements to corresponding elements /// of @a a. mask_array& operator=(const mask_array&); 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; // ~mask_array (); 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: mask_array(_Array<_Tp>, size_t, _Array<bool>); friend class valarray<_Tp>; const size_t _M_sz; const _Array<bool> _M_mask; const _Array<_Tp> _M_array; #if __cplusplus < 201103L // not implemented mask_array(); #else public: mask_array() = delete; #endif }; template<typename _Tp> inline mask_array<_Tp>::mask_array(const mask_array<_Tp>& __a) : _M_sz(__a._M_sz), _M_mask(__a._M_mask), _M_array(__a._M_array) {} template<typename _Tp> inline mask_array<_Tp>::mask_array(_Array<_Tp> __a, size_t __s, _Array<bool> __m) : _M_sz(__s), _M_mask(__m), _M_array(__a) {} template<typename _Tp> inline mask_array<_Tp>& mask_array<_Tp>::operator=(const mask_array<_Tp>& __a) { std::__valarray_copy(__a._M_array, __a._M_mask, _M_sz, _M_array, _M_mask); return *this; } template<typename _Tp> inline void mask_array<_Tp>::operator=(const _Tp& __t) const { std::__valarray_fill(_M_array, _M_sz, _M_mask, __t); } template<typename _Tp> inline void mask_array<_Tp>::operator=(const valarray<_Tp>& __v) const { std::__valarray_copy(_Array<_Tp>(__v), __v.size(), _M_array, _M_mask); } template<typename _Tp> template<class _Ex> inline void mask_array<_Tp>::operator=(const _Expr<_Ex, _Tp>& __e) const { std::__valarray_copy(__e, __e.size(), _M_array, _M_mask); } /// @cond undocumented #undef _DEFINE_VALARRAY_OPERATOR #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ template<typename _Tp> \ inline void \ mask_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ { \ _Array_augmented_##_Name(_M_array, _M_mask, \ _Array<_Tp>(__v), __v.size()); \ } \ \ template<typename _Tp> \ template<class _Dom> \ inline void \ mask_array<_Tp>::operator _Op##=(const _Expr<_Dom, _Tp>& __e) const\ { \ _Array_augmented_##_Name(_M_array, _M_mask, __e, __e.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 /// @endcond /// @} group numeric_arrays _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif /* _MASK_ARRAY_H */