| // The template and inlines for the -*- C++ -*- mask_array class. |
| |
| // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2009, 2010 |
| // 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; |
| |
| // not implemented |
| mask_array(); |
| }; |
| |
| 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); } |
| |
| #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 |
| |
| // @} group numeric_arrays |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace |
| |
| #endif /* _MASK_ARRAY_H */ |
