213 lines
7.7 KiB
C++
213 lines
7.7 KiB
C++
// The template and inlines for the -*- C++ -*- indirect_array class.
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// Copyright (C) 1997-2016 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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// 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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// 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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/** @file bits/indirect_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 _INDIRECT_ARRAY_H
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#define _INDIRECT_ARRAY_H 1
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#pragma GCC system_header
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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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* @addtogroup numeric_arrays
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* @{
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*/
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/**
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* @brief Reference to arbitrary subset of an array.
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*
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* An indirect_array is a reference to the actual elements of an array
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* specified by an ordered array of indices. The way to get an
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* indirect_array is to call operator[](valarray<size_t>) on a valarray.
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* The returned indirect_array then permits carrying operations out on the
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* referenced subset of elements in the original valarray.
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*
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* For example, if an indirect_array is obtained using the array (4,2,0) as
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* an argument, and then assigned to an array containing (1,2,3), then the
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* underlying array will have array[0]==3, array[2]==2, and array[4]==1.
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*
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* @param Tp Element type.
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*/
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template <class _Tp>
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class indirect_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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/// Copy constructor. Both slices refer to the same underlying array.
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indirect_array(const indirect_array&);
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/// Assignment operator. Assigns elements to corresponding elements
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/// of @a a.
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indirect_array& operator=(const indirect_array&);
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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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// ~indirect_array();
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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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/// Copy constructor. Both slices refer to the same underlying array.
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indirect_array(_Array<_Tp>, size_t, _Array<size_t>);
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friend class valarray<_Tp>;
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friend class gslice_array<_Tp>;
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const size_t _M_sz;
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const _Array<size_t> _M_index;
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const _Array<_Tp> _M_array;
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// not implemented
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indirect_array();
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};
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template<typename _Tp>
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inline
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indirect_array<_Tp>::indirect_array(const indirect_array<_Tp>& __a)
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: _M_sz(__a._M_sz), _M_index(__a._M_index), _M_array(__a._M_array) {}
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template<typename _Tp>
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inline
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indirect_array<_Tp>::indirect_array(_Array<_Tp> __a, size_t __s,
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_Array<size_t> __i)
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: _M_sz(__s), _M_index(__i), _M_array(__a) {}
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template<typename _Tp>
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inline indirect_array<_Tp>&
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indirect_array<_Tp>::operator=(const indirect_array<_Tp>& __a)
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{
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std::__valarray_copy(__a._M_array, _M_sz, __a._M_index, _M_array,
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_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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indirect_array<_Tp>::operator=(const _Tp& __t) const
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{ std::__valarray_fill(_M_array, _M_index, _M_sz, __t); }
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template<typename _Tp>
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inline void
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indirect_array<_Tp>::operator=(const valarray<_Tp>& __v) const
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{ std::__valarray_copy(_Array<_Tp>(__v), _M_sz, _M_array, _M_index); }
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template<typename _Tp>
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template<class _Dom>
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inline void
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indirect_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const
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{ std::__valarray_copy(__e, _M_sz, _M_array, _M_index); }
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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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indirect_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const\
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{ \
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_Array_augmented_##_Name(_M_array, _M_index, _Array<_Tp>(__v), _M_sz); \
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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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indirect_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\
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{ \
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_Array_augmented_##_Name(_M_array, _M_index, __e, _M_sz); \
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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 /* _INDIRECT_ARRAY_H */
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