source: svn/trunk/newcon3bcm2_21bu/toolchain/include/c++/3.4.2/bits/indirect_array.h

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1// The template and inlines for the -*- C++ -*- indirect_array class.
2
3// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004
4//  Free Software Foundation, Inc.
5//
6// This file is part of the GNU ISO C++ Library.  This library is free
7// software; you can redistribute it and/or modify it under the
8// terms of the GNU General Public License as published by the
9// Free Software Foundation; either version 2, or (at your option)
10// any later version.
11
12// This library is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU General Public License for more details.
16
17// You should have received a copy of the GNU General Public License along
18// with this library; see the file COPYING.  If not, write to the Free
19// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20// USA.
21
22// As a special exception, you may use this file as part of a free software
23// library without restriction.  Specifically, if other files instantiate
24// templates or use macros or inline functions from this file, or you compile
25// this file and link it with other files to produce an executable, this
26// file does not by itself cause the resulting executable to be covered by
27// the GNU General Public License.  This exception does not however
28// invalidate any other reasons why the executable file might be covered by
29// the GNU General Public License.
30
31// Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr>
32
33/** @file indirect_array.h
34 *  This is an internal header file, included by other library headers.
35 *  You should not attempt to use it directly.
36 */
37
38#ifndef _INDIRECT_ARRAY_H
39#define _INDIRECT_ARRAY_H 1
40
41#pragma GCC system_header
42
43namespace std
44{
45  /**
46   *  @brief  Reference to arbitrary subset of an array.
47   *
48   *  An indirect_array is a reference to the actual elements of an array
49   *  specified by an ordered array of indices.  The way to get an indirect_array is to
50   *  call operator[](valarray<size_t>) on a valarray.  The returned
51   *  indirect_array then permits carrying operations out on the referenced
52   *  subset of elements in the original valarray.
53   *
54   *  For example, if an indirect_array is obtained using the array (4,2,0) as
55   *  an argument, and then assigned to an array containing (1,2,3), then the
56   *  underlying array will have array[0]==3, array[2]==2, and array[4]==1.
57   *
58   *  @param  Tp  Element type.
59   */
60  template <class _Tp>
61    class indirect_array
62    {
63    public:
64      typedef _Tp value_type;
65
66      // _GLIBCXX_RESOLVE_LIB_DEFECTS
67      // 253. valarray helper functions are almost entirely useless
68
69      ///  Copy constructor.  Both slices refer to the same underlying array.
70      indirect_array(const indirect_array&);
71
72      ///  Assignment operator.  Assigns elements to corresponding elements
73      ///  of @a a.
74      indirect_array& operator=(const indirect_array&);
75
76      ///  Assign slice elements to corresponding elements of @a v.
77      void operator=(const valarray<_Tp>&) const;
78      ///  Multiply slice elements by corresponding elements of @a v.
79      void operator*=(const valarray<_Tp>&) const;
80      ///  Divide slice elements by corresponding elements of @a v.
81      void operator/=(const valarray<_Tp>&) const;
82      ///  Modulo slice elements by corresponding elements of @a v.
83      void operator%=(const valarray<_Tp>&) const;
84      ///  Add corresponding elements of @a v to slice elements.
85      void operator+=(const valarray<_Tp>&) const;
86      ///  Subtract corresponding elements of @a v from slice elements.
87      void operator-=(const valarray<_Tp>&) const;
88      ///  Logical xor slice elements with corresponding elements of @a v.
89      void operator^=(const valarray<_Tp>&) const;
90      ///  Logical and slice elements with corresponding elements of @a v.
91      void operator&=(const valarray<_Tp>&) const;
92      ///  Logical or slice elements with corresponding elements of @a v.
93      void operator|=(const valarray<_Tp>&) const;
94      ///  Left shift slice elements by corresponding elements of @a v.
95      void operator<<=(const valarray<_Tp>&) const;
96      ///  Right shift slice elements by corresponding elements of @a v.
97      void operator>>=(const valarray<_Tp>&) const;
98      ///  Assign all slice elements to @a t.
99      void operator= (const _Tp&) const;
100      //    ~indirect_array();
101
102      template<class _Dom>
103      void operator=(const _Expr<_Dom, _Tp>&) const;
104      template<class _Dom>
105      void operator*=(const _Expr<_Dom, _Tp>&) const;
106      template<class _Dom>
107      void operator/=(const _Expr<_Dom, _Tp>&) const;
108      template<class _Dom>
109      void operator%=(const _Expr<_Dom, _Tp>&) const;
110      template<class _Dom>
111      void operator+=(const _Expr<_Dom, _Tp>&) const;
112      template<class _Dom>
113      void operator-=(const _Expr<_Dom, _Tp>&) const;
114      template<class _Dom>
115      void operator^=(const _Expr<_Dom, _Tp>&) const;
116      template<class _Dom>
117      void operator&=(const _Expr<_Dom, _Tp>&) const;
118      template<class _Dom>
119      void operator|=(const _Expr<_Dom, _Tp>&) const;
120      template<class _Dom>
121      void operator<<=(const _Expr<_Dom, _Tp>&) const;
122      template<class _Dom>
123      void operator>>=(const _Expr<_Dom, _Tp>&) const;
124
125    private:
126      ///  Copy constructor.  Both slices refer to the same underlying array.
127      indirect_array(_Array<_Tp>, size_t, _Array<size_t>);
128
129      friend class valarray<_Tp>;
130      friend class gslice_array<_Tp>;
131
132      const size_t       _M_sz;
133      const _Array<size_t> _M_index;
134      const _Array<_Tp>  _M_array;
135
136      // not implemented
137      indirect_array();
138    };
139
140  template<typename _Tp>
141    inline
142    indirect_array<_Tp>::indirect_array(const indirect_array<_Tp>& __a)
143    : _M_sz(__a._M_sz), _M_index(__a._M_index), _M_array(__a._M_array) {}
144
145  template<typename _Tp>
146     inline
147     indirect_array<_Tp>::indirect_array(_Array<_Tp> __a, size_t __s,
148                                         _Array<size_t> __i)
149     : _M_sz(__s), _M_index(__i), _M_array(__a) {}
150
151  template<typename _Tp>
152     inline indirect_array<_Tp>&
153     indirect_array<_Tp>::operator=(const indirect_array<_Tp>& __a)
154     {
155       std::__valarray_copy(__a._M_array, _M_sz, __a._M_index, _M_array, _M_index);
156       return *this;
157     }
158
159
160  template<typename _Tp>
161     inline void
162     indirect_array<_Tp>::operator=(const _Tp& __t) const
163     { std::__valarray_fill(_M_array, _M_index, _M_sz, __t); }
164
165  template<typename _Tp>
166     inline void
167     indirect_array<_Tp>::operator=(const valarray<_Tp>& __v) const
168     { std::__valarray_copy(_Array<_Tp>(__v), _M_sz, _M_array, _M_index); }
169
170  template<typename _Tp>
171     template<class _Dom>
172       inline void
173       indirect_array<_Tp>::operator=(const _Expr<_Dom,_Tp>& __e) const
174       { std::__valarray_copy(__e, _M_sz, _M_array, _M_index); }
175
176#undef _DEFINE_VALARRAY_OPERATOR
177#define _DEFINE_VALARRAY_OPERATOR(_Op, _Name)                           \
178  template<typename _Tp>                                                \
179    inline void                                                         \
180    indirect_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const\
181    {                                                                   \
182      _Array_augmented_##_Name(_M_array, _M_index, _Array<_Tp>(__v), _M_sz); \
183    }                                                                   \
184                                                                        \
185  template<typename _Tp>                                                \
186    template<class _Dom>                                                \
187      inline void                                                       \
188      indirect_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\
189      {                                                                 \
190        _Array_augmented_##_Name(_M_array, _M_index, __e, _M_sz);       \
191      }
192
193_DEFINE_VALARRAY_OPERATOR(*, __multiplies)
194_DEFINE_VALARRAY_OPERATOR(/, __divides)
195_DEFINE_VALARRAY_OPERATOR(%, __modulus)
196_DEFINE_VALARRAY_OPERATOR(+, __plus)
197_DEFINE_VALARRAY_OPERATOR(-, __minus)
198_DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor)
199_DEFINE_VALARRAY_OPERATOR(&, __bitwise_and)
200_DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)
201_DEFINE_VALARRAY_OPERATOR(<<, __shift_left)
202_DEFINE_VALARRAY_OPERATOR(>>, __shift_right)
203
204#undef _DEFINE_VALARRAY_OPERATOR
205
206} // std::
207
208#endif /* _INDIRECT_ARRAY_H */
209
210// Local Variables:
211// mode:c++
212// End:
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