libstdc++-v3/include/bits/slice_array.h

   1 // The template and inlines for the -*- C++ -*- slice_array class.
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr>
  31
  32 /** @file slice_array.h
  33  *  This is an internal header file, included by other library headers.
  34  *  You should not attempt to use it directly.
  35  */
  36
  37 #ifndef _SLICE_ARRAY_H
  38 #define _SLICE_ARRAY_H 1
  39
  40 #pragma GCC system_header
  41
  42 namespace std
  43 {
  44   class slice
  45   {
  46   public:
  47     slice();
  48     slice(size_t, size_t, size_t);
  49
  50     size_t start() const;
  51     size_t size() const;
  52     size_t stride() const;
  53
  54   private:
  55     size_t _M_off;                      // offset
  56     size_t _M_sz;                       // size
  57     size_t _M_st;                       // stride unit
  58   };
  59
  60   // The default constructor constructor is not required to initialize
  61   // data members with any meaningful values, so we choose to do nothing.
  62   inline
  63   slice::slice() {}
  64
  65   inline
  66   slice::slice(size_t __o, size_t __d, size_t __s)
  67     : _M_off(__o), _M_sz(__d), _M_st(__s) {}
  68
  69   inline size_t
  70   slice::start() const
  71   { return _M_off; }
  72
  73   inline size_t
  74   slice::size() const
  75   { return _M_sz; }
  76
  77   inline size_t
  78   slice::stride() const
  79   { return _M_st; }
  80
  81   template<typename _Tp>
  82     class slice_array
  83     {
  84     public:
  85       typedef _Tp value_type;
  86
  87       // This constructor is implemented since we need to return a value.
  88       slice_array(const slice_array&);
  89
  90       // This operator must be public.  See DR-253.
  91       slice_array& operator=(const slice_array&);
  92
  93       void operator=(const valarray<_Tp>&) const;
  94       void operator*=(const valarray<_Tp>&) const;
  95       void operator/=(const valarray<_Tp>&) const;
  96       void operator%=(const valarray<_Tp>&) const;
  97       void operator+=(const valarray<_Tp>&) const;
  98       void operator-=(const valarray<_Tp>&) const;
  99       void operator^=(const valarray<_Tp>&) const;
 100       void operator&=(const valarray<_Tp>&) const;
 101       void operator|=(const valarray<_Tp>&) const;
 102       void operator<<=(const valarray<_Tp>&) const;
 103       void operator>>=(const valarray<_Tp>&) const;
 104       void operator=(const _Tp &) const;
 105       //        ~slice_array ();
 106
 107       template<class _Dom>
 108         void operator=(const _Expr<_Dom,_Tp>&) const;
 109       template<class _Dom>
 110         void operator*=(const _Expr<_Dom,_Tp>&) const;
 111       template<class _Dom>
 112         void operator/=(const _Expr<_Dom,_Tp>&) const;
 113       template<class _Dom>
 114         void operator%=(const _Expr<_Dom,_Tp>&) const;
 115       template<class _Dom>
 116         void operator+=(const _Expr<_Dom,_Tp>&) const;
 117       template<class _Dom>
 118         void operator-=(const _Expr<_Dom,_Tp>&) const;
 119       template<class _Dom>
 120         void operator^=(const _Expr<_Dom,_Tp>&) const;
 121       template<class _Dom>
 122         void operator&=(const _Expr<_Dom,_Tp>&) const;
 123       template<class _Dom>
 124         void operator|=(const _Expr<_Dom,_Tp>&) const;
 125       template<class _Dom>
 126         void operator<<=(const _Expr<_Dom,_Tp>&) const;
 127       template<class _Dom>
 128         void operator>>=(const _Expr<_Dom,_Tp>&) const;
 129
 130     private:
 131       friend class valarray<_Tp>;
 132       slice_array(_Array<_Tp>, const slice&);
 133
 134       const size_t     _M_sz;
 135       const size_t     _M_stride;
 136       const _Array<_Tp> _M_array;
 137
 138       // not implemented
 139       slice_array();
 140     };
 141
 142   template<typename _Tp>
 143     inline
 144     slice_array<_Tp>::slice_array(_Array<_Tp> __a, const slice& __s)
 145       : _M_sz(__s.size()), _M_stride(__s.stride()),
 146         _M_array(__a.begin() + __s.start()) {}
 147
 148   template<typename _Tp>
 149     inline
 150     slice_array<_Tp>::slice_array(const slice_array<_Tp>& a)
 151       : _M_sz(a._M_sz), _M_stride(a._M_stride), _M_array(a._M_array) {}
 152
 153   //    template<typename _Tp>
 154   //    inline slice_array<_Tp>::~slice_array () {}
 155
 156   template<typename _Tp>
 157     inline slice_array<_Tp>&
 158     slice_array<_Tp>::operator=(const slice_array<_Tp>& __a)
 159     {
 160       std::__valarray_copy(__a._M_array, __a._M_sz, __a._M_stride,
 161                            _M_array, _M_stride);
 162       return *this;
 163     }
 164
 165   template<typename _Tp>
 166     inline void
 167     slice_array<_Tp>::operator=(const _Tp& __t) const
 168     { std::__valarray_fill(_M_array, _M_sz, _M_stride, __t); }
 169
 170   template<typename _Tp>
 171     inline void
 172     slice_array<_Tp>::operator=(const valarray<_Tp>& __v) const
 173     { std::__valarray_copy(_Array<_Tp>(__v), _M_array, _M_sz, _M_stride); }
 174
 175   template<typename _Tp>
 176   template<class _Dom>
 177     inline void
 178     slice_array<_Tp>::operator=(const _Expr<_Dom,_Tp>& __e) const
 179     { std::__valarray_copy(__e, _M_sz, _M_array, _M_stride); }
 180
 181 #undef _DEFINE_VALARRAY_OPERATOR
 182 #define _DEFINE_VALARRAY_OPERATOR(_Op,_Name)                            \
 183   template<typename _Tp>                                                \
 184     inline void                                                         \
 185     slice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const   \
 186     {                                                                   \
 187       _Array_augmented_##_Name(_M_array, _M_sz, _M_stride, _Array<_Tp>(__v));\
 188     }                                                                   \
 189                                                                         \
 190   template<typename _Tp>                                                \
 191     template<class _Dom>                                                \
 192       inline void                                                       \
 193       slice_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\
 194       {                                                                 \
 195           _Array_augmented_##_Name(_M_array, _M_stride, __e, _M_sz);    \
 196       }
 197
 198
 199 _DEFINE_VALARRAY_OPERATOR(*, __multiplies)
 200 _DEFINE_VALARRAY_OPERATOR(/, __divides)
 201 _DEFINE_VALARRAY_OPERATOR(%, __modulus)
 202 _DEFINE_VALARRAY_OPERATOR(+, __plus)
 203 _DEFINE_VALARRAY_OPERATOR(-, __minus)
 204 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor)
 205 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and)
 206 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)
 207 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left)
 208 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right)
 209
 210 #undef _DEFINE_VALARRAY_OPERATOR
 211
 212 } // std::
 213
 214 #endif /* _SLICE_ARRAY_H */
 215
 216 // Local Variables:
 217 // mode:c++
 218 // End: