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  1. // The template and inlines for the -*- C++ -*- gslice class.
  2.  
  3. // Copyright (C) 1997-2001 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. #ifndef _CPP_BITS_GSLICE_H
  33. #define _CPP_BITS_GSLICE_H 1
  34.  
  35. #pragma GCC system_header
  36.  
  37. namespace std {
  38.    
  39.     class gslice
  40.     {
  41.     public:
  42.         gslice ();
  43.         gslice (size_t, const valarray<size_t>&, const valarray<size_t>&);
  44.         // XXX: the IS says the copy-ctor and copy-assignment operators are
  45.         //      synthetized by the compiler but they are just unsuitable
  46.         //      for a ref-counted semantic
  47.         gslice(const gslice&);
  48.         ~gslice();
  49.  
  50.         // XXX: See the note above.
  51.         gslice& operator= (const gslice&);
  52.        
  53.         size_t           start () const;
  54.         valarray<size_t> size () const;
  55.         valarray<size_t> stride () const;
  56.        
  57.     private:
  58.         struct _Indexer {
  59.             size_t _M_count;
  60.             size_t _M_start;
  61.             valarray<size_t> _M_size;
  62.             valarray<size_t> _M_stride;
  63.             valarray<size_t> _M_index;
  64.             _Indexer(size_t, const valarray<size_t>&,
  65.                      const valarray<size_t>&);
  66.             void _M_increment_use() { ++_M_count; }
  67.             size_t _M_decrement_use() { return --_M_count; }
  68.         };
  69.  
  70.         _Indexer* _M_index;
  71.        
  72.         template<typename _Tp> friend class valarray;
  73.     };
  74.    
  75.     inline size_t
  76.     gslice::start () const
  77.     { return _M_index ? _M_index->_M_start : 0; }
  78.    
  79.     inline valarray<size_t>
  80.     gslice::size () const
  81.     { return _M_index ? _M_index->_M_size : valarray<size_t>(); }
  82.    
  83.     inline valarray<size_t>
  84.     gslice::stride () const
  85.     { return _M_index ? _M_index->_M_stride : valarray<size_t>(); }
  86.    
  87.     inline gslice::gslice () : _M_index(0) {}
  88.  
  89.     inline
  90.     gslice::gslice(size_t __o, const valarray<size_t>& __l,
  91.                    const valarray<size_t>& __s)
  92.             : _M_index(new gslice::_Indexer(__o, __l, __s)) {}
  93.  
  94.     inline
  95.     gslice::gslice(const gslice& __g) : _M_index(__g._M_index)
  96.     { if (_M_index) _M_index->_M_increment_use(); }
  97.    
  98.     inline
  99.     gslice::~gslice()
  100.     { if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index; }
  101.  
  102.     inline gslice&
  103.     gslice::operator= (const gslice& __g)
  104.     {
  105.         if (__g._M_index) __g._M_index->_M_increment_use();
  106.         if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index;
  107.         _M_index = __g._M_index;
  108.         return *this;
  109.     }
  110.            
  111.    
  112. } // std::
  113.  
  114.  
  115. #endif /* _CPP_BITS_GSLICE_H */
  116.  
  117. // Local Variables:
  118. // mode:c++
  119. // End:
  120.