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TBE/MinGW/include/c++/3.2.3/bits/gslice.h

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+// The template and inlines for the -*- C++ -*- gslice class.
+
+// Copyright (C) 1997, 1998, 1999, 2000, 2001 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 2, 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+// Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr>
+
+/** @file gslice.h
+ *  This is an internal header file, included by other library headers.
+ *  You should not attempt to use it directly.
+ */
+
+#ifndef _CPP_BITS_GSLICE_H
+#define _CPP_BITS_GSLICE_H 1
+
+#pragma GCC system_header
+
+namespace std {
+    
+    class gslice
+    {
+    public:
+        gslice ();
+        gslice (size_t, const valarray<size_t>&, const valarray<size_t>&);
+        // XXX: the IS says the copy-ctor and copy-assignment operators are
+        //      synthetized by the compiler but they are just unsuitable
+        //      for a ref-counted semantic
+        gslice(const gslice&);
+        ~gslice();
+
+        // XXX: See the note above.
+        gslice& operator= (const gslice&);
+        
+        size_t           start () const;
+        valarray<size_t> size () const;
+        valarray<size_t> stride () const;
+        
+    private:
+        struct _Indexer {
+            size_t _M_count;
+            size_t _M_start;
+            valarray<size_t> _M_size;
+            valarray<size_t> _M_stride;
+            valarray<size_t> _M_index;
+            _Indexer(size_t, const valarray<size_t>&,
+                     const valarray<size_t>&);
+            void _M_increment_use() { ++_M_count; }
+            size_t _M_decrement_use() { return --_M_count; }
+        };
+
+        _Indexer* _M_index;
+        
+        template<typename _Tp> friend class valarray;
+    };
+    
+    inline size_t
+    gslice::start () const
+    { return _M_index ? _M_index->_M_start : 0; }
+    
+    inline valarray<size_t>
+    gslice::size () const
+    { return _M_index ? _M_index->_M_size : valarray<size_t>(); }
+    
+    inline valarray<size_t>
+    gslice::stride () const
+    { return _M_index ? _M_index->_M_stride : valarray<size_t>(); }
+    
+    inline gslice::gslice () : _M_index(0) {}
+
+    inline
+    gslice::gslice(size_t __o, const valarray<size_t>& __l,
+                   const valarray<size_t>& __s)
+            : _M_index(new gslice::_Indexer(__o, __l, __s)) {}
+
+    inline
+    gslice::gslice(const gslice& __g) : _M_index(__g._M_index)
+    { if (_M_index) _M_index->_M_increment_use(); }
+    
+    inline
+    gslice::~gslice()
+    { if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index; }
+
+    inline gslice&
+    gslice::operator= (const gslice& __g)
+    {
+        if (__g._M_index) __g._M_index->_M_increment_use();
+        if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index;
+        _M_index = __g._M_index;
+        return *this;
+    }
+            
+    
+} // std::
+
+
+#endif /* _CPP_BITS_GSLICE_H */
+
+// Local Variables:
+// mode:c++
+// End: