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