0,0 → 1,119 |
// The template and inlines for the -*- C++ -*- gslice class. |
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// Copyright (C) 1997-2001 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. |
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// 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. |
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// 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. |
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// 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. |
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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 |
#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 |
{ |
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(); |
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// XXX: See the note above. |
gslice& operator= (const gslice&); |
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size_t start () const; |
valarray<size_t> size () const; |
valarray<size_t> stride () const; |
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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; } |
}; |
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_Indexer* _M_index; |
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template<typename _Tp> friend class valarray; |
}; |
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inline size_t |
gslice::start () const |
{ return _M_index ? _M_index->_M_start : 0; } |
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inline valarray<size_t> |
gslice::size () const |
{ return _M_index ? _M_index->_M_size : valarray<size_t>(); } |
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inline valarray<size_t> |
gslice::stride () const |
{ 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 |
gslice::gslice(size_t __o, const valarray<size_t>& __l, |
const valarray<size_t>& __s) |
: _M_index(new gslice::_Indexer(__o, __l, __s)) {} |
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inline |
gslice::gslice(const gslice& __g) : _M_index(__g._M_index) |
{ if (_M_index) _M_index->_M_increment_use(); } |
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inline |
gslice::~gslice() |
{ if (_M_index && _M_index->_M_decrement_use() == 0) delete _M_index; } |
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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; |
} |
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} // std:: |
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#endif /* _CPP_BITS_GSLICE_H */ |
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// Local Variables: |
// mode:c++ |
// End: |