8e20f5499f
git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@1028 3ecf2c5c-341e-0410-92b4-d18e462d057c
98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
// src/templates/sequences.tcc - Copyright 2005, 2006, University
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// of Padova, dept. of Pure and Applied
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// Mathematics
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//
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// This file is part of SGPEMv2.
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//
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// This is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// SGPEMv2 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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//
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// You should have received a copy of the GNU General Public License
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// along with SGPEMv2; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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/* Helper templates to make easier to work on an entire sequence over a container */
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#include <iterator>
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#include <utility>
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// Class defining an input sequence
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template<typename In>
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class Iseq : protected std::pair<In, In>
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{
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public:
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typedef typename In::pointer pointer;
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typedef typename In::reference reference;
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explicit Iseq(In a, In b)
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: std::pair<In, In>(a, b)
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{}
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operator bool()
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{ return Iseq::first != Iseq::second; }
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Iseq& operator++()
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{ ++Iseq::first; return *this; }
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Iseq operator++(int)
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{ Iseq t = *this; ++Iseq::first; return t; }
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const reference operator*() const
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{ return *Iseq::first; }
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const In& operator->() const
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{ return Iseq::first; }
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bool operator==(const Iseq& i) const
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{ return Iseq::first == i.first; }
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bool operator!=(const Iseq& i) const
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{ return Iseq::first != i.first; }
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};
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// Adaptor functions for containers:
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template<class Container>
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Iseq<typename Container::const_iterator>
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iseq(const Container& c)
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{
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return Iseq<typename Container::const_iterator>(c.begin(), c.end());
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}
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template<class Container>
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Iseq<typename Container::iterator>
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iseq(Container& c)
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{
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return Iseq<typename Container::iterator>(c.begin(), c.end());
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}
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// Adaptor functions for containers that support reverse iteration
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template<class Container>
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Iseq<typename Container::const_reverse_iterator>
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riseq(const Container& c)
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{
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return Iseq<typename Container::const_reverse_iterator>(c.rbegin(), c.rend());
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}
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template<class Container>
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Iseq<typename Container::reverse_iterator>
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riseq(Container& c)
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{
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return Iseq<typename Container::reverse_iterator>(c.rbegin(), c.rend());
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}
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