99 lines
2.7 KiB
C++
99 lines
2.7 KiB
C++
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/*
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ITER-TYPE-BINDING.hpp - control type variations for IterAdapter
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Copyright (C) Lumiera.org
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2010, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program 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
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file iter-type-binding.hpp
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** Type re-binding helper template for IterAdapter and friends.
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** This header defines a trait template which is used by the Iterator
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** adapters to figure out the value-, pointer- and reference types
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** when wrapping iterators or containers. For extending the use of
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** Iterator adapters and Iter-tools to situations involving const
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** iterators or custom containers, explicit specialisations
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** might be injected prior to instantiating the Iterator adapter
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** template.
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**
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*/
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#ifndef LIB_ITER_TYPE_BINDING_H
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#define LIB_ITER_TYPE_BINDING_H
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#include "lib/error.hpp"
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namespace mobject {
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namespace session {
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class Scope;
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}}
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#include <vector>
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using std::vector;
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namespace lib {
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namespace iter {
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/**
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* Type re-binding helper template for creating nested typedefs
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* for use by IterAdapter or similar "Lumiera Forward Iterators".
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* This trait provides a value-, reference- and pointer type,
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* similar to what the STL does.
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* @note client code might define specialisations
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* to handle tricky situations (like const_reverse_iter)
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*/
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template<typename TY>
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struct TypeBinding
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{
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typedef typename TY::pointer pointer;
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typedef typename TY::reference reference;
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typedef typename TY::value_type value_type;
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};
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template<typename TY>
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struct TypeBinding<TY *>
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{
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typedef TY value_type;
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typedef TY& reference;
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typedef TY* pointer;
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};
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template<typename TY>
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struct TypeBinding<const TY *>
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{
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typedef TY value_type;
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typedef const TY& reference;
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typedef const TY* pointer;
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};
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using mobject::session::Scope;
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template<>
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struct TypeBinding<vector<Scope>::const_reverse_iterator>
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{
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typedef const Scope value_type;
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typedef Scope const& reference;
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typedef const Scope* pointer;
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};
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}} // namespace lib
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#endif
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