/usr/include/vigra/iteratorfacade.hxx is in libvigraimpex-dev 1.10.0+git20160211.167be93+dfsg-2+b5.
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/* */
/* Copyright 2014 by Thorsten Beier */
/* */
/* This file is part of the VIGRA computer vision library. */
/* The VIGRA Website is */
/* http://hci.iwr.uni-heidelberg.de/vigra/ */
/* Please direct questions, bug reports, and contributions to */
/* ullrich.koethe@iwr.uni-heidelberg.de or */
/* vigra@informatik.uni-hamburg.de */
/* */
/* Permission is hereby granted, free of charge, to any person */
/* obtaining a copy of this software and associated documentation */
/* files (the "Software"), to deal in the Software without */
/* restriction, including without limitation the rights to use, */
/* copy, modify, merge, publish, distribute, sublicense, and/or */
/* sell copies of the Software, and to permit persons to whom the */
/* Software is furnished to do so, subject to the following */
/* conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the */
/* Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES */
/* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND */
/* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT */
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/* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING */
/* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR */
/* OTHER DEALINGS IN THE SOFTWARE. */
/* */
/************************************************************************/
#ifndef VIGRA_ITERATORFACADE_HXX
#define VIGRA_ITERATORFACADE_HXX
/*std*/
#include <iterator>
/*vigra*/
#include "metaprogramming.hxx"
namespace vigra {
// facade needs to make this class
// a friend class
class IteratorFacadeCoreAccess{
public:
template<class F>
static bool equal(const F & fa,const F & fb){
return fa.equal(fb);
}
template<class F,class REFERENCE>
static REFERENCE dereference(const F & f){
return f.dereference();
}
template<class F>
static void increment(F & f){
f.increment();
}
};
// see boost iterator facade
template<class FACADE,class VALUE_TYPE,bool IS_CONST = true>
class ForwardIteratorFacade{
private:
public:
typedef std::forward_iterator_tag iterator_category;
typedef typename UnqualifiedType<VALUE_TYPE>::type value_type;
typedef typename IfBool<IS_CONST, value_type const * , value_type *>::type pointer;
typedef typename IfBool<IS_CONST, const value_type & , value_type &>::type reference;
typedef std::ptrdiff_t difference_type;
FACADE & operator++()
{
IteratorFacadeCoreAccess::increment(getF());
return getF();
}
FACADE operator++(int)
{
FACADE res(getF());
IteratorFacadeCoreAccess::increment(getF());
return res;
}
bool operator ==(const FACADE & f)const{
return IteratorFacadeCoreAccess::equal(getF(),f);
}
bool operator !=(const FACADE & f)const{
return !IteratorFacadeCoreAccess::equal(getF(),f);
}
reference operator*()const{
return IteratorFacadeCoreAccess:: template dereference<FACADE,reference>(getF());
}
pointer operator->()const{
return &IteratorFacadeCoreAccess:: template dereference<FACADE,reference>(getF());
}
private:
const FACADE & getF()const{
return *static_cast<FACADE const *>(this);
}
FACADE & getF(){
return *static_cast<FACADE *>(this);
}
};
template<class MAP>
class MapKeyIterator
: public ForwardIteratorFacade<MapKeyIterator<MAP>,typename MAP::key_type,true>
{
public:
typedef ForwardIteratorFacade<MapKeyIterator<MAP>,typename MAP::key_type,true> BaseType;
typedef typename MAP::const_iterator InternalIterator;
typedef typename BaseType::value_type value_type;
typedef typename BaseType::reference reference;
typedef typename BaseType::pointer pointer;
MapKeyIterator(InternalIterator i)
: iter_(i)
{}
private:
friend class IteratorFacadeCoreAccess;
bool equal(const MapKeyIterator & other) const{
return iter_ == other.iter_;
}
void increment(){
++iter_;
}
reference dereference()const{
return iter_->first;
}
InternalIterator iter_;
};
template <class MAP>
inline MapKeyIterator<MAP>
key_begin(MAP const & m)
{
return MapKeyIterator<MAP>(m.begin());
}
template <class MAP>
inline MapKeyIterator<MAP>
key_end(MAP const & m)
{
return MapKeyIterator<MAP>(m.end());
}
} // namespace vigra
#endif /* VIGRA_ITERATORFACADE_HXX */
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