// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2015, Knut Reinert, FU Berlin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of Knut Reinert or the FU Berlin nor the names of
//       its contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL KNUT REINERT OR THE FU BERLIN BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
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// ==========================================================================

#ifndef SEQAN_HEADER_GRAPH_ITERATOR_OUTEDGE_H
#define SEQAN_HEADER_GRAPH_ITERATOR_OUTEDGE_H

namespace SEQAN_NAMESPACE_MAIN
{
//////////////////////////////////////////////////////////////////////////////
// Graph OutEdgeIterator
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

/*!
 * @class OutEdgeIterator
 * @extends Iter
 * @brief Out-edge iterator for @link Graph @endlink.
 *
 * @signature Iterator<TGraph, OutEdgeIterator>::Type;
 * @signature template <typename TGraph, typename TSpec>
 *            class Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> >;
 *
 * @tparam TGraph The graph to iterate the edges of.
 *
 * The first signature is the signature of the corresponding @link ContainerConcept#Iterator graph's Iterator @endlink
 * metafunction call.  The second call is the internal definition of the type.  You should always get this type using
 * the metafunction call from the first signature.
 *
 *
 * @fn OutEdgeIterator::OutEdgeIterator
 * @brief Constructor
 *
 * @signature Iter::Iter();
 * @signature Iter::Iter(iter);
 * @signature Iter::Iter(graph, v);
 *
 * @param[in] iter  Other OutEdgeIterator to copy from.
 * @param[in] graph The @link Graph @endlink to iterate edges of.
 * @param[in] v     The descriptor of the vertex to iterate out edges of.
 */


//////////////////////////////////////////////////////////////////////////////
// InternalOutEdgeIterator for Directed Graph
//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
class Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >
{
public:
    typedef Graph<Directed<TCargo, TGraphSpec> > TGraph_;
    typedef typename EdgeDescriptor<TGraph_>::Type TEdgeDescriptor_;
    typedef typename VertexDescriptor<TGraph_>::Type TVertexDescriptor_;
    TGraph_ const* data_host;
    TVertexDescriptor_ data_source;
    TEdgeDescriptor_ data_edge;

    Iter()
    {
        SEQAN_CHECKPOINT
    }

    Iter(TGraph_ const& _graph, TVertexDescriptor_ const v) :
        data_host(&_graph),
        data_source(v),
        data_edge(getValue(_graph.data_vertex,v))
    {
        SEQAN_CHECKPOINT
    }

    Iter(Iter const& _iter) :
        data_host(_iter.data_host),
        data_source(_iter.data_source),
        data_edge(_iter.data_edge)
    {
        SEQAN_CHECKPOINT
    }

    ~Iter() {
        SEQAN_CHECKPOINT
    }

    Iter const&    operator = (Iter const & _other) {
        SEQAN_CHECKPOINT
        if (this == &_other) return *this;
        data_host = _other.data_host;
        data_source = _other.data_source;
        data_edge = _other.data_edge;
        return *this;
    }
//____________________________________________________________________________
};

//////////////////////////////////////////////////////////////////////////////
// Graph InternalOutEdgeIterator - Metafunctions
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec>
struct Iterator<Graph<Directed<TCargo, TGraphSpec> >, OutEdgeIterator>
{
    typedef Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<OutEdgeIterator> > > Type;
};

template<typename TCargo, typename TGraphSpec>
struct Iterator<Graph<Directed<TCargo, TGraphSpec> > const, OutEdgeIterator> :
    public Iterator<Graph<Directed<TCargo, TGraphSpec> >, OutEdgeIterator> {};


//////////////////////////////////////////////////////////////////////////////
// InternalOutEdgeIterator for Tree
//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
class Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >
{
public:
    typedef Graph<Tree<TCargo, TGraphSpec> > TGraph;
    typedef typename EdgeDescriptor<TGraph>::Type TEdgeDescriptor;
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor;
    TGraph const* data_host;
    TVertexDescriptor data_source;
    TEdgeDescriptor data_edge;

    Iter()
    {
        SEQAN_CHECKPOINT
    }

    Iter(TGraph const& _graph, TVertexDescriptor const v) :
        data_host(&_graph),
        data_source(v),
        data_edge(getValue(_graph.data_vertex,v))
    {
        SEQAN_CHECKPOINT
    }

    Iter(Iter const& _iter) :
        data_host(_iter.data_host),
        data_source(_iter.data_source),
        data_edge(_iter.data_edge)
    {
        SEQAN_CHECKPOINT
    }

    ~Iter() {
        SEQAN_CHECKPOINT
    }

    Iter const&    operator = (Iter const & _other) {
        SEQAN_CHECKPOINT
        if (this == &_other) return *this;
        data_host = _other.data_host;
        data_source = _other.data_source;
        data_edge = _other.data_edge;
        return *this;
    }
//____________________________________________________________________________
};

//////////////////////////////////////////////////////////////////////////////
// Graph InternalOutEdgeIterator - Metafunctions
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec>
struct Iterator<Graph<Tree<TCargo, TGraphSpec> >, OutEdgeIterator>
{
    typedef Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<OutEdgeIterator> > > Type;
};

template<typename TCargo, typename TGraphSpec>
struct Iterator<Graph<Tree<TCargo, TGraphSpec> > const, OutEdgeIterator> :
    public Iterator<Graph<Tree<TCargo, TGraphSpec> >, OutEdgeIterator> {};


//////////////////////////////////////////////////////////////////////////////
// InternalOutEdgeIterator for Undirected graph
//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
class Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >
{
public:
    typedef Graph<Undirected<TCargo, TGraphSpec> > TGraph;
    typedef typename EdgeDescriptor<TGraph>::Type TEdgeDescriptor;
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor;
    TGraph const* data_host;
    TVertexDescriptor data_source;
    TEdgeDescriptor data_edge;

    Iter()
    {
        SEQAN_CHECKPOINT
    }

    Iter(TGraph const& _graph, TVertexDescriptor const v) :
        data_host(&_graph),
        data_source(v),
        data_edge(getValue(_graph.data_vertex,v))
    {
        SEQAN_CHECKPOINT
    }

    Iter(Iter const& _iter) :
        data_host(_iter.data_host),
        data_source(_iter.data_source),
        data_edge(_iter.data_edge)
    {
        SEQAN_CHECKPOINT
    }

    ~Iter() {
        SEQAN_CHECKPOINT
    }

    Iter const&    operator = (Iter const & _other) {
        SEQAN_CHECKPOINT
        if (this == &_other) return *this;
        data_host = _other.data_host;
        data_source = _other.data_source;
        data_edge = _other.data_edge;
        return *this;
    }
//____________________________________________________________________________
};

//////////////////////////////////////////////////////////////////////////////
// Graph InternalOutEdgeIterator - Metafunctions
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec>
struct Iterator<Graph<Undirected<TCargo, TGraphSpec> >, OutEdgeIterator>
{
    typedef Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<OutEdgeIterator> > > Type;
};

template<typename TCargo,typename TGraphSpec>
struct Iterator<Graph<Undirected<TCargo, TGraphSpec> > const, OutEdgeIterator> :
    public Iterator<Graph<Undirected<TCargo, TGraphSpec> >, OutEdgeIterator> {};



//////////////////////////////////////////////////////////////////////////////
// Graph InternalOutEdgeIterator for Automaton
//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TIteratorSpec>
class Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > >
{
public:
    typedef Graph<Automaton<TAlphabet, TCargo, TGraphSpec> > TGraph_;
    typedef typename EdgeDescriptor<TGraph_>::Type TEdgeDescriptor_;
    typedef typename VertexDescriptor<TGraph_>::Type TVertexDescriptor_;
    typedef typename Size<TAlphabet>::Type TSize_;
    TGraph_ const* data_host;
    TVertexDescriptor_ data_source;
    TSize_ data_pos;
    TSize_ data_begin;
    TSize_ data_end;

    Iter()
    {
        SEQAN_CHECKPOINT
    }

    Iter(TGraph_ const& _graph, TVertexDescriptor_ const v) :
        data_host(&_graph),
        data_source(v)
    {
        SEQAN_CHECKPOINT
        TVertexDescriptor_ nilVal = getNil<TVertexDescriptor_>();
        TSize_ table_length = ValueSize<TAlphabet>::VALUE;
        TSize_ pos = 0;
        while (    (pos < table_length) &&
                (_graph.data_vertex[v].data_edge[pos].data_target == nilVal))
        {
                ++pos;
        }
        data_pos = pos;
        data_begin = pos;
        data_end = table_length;
    }

    Iter(Iter const& _iter) :
        data_host(_iter.data_host),
        data_source(_iter.data_source),
        data_pos(_iter.data_pos),
        data_begin(_iter.data_begin),
        data_end(_iter.data_end)
    {
        SEQAN_CHECKPOINT
    }

    ~Iter()
    {
        SEQAN_CHECKPOINT
    }

    Iter const&    operator = (Iter const & _other)
    {
        SEQAN_CHECKPOINT
        if (this == &_other) return *this;
        data_host = _other.data_host;
        data_source = _other.data_source;
        data_pos = _other.data_pos;
        data_begin = _other.data_begin;
        data_end = _other.data_end;
        return *this;
    }
//____________________________________________________________________________
};


//////////////////////////////////////////////////////////////////////////////
// Graph InternalOutEdgeIterator - Metafunctions
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec>
struct Iterator<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, OutEdgeIterator>
{
    typedef Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<OutEdgeIterator> > > Type;
};

template<typename TAlphabet, typename TCargo, typename TGraphSpec>
struct Iterator<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> > const, OutEdgeIterator> :
    public Iterator<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, OutEdgeIterator> {};


//////////////////////////////////////////////////////////////////////////////
// InternalOutEdgeIterator for Directed Graph
//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
class Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >
{
public:
    typedef Graph<Hmm<TAlphabet, TCargo, TGraphSpec> > TGraph_;
    typedef typename EdgeDescriptor<TGraph_>::Type TEdgeDescriptor_;
    typedef typename VertexDescriptor<TGraph_>::Type TVertexDescriptor_;
    TGraph_ const* data_host;
    TVertexDescriptor_ data_source;
    TEdgeDescriptor_ data_edge;

    Iter()
    {
        SEQAN_CHECKPOINT
    }

    Iter(TGraph_ const& _graph, TVertexDescriptor_ const v) :
        data_host(&_graph),
        data_source(v),
        data_edge(getValue(_graph.data_model.data_vertex,v))
    {
        SEQAN_CHECKPOINT
    }

    Iter(Iter const& _iter) :
        data_host(_iter.data_host),
        data_source(_iter.data_source),
        data_edge(_iter.data_edge)
    {
        SEQAN_CHECKPOINT
    }

    ~Iter() {
        SEQAN_CHECKPOINT
    }

    Iter const&    operator = (Iter const & _other) {
        SEQAN_CHECKPOINT
        if (this == &_other) return *this;
        data_host = _other.data_host;
        data_source = _other.data_source;
        data_edge = _other.data_edge;
        return *this;
    }
//____________________________________________________________________________
};

//////////////////////////////////////////////////////////////////////////////
// Graph InternalOutEdgeIterator - Metafunctions
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec>
struct Iterator<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, OutEdgeIterator>
{
    typedef Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<OutEdgeIterator> > > Type;
};

template<typename TAlphabet, typename TCargo, typename TGraphSpec>
struct Iterator<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> > const, OutEdgeIterator> :
    public Iterator<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, OutEdgeIterator> {};


//////////////////////////////////////////////////////////////////////////////
// Graph InternalOutEdgeIterator - General Metafunctions
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TIteratorSpec>
struct Value<Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >
{
    typedef typename EdgeDescriptor<TGraph>::Type Type;
};

template<typename TGraph, typename TIteratorSpec>
struct Value<Iter<TGraph const, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >
{
    typedef typename EdgeDescriptor<TGraph const>::Type Type;
};

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TIteratorSpec>
struct Reference<Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >
{
    typedef typename Value<Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >::Type Type;
};

template<typename TGraph, typename TIteratorSpec>
struct Reference<Iter<TGraph const, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >
{
    typedef typename Value<Iter<TGraph const, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >::Type Type;
};

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TIteratorSpec>
struct GetValue<Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >
{
    typedef typename Value<Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >::Type Type;
};

template<typename TGraph, typename TIteratorSpec>
struct GetValue<Iter<TGraph const, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >
{
    typedef typename Value<Iter<TGraph const, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >::Type Type;
};

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TIteratorSpec>
struct Spec<Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >
{
    typedef TIteratorSpec Type;
};

template<typename TGraph, typename TIteratorSpec>
struct Spec<Iter<TGraph const, GraphIterator<InternalOutEdgeIterator<TIteratorSpec> > > >
{
    typedef TIteratorSpec Type;
};



//////////////////////////////////////////////////////////////////////////////
// Graph InternalOutEdgeIterator - Functions
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline typename GetValue<Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
getValue(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_edge;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline typename GetValue<Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
getValue(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_edge;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline typename GetValue<Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
getValue(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_edge;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline typename GetValue<Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
getValue(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_edge;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline typename GetValue<Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
getValue(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    typedef Graph<Automaton<TAlphabet, TCargo, TGraphSpec> > TGraph;
    TGraph * g = const_cast<TGraph*>(it.data_host);
    return (&g->data_vertex[it.data_source].data_edge[it.data_pos]);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline typename Reference<Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
value(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_edge;
}


//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline typename Reference<Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
value(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_edge;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline typename Reference<Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
value(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_edge;
}


//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline typename Reference<Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
value(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_edge;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline typename Reference<Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
value(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    typedef Graph<Automaton<TAlphabet, TCargo, TGraphSpec> > TGraph;
    TGraph * g = const_cast<TGraph*>(it.data_host);
    return (&g->data_vertex[it.data_source].data_edge[it.data_pos]);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline typename Reference<Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type
operator * (Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return value(it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline typename Host<Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > > >::Type const&
hostGraph(Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return *it.data_host;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atBegin(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_edge == getValue(it.data_host->data_vertex, it.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atBegin(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_edge == getValue(it.data_host->data_model.data_vertex, it.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atBegin(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_edge == getValue(it.data_host->data_vertex, it.data_source));
}


//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atBegin(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_edge == getValue(it.data_host->data_vertex, it.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atBegin(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_begin == it.data_pos);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goBegin(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_edge = getValue(it.data_host->data_vertex,it.data_source);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goBegin(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_edge = getValue(it.data_host->data_model.data_vertex,it.data_source);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goBegin(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_edge = getValue(it.data_host->data_vertex,it.data_source);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goBegin(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_edge = getValue(it.data_host->data_vertex,it.data_source);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goBegin(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_pos = it.data_begin;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atEnd(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_edge == 0);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atEnd(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_edge == 0);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atEnd(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_edge == 0);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atEnd(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_edge == 0);
}

/////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
atEnd(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return (it.data_end == it.data_pos);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goEnd(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_edge = 0;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goEnd(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_edge = 0;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goEnd(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_edge = 0;
}


//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goEnd(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_edge = 0;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goEnd(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    it.data_pos = it.data_end;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goNext(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    if (!atEnd(it)) it.data_edge = getNextT(it.data_edge);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goNext(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    if (!atEnd(it)) it.data_edge = getNextT(it.data_edge);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goNext(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    if (!atEnd(it)) it.data_edge = getNextT(it.data_edge);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goNext(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    if (!atEnd(it)) {
        if (it.data_source == getSource(it.data_edge)) it.data_edge = getNextS(it.data_edge);
        else it.data_edge = getNextT(it.data_edge);
    }
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goNext(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    typedef Graph<Automaton<TAlphabet, TCargo, TGraphSpec> > TGraph;
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor;
    TVertexDescriptor nilVal = getNil<TVertexDescriptor>();
    if (it.data_pos < it.data_end) ++it.data_pos;
    while (    (it.data_pos < it.data_end) &&
            (it.data_host->data_vertex[it.data_source].data_edge[it.data_pos].data_target == nilVal))
    {
                ++it.data_pos;
    }
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >&
operator ++(Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
SEQAN_CHECKPOINT
    goNext(it);
    return it;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >
operator ++(Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it, int)
{
    SEQAN_CHECKPOINT
    Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > > ret = it;
    goNext(it);
    return ret;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goPrevious(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    typedef typename EdgeType<Graph<Directed<TCargo, TGraphSpec> > >::Type TEdge;
    TEdge* current = getValue(it.data_host->data_vertex, it.data_source);
    if (current == it.data_edge) return;
    while ((current != 0) && (getNextT(current) != it.data_edge)) current = getNextT(current);
    it.data_edge = current;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goPrevious(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    typedef typename EdgeType<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> > >::Type TEdge;
    TEdge* current = getValue(it.data_host->data_model.data_vertex, it.data_source);
    if (current == it.data_edge) return;
    while ((current != 0) && (getNextT(current) != it.data_edge)) current = getNextT(current);
    it.data_edge = current;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goPrevious(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    typedef typename EdgeType<Graph<Tree<TCargo, TGraphSpec> > >::Type TEdge;
    TEdge* current = getValue(it.data_host->data_vertex, it.data_source);
    if (current == it.data_edge) return;
    while ((current != 0) && (getNextT(current) != it.data_edge)) current = getNextT(current);
    it.data_edge = current;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goPrevious(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    typedef Graph<Undirected<TCargo, TGraphSpec> > TGraph;
    typedef typename EdgeType<TGraph>::Type TEdge;
    TEdge* current = getValue(it.data_host->data_vertex, it.data_source);
    if (current == it.data_edge) return;
    while (current != 0) {
        if (it.data_source == getSource(current)) {
            if (it.data_edge == getNextS(current)) break;
            else current = getNextS(current);
        } else {
            if (it.data_edge == getNextT(current)) break;
            else current = getNextT(current);
        }
    }
    it.data_edge = current;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline void
goPrevious(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    typedef Graph<Automaton<TAlphabet, TCargo, TGraphSpec> > TGraph;
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor;
    TVertexDescriptor nilVal = getNil<TVertexDescriptor>();
    if (it.data_pos != it.data_begin) --it.data_pos;
    while (    (it.data_pos != it.data_begin) &&
            (it.data_host->data_vertex[it.data_source].data_edge[it.data_pos].data_target == nilVal))
    {
                --it.data_pos;
    }
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >&
operator --(Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    goPrevious(it);
    return it;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >
operator --(Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it, int)
{
    SEQAN_CHECKPOINT
    Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > > ret = it;
    goPrevious(it);
    return ret;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator ==(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_edge==it2.data_edge) &&
            (it1.data_source==it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator ==(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_edge==it2.data_edge) &&
            (it1.data_source==it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator ==(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_edge==it2.data_edge) &&
            (it1.data_source==it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator ==(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_edge==it2.data_edge) &&
            (it1.data_source==it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator ==(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_pos==it2.data_pos) &&
            (it1.data_source==it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator !=(Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Directed<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_edge!=it2.data_edge) ||
            (it1.data_source!=it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator !=(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_edge!=it2.data_edge) ||
            (it1.data_source!=it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator !=(Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Tree<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_edge!=it2.data_edge) ||
            (it1.data_source!=it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator !=(Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Undirected<TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_edge!=it2.data_edge) ||
            (it1.data_source!=it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline bool
operator !=(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it1,
            Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it2)
{
    SEQAN_CHECKPOINT
    return ((it1.data_pos!=it2.data_pos) ||
            (it1.data_source!=it2.data_source));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline typename VertexDescriptor<TGraph>::Type
sourceVertex(Iter<TGraph, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_source;
}

//////////////////////////////////////////////////////////////////////////////

/*!
 * @fn OutEdgeIterator#label
 * @brief Returns the label of the out-edge this iterator points to (for automatons);
 *
 * Only works if the graph type is an @link Automaton @endlink.
 *
 * @signature TAlphabet label(it);
 *
 * @param[in] it The iterator to query.
 *
 * @return TAlphabet The current label (Alphabe is the alphabet of the automaton).
 */

/*!
 * @fn EdgeIterator#label
 * @brief Returns the label of the out-edge this iterator points to (for automatons);
 *
 * Only works if the graph type is an @link Automaton @endlink.
 *
 * @signature TAlphabet label(it);
 *
 * @param[in] it The iterator to query.
 *
 * @return TAlphabet The current label (Alphabe is the alphabet of the automaton).
 */

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline typename Alphabet<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> > >::Type
label(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    return TAlphabet(it.data_pos);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline typename VertexDescriptor<Graph<Directed<TCargo, TGraphSpec> > >::Type
targetVertex(Iter<Graph<Directed<TCargo, TGraphSpec> > , GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return targetVertex(*it.data_host, it.data_edge);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline typename VertexDescriptor<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> > >::Type
targetVertex(Iter<Graph<Hmm<TAlphabet, TCargo, TGraphSpec> > , GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return targetVertex(*it.data_host, it.data_edge);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline typename VertexDescriptor<Graph<Tree<TCargo, TGraphSpec> > >::Type
targetVertex(Iter<Graph<Tree<TCargo, TGraphSpec> > , GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return targetVertex(*it.data_host, it.data_edge);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TGraphSpec, typename TSpec>
inline typename VertexDescriptor<Graph<Undirected<TCargo, TGraphSpec> > >::Type
targetVertex(Iter<Graph<Undirected<TCargo, TGraphSpec> > , GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    typedef Graph<Undirected<TCargo, TGraphSpec> > TGraph;
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor;
    TVertexDescriptor target = targetVertex(*it.data_host, it.data_edge);
    if (target != it.data_source) return target;
    else return sourceVertex(*it.data_host, it.data_edge);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TGraphSpec, typename TSpec>
inline typename VertexDescriptor<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> > >::Type
targetVertex(Iter<Graph<Automaton<TAlphabet, TCargo, TGraphSpec> >, GraphIterator<InternalOutEdgeIterator<TSpec> > >& it)
{
    SEQAN_CHECKPOINT
    return it.data_host->data_vertex[it.data_source].data_edge[it.data_pos].data_target;
}

}// namespace SEQAN_NAMESPACE_MAIN

#endif //#ifndef SEQAN_HEADER_...
