[RESOLVED] Equivalance Typeof Operator Suggestion

[Peter_APIIT]

Hello to all expert, i have a class template like this.

template <typename T, class edgeType>
class graph;

I would like to implement MF differently when different type of edgeType is supplied, for instance, arcs was supplied, then i identify this as directed graph and i just insert one set of edge.

If edge, then i insert two sets of edge.

Any typeof operator in C++ STL ?

Thanks.

[JohnW@Wessex]

Partial specialisation?

struct arcType
{
};

template <typename T, class edgeType>
class graph
{
};

template <typename T>
class graph<T, arcType>
{
};

[GNiewerth]

There´s a typeid operator that relies on RTTI and provides type information at runtime. Providing specialized templates allows compile time decision, and that´s probably what you want.
You can´t specialize member templates and you can´t partially specialize non member function, but you can use a (partially) specialized inserter template.

// generic Edge Inserter
template<typename Container, typename EdgeType>
struct EdgeInserter
{
   void operator()( Container& c, const EdgeType& e )
   {
      // insert edge into container 
      c.push_back( e );
   }
};

// specialized Edge Inserter
template<typename Container>
struct EdgeInserter<Container,Arc>
{
   void operator()( Container&c, const Arc& a )
   {
      // insert arc into container
      c.push_back( a );
   }
};


template<typename T, typename EdgeType>
struct graph
{
   EdgeInserter<EdgeContainerType,EdgeType> Inserter;

   // Container to hold edges (whatever this is)
   EdgeContainerType Edges;

   void add_edge( const EdgeType& NewEdge )
   {
      // use inserter to add edge
      Inserter( Edges, NewEdge );
   }
};

[Russco]

Boost has a typeof macro. gcc supports it natively and its emulated elsewhere. Its here.

[Peter_APIIT]

GNiewerth, wonder approach. I will try it out when i come back from university.

A billion thanks to you.

[Peter_APIIT]

I think a bit shorter if you use functor CT polymorphism.
My approach will be a Non MF that called appropriate MF.

Question 1:
What is the pro and cons using functor CT polymorphism ?

The thinking logic is from based on the edge type then coded different implement strategy.
I never think this out. Now i know.

A billion thanks for your help.