CODEWITHSUNDEEP
c#.nettemplates
David Jiménez Martínez
David Jiménez Martínez

Reputation: 3111

How to properly do a template of a templated class?

I have the following definitions for a class (I'm working with graphs, trying to work with them in a Generic Way).

public class SparseGraph<NodeType, EdgeType> : IGraphType<NodeType, EdgeType>
where NodeType : INode
where EdgeType : IEdge
{
...
}

public class ConcreteNode : INode
{
...
}

public class ConcreteEdge : IEdge
{
...
}

public class PathFinder<GraphType, NodeType, EdgeType> where GraphType<NodeType, EdgeType> : IGraphType<NodeType, EdgeType>
where NodeType : INode
where EdgeType : IEdge
{
...

...
}

Every time I have to instantiate the PathFinder class i.e. for a SparseGraph, I have to do it by using the following declaration:

var a = new PathFinder<SparseGraph<ConcreteNode, ConcreteEdge>, ConcreteNode, ConcreteEdge>()

The PathFinder class has a template of a template. Personally I dislike this kind of "redundancy" on this type instantiation. Is there any way to reduce the signature of the class PathFinder to something like "public class PathFinder"?

Upvotes: 1

Views: 65

Answers (2)

ilitirit
ilitirit

Reputation: 16352

Inherit from 

PathFinder<SparseGraph<ConcreteNode, ConcreteEdge>, ConcreteNode, ConcreteEdge>

ie.

public class NewClass : PathFinder<SparseGraph<ConcreteNode, ConcreteEdge>, ConcreteNode, ConcreteEdge>

Upvotes: 2

Vae
Vae

Reputation: 91

Personally I would implement more specific sub types for each of the common cases you are using, for example in the case of a "SparseGraph"

public class SparseGraphPathFinder : PathFinder<SparseGraph<ConcreteNode, ConcreteEdge>, ConcreteNode, ConcreteEdge>
{

}

Upvotes: 2

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