vcl::HasEdges Concept Reference

HasEdges concepts is satisfied when at least one of its template types is (or inherits from) a vcl::mesh::EdgeContainer. It can be used both to check if a Mesh has edges, or if in a list of types there is a EdgeContainer. More...

#include <vclib/concepts/mesh/containers/edge_container.h>

Concept definition

template<typename... Args>
concept vcl::HasEdges =  (mesh::HasEdgeContainer<Args> || ...)

Detailed Description

HasEdges concepts is satisfied when at least one of its template types is (or inherits from) a vcl::mesh::EdgeContainer. It can be used both to check if a Mesh has edges, or if in a list of types there is a EdgeContainer.

In the following example, a MyMesh type can be instantiated only if one of its template Args is a EdgeContainer:

template <typename... Args> requires HasEdges<Args...>
class MyMesh {
    // ...
};
 
// ...
 
MyMesh<vcl::VertexContainer<MyVertex>> m1; // not ok
MyMesh<vcl::EdgeContainer<MyEdge>> m2; // ok
MyMesh<vcl::VertexContainer<MyVertex>, vcl::EdgeContainer<MyEdge>> m3; // ok

To check if a type has (inherits from) EdgeContainer:

if constexpr (vcl::HasEdges<MyMeshType>) {
    // ...
}

Note

This concept does not check if a Mesh is a valid EdgeMesh. To do that, use the vcl::EdgeMeshConcept.