Associate MeshTags with Topology (and not Mesh)
#2607
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garth-wells
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MeshTags with Topology (and not Mesh).MeshTags with Topology (and not Mesh)
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MeshTags data is defined on mesh entities (topology), and not a full mesh, i.e. geometry plays no role. The PR makes MeshTags depend on
Topologyand notMesh. This avoidsMeshTagshaving to be templated over the geometry scalar type.To make this work, a
Meshnow holds a shared pointer to its topology, allowing the topology to be shared with a MeshTags. This has the additional benefit of allowing meshes with different geometry scalar types to share a common topology.Fixes #2601.