parent_mesh_pointer.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
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 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
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 ****************************************************************************/
 
#ifndef VCL_MESH_COMPONENTS_PARENT_MESH_POINTER_H
#define VCL_MESH_COMPONENTS_PARENT_MESH_POINTER_H
 
namespace vcl::comp {
 
template<typename MeshType>
class ParentMeshPointer
{
    MeshType* mParent = nullptr;
 
public:
    using ParentMeshType = MeshType;
 
    ParentMeshPointer() {}
 
    // copy and move semantics: nothing will be done here
    // this instance will be updated only by the mesh, and optional data
    // can be accessed only when an element is part of a mesh
    ParentMeshPointer(const ParentMeshPointer<MeshType>&) {}
 
    ParentMeshPointer(ParentMeshPointer<MeshType>&&) {}
 
    ParentMeshPointer& operator=(const ParentMeshPointer<MeshType>&)
    {
        return *this;
    }
 
    constexpr MeshType* parentMesh() { return mParent; }
 
    constexpr const MeshType* parentMesh() const { return mParent; }
 
protected:
    void setParentMesh(void* parentMesh)
    {
        mParent = static_cast<MeshType*>(parentMesh);
    }
};
 
} // namespace vcl::comp
 
#endif // VCL_MESH_COMPONENTS_PARENT_MESH_POINTER_H