Switch for uniform treatment of finite element with either the local or the global interface.
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template<class FiniteElement, class Dummy = void>
struct Dune::FiniteElementInterfaceSwitch< FiniteElement, Dummy >
Switch for uniform treatment of finite element with either the local or the global interface.
- Template Parameters
-
FiniteElement | Type of the finite element to handle. |
Dummy | Dummy parameter for enable_if. This must be left at the default value of void . |
- Note
- The local interface is detected by the presence of the type FiniteElement::Traits::LocalBasisType.
template<class FiniteElement , class Dummy = void>
Type for storing finite elements.
Some algorithms use one variable to store (a pointer) a finite element and update that pointer while iterating through the grid. This works well for local finite elements, since they exists in a finite number of variants, which can be stored somewhere and don't need to change for the duration of the algorithm, so we can always store a simple pointer. For global finite elements we have to store the object itself however, and we must make sure that we destroy the object when we are done with it. Since global finite elements are not assignable in general, we needs to copy-construct them for each grid element we visit.
To accommodate both interfaces, we define a store: for local finite elements it is a simple pointer, and if we want to store a finite element in it we simply store its address. For global finite elements we use a shared_ptr, and if we want to store a finite element in it we allocate a new object and initialise it with the copy-constructor. For local finite elements we don't need to do anything when we are done with it, global finite elements are automatically destructed by the shared_ptr when we store a new one or when the shared_ptr itself is destroyed. Access to the finite element is done by simply dereferencing the store in both cases.