[Dune] [#577] Introduce method update() for GridViews

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FS#577 - Introduce method update() for GridViews
User who did this - Carsten Gräser (Carsten)

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We in Berlin use FunctionSpaceBasis classes which store a gridview and should survive adaptation cycles. Currently they must assume that the gridview remains valid (which is true for LeafGridViews).

@Christian: No, you don't get more update methods since you only store a reference to one indexset, while you store copies of gridviews.

@Martin: For me it is not the question if the grid has changed. In general the application nows this and could call update to FunctionSpace/Basis/whatever object. The difficult thing is that there is no generic way to get a new up to date gridview of the same type.

Thus it is not possible to write generic code that can safely survive an adaptation cycle. Without the update() method you have to recreate a gridview using the appropiate grid method by hand and hand it to every object that needs one.
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