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Marcus Mohr authored
This adds a multElementwise() method to the DGFunction class and extends the associated FunctionMultElementwiseTest. For this to work smoothly the commit also performs the following two updates on the DGFunction: - it adds an assign() version for a constant value - it changes the interface of the other assign() method for functions to use a vector of reference wrappers instead of a vector of pointers so that it is consistent with assign in the other function classes, like P1Function etc.
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