On 3/7/21 7:22 AM, [email protected] wrote:

/usr/local/include/deal.II/hp/fe_collection.h:469:77: error: static assertion failed: Not all of the input arguments of this function are derived from FiniteElement<dim,spacedim>!   469 |     static_assert(is_base_of_all<FiniteElement<dim, spacedim>, FETypes...>::value, | ^~~~~ /usr/local/include/deal.II/hp/fe_collection.h:478:7: error: cannot convert ‘const int’ to ‘const dealii::FiniteElement<2, 2>&’

This is the key point. You declare 'fe' as an hp::FECollection but then initialize it via
    fe(1),
What the error message says is that you can't initialize an hp::FECollection with just an int -- you need a finite element as an argument.

Best
 W.

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Wolfgang Bangerth          email:                 [email protected]
                           www: http://www.math.colostate.edu/~bangerth/

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