[petsc-dev] Detecting MPI_C_DOUBLE_COMPLEX when clanguage!='C'

[Jed Brown]

    if self.getDefaultLanguage() == 'C':
mpitypes.extend([('MPI_C_DOUBLE_COMPLEX', 'c-double-complex')])

Why don't we check for this regardless of C language? The C and C++ types
are binary compatible and there is an advantage to using the predefined
data types: it lets us also use the predefined MPI_Ops, which would let us
use MPIU_SUM with PetscSF (and possibly use more optimized reduction
implementations in other cases).
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