petsc-3.12.5 2020-03-29

PetscNot

negates a logical type value and returns result as a PetscBool

This is useful in cases like

    int        *a;

    PetscBool  flag = PetscNot(a)

where !a would not return a PetscBool because we cannot provide a cast from int to PetscBool in C.

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