[petsc-dev] Error checking on input only vectors

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> I think Barry is only suggesting we save the state integer.

That's okay, but if we add that, it should only be a warning for a
while.  Fortran (77) can't enforce this constness and none of the
examples use VecGetArrayReadF90 yet.  Plenty of users may have internal
interfaces that are reused between const and non-const usage, so
requiring VecGetArrayRead could cascade into lots of their internal
interfaces.
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