On Mon, 18 Aug 2014, John Peterson wrote:
> Are you sure it works for broadcast? I tried this test code:
>
> #include "libmesh/libmesh.h"
> #include "libmesh/point.h"
> #include "libmesh/parallel.h"
#include "libmesh/parallel_algebra.h"
> using namespace libMesh;
>
> int main (int argc, char** argv)
> {
> LibMeshInit init(argc, argv);
>
> // Let's try to broadcast a libMesh Point
> Point p;
>
> // Initialize p only on processor 0
> if (init.comm().rank() == 0)
> p(0) = 42;
>
> Parallel::broadcast(p);
>
> return 0;
> }
And then it works.
I can't figure out what a more user-friendly way to handle this would
be, though. I definitely don't want to add a point.h dependency to
parallel.h or vice-versa.
Maybe
#include "libmesh/combinations.h", which is full of stuff like
#if defined(LIBMESH_PARALLEL_H) && (defined(LIBMESH_POINT_H) ||
defined(LIBMESH_TYPE_VECTOR_H) || defined(LIBMESH_TYPE_TENSOR_H) )
# include "libmesh/parallel_algebra.h"
#endif
? But then we'll end up compiling a bunch of unnecessary
joint-dependencies every time someone needs a single combination.
Down that road lies '#include "libmesh/everything.h"'.
If John couldn't figure this out, and I couldn't figure this out at
first glance *despite having written the code* then it's clearly a
problem, but I have no idea how to solve it properly. My stuff in
MetaPhysicL is just as bad, with "foo.h", "bar.h", etc. for various
classes with no mutual dependencies, but "foo_bar.h", "foo_bar_baz.h"
etc. required to disambiguate template specializations when you want
to combine those classes.
---
Roy
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