Hi,
it is c-style *switch* replacement, to simplify statements like this:

transport       = &if (&eq('@cycle@', '1'), '@btl_openib@' ,\
                     &if (&eq('@cycle@', '2'), '@btl_openib@',\
                       &if (&eq('@cycle@', '3'), '@btl_eth10g@',\
                         &if (&eq('@cycle@', '4'), '@btl_eth10g@',\
                           &if (&eq('@cycle@', '3a'), '@btl_eth10g@ -x custom_noswitchconnect=1',\
                             &if (&eq('@cycle@', '4a'), '@btl_eth10g@ -x custom_noswitchconnect=1',\
                               &if (&eq('@cycle@', '5'), '@btl_eth10g@',\
                                 &if (&eq('@cycle@', '6'), '@btl_eth10g@',\
                                   &if (&eq('@cycle@', '7'), '@btl_eth10g@',\
                                     &if (&eq('@cycle@', '8'), '@btl_eth10g@',\
                                       &if (&eq('@cycle@', '11'), '@btl_eth10g@',\
                                         &if (&eq('@cycle@', '12'), '@btl_eth10g@',\
                                           '@btl_rdmaoe@'\
                                         )\
                                       )\
                                     )\
                                   )\
                                 )\
                               )\
                             )\
                           )\
                         )\
                       )\
                    )\
                  )

which can be rewritten as:

transport = mtt_switch(@cycle@, 1, @btl_openib@, 2, @btl_eth10g@, ...)

Will update wiki as well.

Regards

On Mon, Jan 3, 2011 at 2:54 PM, Jeff Squyres <jsquyres@cisco.com> wrote:

Mike --

Can you explain this one a little? I don't understand the example you gave in the comment.

Also, are you adding all the new funclets to the wiki documentation?

On Dec 29, 2010, at 3:52 AM, miked@osl.iu.edu wrote:

> Author: miked
> Date: 2010-12-29 03:52:24 EST (Wed, 29 Dec 2010)
> New Revision: 1377
> URL: https://svn.open-mpi.org/trac/mtt/changeset/1377
>
> Log:
> added mtt_switch to simplify if-then-else cases in ini files
>
> Text files modified:
> trunk/lib/MTT/Values/Functions.pm | 21 +++++++++++++++++++++
> 1 files changed, 21 insertions(+), 0 deletions(-)
>
> Modified: trunk/lib/MTT/Values/Functions.pm
> ==============================================================================
> --- trunk/lib/MTT/Values/Functions.pm (original)
> +++ trunk/lib/MTT/Values/Functions.pm 2010-12-29 03:52:24 EST (Wed, 29 Dec 2010)
> @@ -3163,4 +3163,25 @@
> return $x->{result_stdout};
> }
>
> +#
> +# Poor man switch statement
> +# Example: mtt_switch(@np@, 9, "return1", 100, return2", "default", 0);
> +#
> +
> +sub mtt_switch
> +{
> + my ($var, %cases) = @_;
> +
> + if ($cases{$var}) {
> + return $cases{$var};
> + }
> +
> + if ($cases{'default'}) {
> + return $cases{'default'};
> + }
> +
> + Debug("ERROR: Not found case for $var\n");
> +}
> +
> +
> 1;
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> mtt-svn@open-mpi.org
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--
Jeff Squyres
jsquyres@cisco.com
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