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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Interfacing to C library...
References: <pan.2002.11.02.05.14.57.594236@jps-nospam.net>
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> struct foo { ... }
> long pass_by_value (struct foo);
  Most of the time structs are passed by copy they are probably small (it
being usually unreasonable to copy large objects).  So an
Unchecked_Conversion to Interfaces.C.Int, or Interfaces.C.Double, will do
what you want.
  If not, and you are using Gnat, look up Pragma C_Pass_By_Copy in the
gnat_rm.html document.  For other Ada compilers, look in their docs.