Conventions on struct copying?

I'm still working on the struct object_id patches, and I had a style
question.  In several places throughout the code, we do something like
this:

  unsigned char a[20], b[20];

  /* do some stuff with b */
  hashcpy(a, b);

I could implement an oidcpy that does the same thing.

  struct object_id a, b;

  /* do some stuff with b */
  oidcpy(&a, &b);

Or I could just write that as:

  a = b;

and let the compiler do the heavy lifting.  Is there any reason that
we'd want the function for that purpose, or is it okay to just use the
assignment?  I don't know of any place we explicitly copy structs like
this, but I don't know of any prohibition against it, either.

-- 
brian m. carlson / brian with sandals: Houston, Texas, US
+1 832 623 2791 | http://www.crustytoothpaste.net/~bmc | My opinion only
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