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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/46174] [OOP] ALLOCATE with SOURCE: Deep copy missing
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46174

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |domob at gcc dot gnu.org

--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> 2010-10-26 13:27:11 UTC ---
Possible implementation scheme:  vtab$t contains besides the normal type-bound
procedures and init/size/hash also an two function points: $copy and $free,
which are of the kind:

void $free (struct *DT) {
  ... free derived types
  if (DT->$vtab->$extends && DT->$vtab->$extends->$free)
    DT->$vtab->$extends->$free (DT)
}

That is, each effective type cleans up its own allocatable components and moves
on to the parent. If the parent does not have an allocatable component itself,
the $free pointer directly points to an ancestor which has -- or is NULL if no
such ancestor exists.  The $copy version works alike.