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From: mnm@hpclove.HP.COM (Michey Mehta)
Newsgroups: comp.lang.c++
Subject: vtable sharing in cfront
Message-ID: <1250003@hpclove.HP.COM>
Date: 1 Sep 89 19:27:28 GMT
Organization: Hewlett Packard Calif. Language Lab
Lines: 20



I recently took a C++ course at UC Santa Cruz which was taught by
Stroustrup.  During this course, he mentioned that if a class needs a
virtual function table, this table is defined in only one file (this
is the file which contains the definition of the first virtual member
function); all other files will just have an extern declaration of
this vtable.  This is a new feature of 2.0.  I have two questions
about this:

1. He also mentioned a corner case in which multiple vtable
   definitions might still be emitted for the same class; does anyone
   know what this corner case is?

2. In light of this feature, what do the +e0 and +e1 options do
   in 2.0?

--
Michey Mehta  -- Hewlett Packard California Language Lab
Internet: mnm@hpda.hp.com          UUCP: hplabs!hpda!mnm