adding destroyable objects into Ggc

[Basile Starynkevitch]

On Thu, 20 Oct 2011 15:52:25 +0100
Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
> 
> Well you haven't showed concrete examples of your C++-friendly Ggc
> either (your suggested code wasn't valid C++).  


>From the C++ side, it probably will be just an operator new, perhaps something as simple
as (untested code):

  class ggc_new {}; // an empty class
  extern ggc_new the_ggc_new;

  void* operator new (ggc_new);
  #define new_ggc new(the_ggc_new)

So to allocate a GTY-ed instance of a class Foo, we might have, assuming we have defined:
  class GTY((...)) Foo { ... };
we would code
   new_ggc Foo (...)

with the important convention that data allocated with with new_ggc should never be
explicitly deleted, except implicitly by the Ggc garbage collector, and that its
destructor should not allocate Ggc data.

Does the above description answers your question?

(I'm not sure to have time implement that, and I'm not sure of the details)

Cheers.

-- 
Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
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