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Re: adding destroyable objects into Ggc

On 18 October 2011 19:03, Basile Starynkevitch wrote:
> On Tue, 18 Oct 2011 18:53:07 +0100
> Jonathan Wakely <> wrote:
>> On 18 October 2011 16:12, Basile Starynkevitch wrote:
>> >
>> > Of course, with C++, the destructor routine is really what C++ calls a destructor, e.g
>> > something like extern "C" void my_destructor_for_class_C (class C* p)
>> > { delete (p) p; // call the placement version of operator delete, from <new> C++ library
>> > header. }
>> Why not just call the destructor?
>> ? ?p->~C()
> You are right. But I was also thinking of giving a C ABI to these destructors.

Yes, I understand that, I wasn't talking about the C interface.

I assume you haven't tried to compile your suggested code, because
1) your destructor function doesn't match the ggc_destructor_t signature.
2) you can't call placement delete like that
3) the placement delete in <new> is a no-op

You probably want something like this:

extern "C" void my_destructor_for_class_C (void* p)
{ static_cast<C*>(p)->~C(); }

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