RE: [Boost-users] Re: Using shared_ptr across shared library boun dary

From: Ferdinand Prantl (ferdinand.prantl_at_[hidden])
Date: 2004-03-12 04:35:57

> From: David Abrahams [mailto:dave_at_[hidden]] 
> > "Jim.Hyslop" <Jim.Hyslop_at_[hidden]> writes:
> > It's been my experience
> > (with Visual Studio, at least) that allocating memory in 
> > one DLL and 
> > deallocating it in another leads to problems. Sometimes it 
> > doesn't go 
> > noticed, but when it does, it's really noticeable.
> 
> The library cleverly avoids that, provided the first 
> shared_ptr to take ownership of the memory does so in the 
> same DLL where the object was allocated.

Actually, I came into the same problem as Jim - I had to
ensure the same version of the msvcrt and moreover its
debug/release versions to get the code working well.

All classes in checked_delete.hpp, smart_count.hpp and shared_ptr.hpp
are either templates or completely in headers. The operations with
new/delete and allocators are translated/inlined by the compiler into
every unit, IMHO.

I could not find the trick in the implementation, how to force
the deletion of the pointer by the same runtime, if new() was
performed in one DLL and delete() in another one. Could you, please,
point me to the right direction to the explatation?

Thanks,
Ferda