Re: [Boost-users] delaying destructor compile on imcomplete type

From: Peter Dimov (pdimov_at_[hidden])
Date: 2006-06-08 05:46:36

Gottlob Frege wrote:
> IIRC, one of boost's smart ptrs can be used with an incomplete type.
> How is the compile of the destructor delayed?
> 
> ie
> 
> ~my_smart_ptr()
> {
>   get()->~T();  // error: T is an incomplete type
> }

In pseudocode, something along the lines of:

class my_smart_ptr
{
    T * p;
    void (*f)( T* );

    my_smart_ptr( T* p ): p( p ), f( &delete ) {}
    ~my_smart_ptr() { f(p); }
};

> I wondered through lots of the shared_ptr code, but I got a bit
> bleary-eyed.  On that note, does anyone have a script or
> preprocessor call or something that converts all the boost code into
> the 'clean and ideal boost'?  ie the one without the layers and
> layers of compiler workarounds, etc?

shared_ptr doesn't have _that_ many compiler workarounds. :-)