Re: [Boost-users] Misuse of shared_ptr?

From: Serge Skorokhodov (serge.skorokhodov_at_[hidden])
Date: 2006-01-08 05:25:02

Pooyan McSporran wrote:
> (Using gcc 4.0.2, boost 1.33.1, linux)>
> I've got a program which causes segfaults using shared_ptr.  I've reduced
> the program as far as I can to show the fault without any extra fluff.  It
> looks as if an object pointed to by a shared_ptr is being deleted more than
> once.

<skip>

>   void test (MemoryPtr m) {
>     m -> remember1 (FooPtr (this));

Definetely a misuse. A poiner to a "newed" object or another
shared_ptr must be passed to share_ptr ctor. Actually, you are
baypassing reference counting here. "this" is neither:( Try this:

void test ( MemoryPtr m, FooPtr f )
{
  m->remember1( f );
}

>   }

<skip>

> int main ()
> {
>   {
>     FooPtr f1 (new Foo ("first"));
>     MemoryPtr m1 (new Memory ());
>     f1 -> test (m1);

and here:
      f1->test (m1, f1);

>   }
> 
>   return EXIT_SUCCESS;
> }