Re: [Boost-users] [shared_ptr] deleter that destroys shared_ptr - is itsafe?

Subject: Re: [Boost-users] [shared_ptr] deleter that destroys shared_ptr - is itsafe?
From: Peter Dimov (pdimov_at_[hidden])
Date: 2009-09-08 18:21:55

Igor R wrote:
> Hello,
> 
> Is the following code legal and safe -
> a) according to the shared_ptr specs

I think so. There is nothing in the specs that prohibits it.

> b) with the current boost::shared_ptr implementation

It should be fine. shared_ptr_test contains a similar test case:

namespace n_report_1
{

class foo
{ 
public: 

    foo(): m_self(this)
    {
    } 

    void suicide()
    {
        m_self.reset();
    }

private:

    boost::shared_ptr<foo> m_self;
}; 

void test()
{
    foo * foo_ptr = new foo;
    foo_ptr->suicide();
} 

} // namespace n_report_1

> struct a
> {
>  a() : p_(this, mem_fn(&a::delete_me))
>  {}
>  void reset()
>  {
>    p_.reset();
>  }
>  void delete_me()
>  {
>    delete this;
>  }
> 
>  shared_ptr<a> p_;
> };
> 
> 
> int main()
> {
>  a* p = new a;
>  p->reset();
> }