Re: [Boost-users] shared_ptr as reference argument

Subject: Re: [Boost-users] shared_ptr as reference argument
From: Igor R (boost.lists_at_[hidden])
Date: 2009-03-19 13:13:58

> Corrected example could be:
>
>
> struct Bar
> {
>
> Â  explicit Bar(shared_ptr<int> const& data)
> Â Â Â Â Â  : data_(data)
> Â  {}
>
> Â  ~Bar()
> Â  {
> Â  Â  Â  *data_ = 100;
> Â  }
>
>
> private:
> Â  shared_ptr<int> const& Â Â Â Â Â  data_;
> };
>
>
> //possible misuse
> void foo()
> {
> Â Â Â Â  shared_ptr<int> ptr = shared_ptr<int>(new int(10));
> Â Â Â Â  Bar bar(ptr);
>
> Â Â Â Â  ptr.reset();
>
> } //Â  BOOM!!! => ptr is destroyed before the Bar::~Bar() is called

Well, the problem here is *storing* a reference - not a passing param
by (const) reference.