[Boost-users] [shared_ptr] boost::shared_ptr deleter question

Subject: [Boost-users] [shared_ptr] boost::shared_ptr deleter question
From: Tamas.Ruszkai_at_[hidden]
Date: 2015-08-14 05:07:53

Hi All,

I wonder when the shared_ptr deleter is destroyed.

I have a shared_ptr with a custom deleter. I would expect when the last 
shared pointer to the object is gone then not only the deleter method will 
be called, but the deleter function object is also released. As I see the 
deleter is taken by value and stored by value in the reference counter, so 
I do not understand what is going on.

How is the deleter mean to be freed?

Thanks,
Tamas

struct MyClassDeleter
{
        ~MyClassDeleter()
        {
                // Break point is set here
        }

        void operator()(MyClass* item)
        {
                // Break point is set here
        }
}

{
        auto sharedPtr = boost::shared_ptr<MyClass>(new MyClass, 
MyClassDeleter)
}

// shared_ptr leaves the scope here, the custom deleter is called 
(parenthesis operator)
// the deleter instance is however not destroyed, the breakpoint in the 
destructor does not hit