How would someone do that? for example:
Client* client = it->second;
where it->second is a boost::shared_ptr to Client error:
cannot convert `const Cli开发者_如何转开发entPtr' to `Client*' in initialization
boost::shared_ptr has a .get() method to retrieve the raw pointer.
Documentation here about when and why not to use it: http://www.boost.org/doc/libs/1_44_0/libs/smart_ptr/shared_ptr.htm
You can use the get
method on the boost::shared_ptr
to retrieve the pointer, but be very careful in what you do : extracting a naked pointer from a reference counted shared pointer can be dangerous (deletion will be triggered if the reference count reaches zero, thus invalidating your raw pointer).
boost:shared_ptr
overloads operator*
:
boost::shared_ptr< T > t_ptr(new T());
*t_ptr; // this expression is a T object
To get a pointer to t
you can either use get
function or take *t_ptr
address:
&*t_ptr; // this expression is a T*
The first method (using get
) is probably better, and has less overhead, but it only works with shared_ptr
s (or pointers with a compatible API), not with other kind of pointers.
Not dangerous but c-ctor involved.
Client client( *(it->second.get()) );
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