Re: shared_ptr swap problems

From: Olaf Petzold (yg-boost-users_at_[hidden])
Date: 2002-08-26 10:18:37

Thank you,

>> struct C : public BaseC {
>>   C() : b( new B("C::b") ) { }
>>   void set(const boost::shared_ptr<A>& ptr) {
>>     b.swap( boost::shared_static_cast<B>( ptr ) ); // L21
>>   }
>>   void print() { std::cout << b->name << std::endl; }
>>   boost::shared_ptr<B> b;
>> };
> 
> Why not simply
> 
> b = boost::shared_static_cast<B>( ptr );
> 
> or
> 
> 
> b = boost::shared_polymorphic_cast<B>( ptr );

I want to swap the pointers inside for further use (for saving the old ptr 
contents and restoring for circumstances - clone() may be one way before 
set() it but has overhead).

Regards
Olaf