Re: [Boost-users] how can I return a 'null' smart pointer?

Marshall Clow skrev:

At 4:43 PM -0500 7/14/08, Meryl Silverburgh wrote:

...

Hi,

Can you please tell me how can I return a 'null' smart pointer?

typedef shared_ptr<MyA> MyAPtr; typedef vector<MyAPtr> MyAVector;

For example,I have this code, which return NULL in an error situation:

MyAPtr myfunction(MyAVector& v, int size) { if (index < v.size()) { return v[index]; } else { // how can I return NULL here? } }

How can I achieve that when I use boost smart pointer?

I suggest that you throw an exception here, rather than returning some bogus value.

I concur, but I suggest you simply add a precondition: assert( index < v.size() ) -Thorsten