On Tue, Jul 15, 2008 at 3:26 AM, Thorsten Ottosen <thorsten.ottosen@dezide.com> wrote:
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.
You mention "I suggest that you throw an exception here, rather than returning some bogus value." So when I do this: shared_ptr<MyClass> aPtr; and then I check for 'null' , like this: if (aPtr == NULL) { // will it return true here? }
I concur, but I suggest you simply add a precondition:
assert( index < v.size() )
-Thorsten _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users