Hi,
In the following program...
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
class A {};
int main ()
{
boost::shared_ptr<A> x; // A: bad_weak_ptr thrown
// boost::shared_ptr<A> x ((A *) 0); // B: works
boost::weak_ptr<A> y (x);
boost::shared_ptr<A> z (y);
}
... I observe that with line A included (but not line B), a bad_weak_ptr
is thrown by the line which declares z.
With line B included (but not line A), all is well.
>From looking at the boost source, it seems that line A results in a
shared_ptr to nothing (use_count() == 0), and line B results in a
shared_ptr to 0 (use_count() == 1).
I can work around this, I'm sure. Can anyone clarify my muddled thinking
and explain why boost is behaving correctly in this situation (if indeed
it is!)
Many thanks
Carl
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