Jonathan Wakely wrote:
On Wed, Jan 12, 2005 at 09:11:43AM -0700, Dave wrote:
A direct call to shared_from_this() does not work in a constructor. Is there any way that I may obtain a shared_ptr to myself while under construction?
I don't think so - since shared_from_this() requires the object to already be owned by another shared_ptr, which can't be possible if the object hasn't been constructed yet.
When you create a shared_ptr from a raw pointer, shared_ptr's constructor checks whether the pointee is of a type derived from enable_shared_from_this and if so it initialises a weak_count in the enable_shared_from_this base class.
Since you have not constructed your object yet you cannot have passed its address to a shared_ptr yet, so the weak_count can't have been initialised, so shared_from _this() will throw a bad_weak_ptr.
Can't you just go back to the old practice of deriving your class from shared_count? -- Dave Abrahams Boost Consulting http://www.boost-consulting.com