-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Wednesday 09 April 2008 14:13 pm, Daniel Frey wrote:
On Wed, 2008-04-09 at 13:40 -0400, Frank Mori Hess wrote:
But *this inside enable_shared_from_this<T> is not a T*, it is a enable_shared_from_this<T>*. To downcast it to a T* requires a dynamic_cast for the general case, which requires a vtable. Not that I consider a vtable to be significant overhead (I know, it's a horrifiying opinion for a C++ programmer but there it is).
static_cast<T*>(this) should be legal AFAIK (and doesn't need a vtable)
It works in some cases, but it will fail the smart_ptr/test/shared_from_this_test.cpp test for example. - -- Frank -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFH/Qh15vihyNWuA4URAoanAKDl0x7Gg7kLDonOZtds/xeIG/eBngCgtP7Z +fVQ6X5wP/WT7JRyAnSJtf8= =m0wT -----END PGP SIGNATURE-----