"David Abrahams" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > [...] > BTW, this is also not the "strong guarantee" (I dunno, maybe people > mean something else by "strongly exception safe" -- is there a > definition somewhere?)
Does it even make sense to say that a c'tor provides the strong guarantee? It seems that the strong guarantee is more appropriate for describing operations on fully constructed objects. > [...] > The problem is that it's not very usable when the resource is passed > via some unmanaged mechanism like a raw pointer, because then > you need to protect it with something like an auto_ptr, and in the > case of a "do everything smart pointer" that's really somewhat silly > isnt it? So if I understand you correctly, you're saying SmartPtr *should* take ownership regardless of whether a policy c'tor throws, and thus, when a policy c'tor throws, the SmartPtr should do the right thing and free the resource? > [...] > You don't need that; you can just use a smart pointer member > <0.5 wink> Sorry, I don't follow. Do you mean that SmartPtr<> should really be a wrapper for the implementation, and it is the implementation that actually calls the policy c'tors? Even then, I don't see how you can get away from having to catch an exception from an initializer list. > > [...] > > Given how often people write auto_ptr<> without writing > > auto_ptr<>, I'd say yes. ;> > > Not a challenge, but can you give an example? I've never seen it > and I have trouble imagining why someone would do it. Well, what I meant was that people don't necessarily write a smart pointer with the full auto_ptr semantics. More often, it turns out to be something like scoped_ptr. But the people I know who do that tend to not know about the Boost pointers in the first place, and think they are inventing something cool because they understood enough about auto_ptr<> to make their own version with feature X (though usually not with the full move semantics). Dave _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
