Re: Dependency Loop seems unavoidable

"Victor Bazarov" <>
Thu, 23 Aug 2007 14:54:12 -0400
BobR wrote:

Victor Bazarov <> wrote in message...

BobR wrote:

Victor Bazarov <> wrote in message...

BobR wrote:


  Set<people*> m_clients; file://all clients

... if the 'Set' was std::set, we both know there's a missing
'comparator' in the instantiation.

Why do you say that it's missing? There is the default compare
functor, std::less...

Ah, I wasn't aware that (default) std::less was smart enough to
dereference the pointer.
I'll have to read-up on that.

It does not dereference it (why would it?), it just compares
the values. The idea for the 'set' is that the uniqueness is
ensured by the strict weak ordering.

Person joe("Joe Smith");
Person smith("Joe Smith");
std::set<Person*> clients;
clients.insert( &joe );
clients.insert( &smith );
assert( 1 == clients.size() );


The assertion will fail. 'joe' and 'smith' are different objects.
Their addresses are different, therefore the set will store both
of them, independently.

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