[Boost-users] About indirect_iterator

From: Jens Theisen (jens.theisen_at_[hidden])
Date: 2005-01-09 14:45:30

Hello,

I want to use indirect_iterator and noticed that it subscript operator 
returns a proxy.

I found the following explanation in iterator_facade.h:

     // A proxy return type for operator[], needed to deal with
     // iterators that may invalidate referents upon destruction.
     // Consider the temporary iterator in *(a + n)

But I still don't understand why a proxy is necessary in some cases.

Thank you in advance,

Jens