[boost] [Boost-bugs] [ boost-Bugs-1521741 ] Constness in iterator_facade::operator->

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-07-13 07:21:52

Bugs item #1521741, was opened at 2006-07-13 11:21
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Category: iterator
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Richard Smith (ras52)
Assigned to: David Abrahams (david_abrahams)
Summary: Constness in iterator_facade::operator->

Initial Comment:
The C++ standard states (table 72) that for an input
iterator, a->m is equivalent to (*a).m.  If operator*
returns a value_type by non-const value, it is possible
to call a non-const member function on the temporary
returned from the function.  However, the
operator_arrow_proxy class acts as a proxy to T const*
rather than T*, this that you can do

  (*i).non_const_method();

but not

  i->non_const_method();

for certain input iterators.

See discussion here:

http://lists.boost.org/Archives/boost/2006/07/107713.php
http://lists.boost.org/Archives/boost/2006/07/107740.php
http://lists.boost.org/Archives/boost/2006/07/107756.php

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