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Fixed is-writable computation. Traits protocol still needs fixing.

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[SVN r20398]
This commit is contained in:
Dave Abrahams
2003-10-16 13:57:35 +00:00
parent 1c39976ccd
commit 17026cc30d
1 changed files with 10 additions and 4 deletions
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14
doc/new-iter-concepts.rst
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@ -6,9 +6,10 @@
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@acm.org
:organization: `Boost Consulting`_, Indiana University `Open Systems Lab`_, University of Hanover `Institute for Transport Railway Operation and Construction`_
:date: $Date$
:Number: N1531=03-0114
:Number: revised from `N1531=03-0114`__
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. All rights reserved
.. __: n1531_
.. _`Boost Consulting`: http://www.boost-consulting.com
.. _`Open Systems Lab`: http://www.osl.iu.edu
.. _`Institute for Transport Railway Operation and Construction`: http://www.ive.uni-hannover.de
@ -18,12 +19,13 @@
concepts to more closely match the requirements
of algorithms and provides better categorizations
of iterators that are used in practice. This proposal
is a revision of paper n1297_ and n1477_.
is a revision of paper n1297_, n1477_, and n1531_.
.. contents:: Table of Contents
.. _n1297: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2001/n1297.html
.. _n1477: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1477.html
.. _n1531: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1531.html
============
Motivation
@ -739,8 +741,12 @@ deduced. The following pseudo-code describes the algorithm.
cat = iterator_traits<Iterator>::iterator_category;
if (cat == iterator_tag<Access,Traversal>)
return Access & writable_iterator;
else if (cat is convertible to forward_iterator_tag
or output_iterator_tag)
else if (cat is convertible to output_iterator_tag)
return true;
else if (
cat is convertible to forward_iterator_tag
and iterator_traits<Iterator>::reference is a
mutable reference)
return true;
else
return false;