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<title>Issue 502: Proposition: Clarification of the interaction between a facet and an iterator</title>
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<p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#NAD">NAD</a> status.</em></p>
<h3 id="502"><a href="lwg-closed.html#502">502</a>. Proposition: Clarification of the interaction between a facet and an iterator</h3>
<p><b>Section:</b> 28.3.3.1.2.1 <a href="https://wg21.link/locale.category">[locale.category]</a> <b>Status:</b> <a href="lwg-active.html#NAD">NAD</a>
 <b>Submitter:</b> Christopher Conrade Zseleghovski <b>Opened:</b> 2005-06-07 <b>Last modified:</b> 2016-01-28</p>
<p><b>Priority: </b>Not Prioritized
</p>
<p><b>View all other</b> <a href="lwg-index.html#locale.category">issues</a> in [locale.category].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#NAD">NAD</a> status.</p>
<p><b>Discussion:</b></p>
<p>
Motivation:
</p>

<p>
This requirement seems obvious to me, it is the essence of code modularity. 
I have complained to Mr. Plauger that the Dinkumware library does not 
observe this principle but he objected that this behaviour is not covered in 
the standard.
</p>

<p><i>[
2009-07 Frankfurt
]</i></p>


<blockquote>
<p>
No objection to NAD, Fixed.
</p>
<p>
Move to NAD.
</p>
</blockquote>



<p id="res-502"><b>Proposed resolution:</b></p>
<p>
Append the following point to 22.1.1.1.1:
</p>

<p>
6. The implementation of a facet of Table 52 parametrized with an 
InputIterator/OutputIterator should use that iterator only as character 
source/sink respectively.
For a *_get facet, it means that the value received depends only on the 
sequence of input characters and not on how they are accessed.
For a *_put facet, it means that the sequence of characters output depends 
only on the value to be formatted and not of how the characters are stored.
</p>

<p><i>[
Berlin:  Moved to Open, Need to clean up this area to make it clear
locales don't have to contain open ended sets of facets. Jack, Howard,
Bill.
]</i></p>







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