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<title>Issue 836: 
       Effects of money_base::space and
       money_base::none on money_get
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       Effects of money_base::space and
       money_base::none on money_get
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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#C++11">C++11</a> status.</em></p>
<h3 id="836"><a href="lwg-defects.html#836">836</a>. 
       Effects of <code>money_base::space</code> and
       <code>money_base::none</code> on <code>money_get</code>
   </h3>
<p><b>Section:</b> 28.3.4.7.2.3 <a href="https://wg21.link/locale.money.get.virtuals">[locale.money.get.virtuals]</a> <b>Status:</b> <a href="lwg-active.html#C++11">C++11</a>
 <b>Submitter:</b> Martin Sebor <b>Opened:</b> 2008-05-17 <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.money.get.virtuals">issues</a> in [locale.money.get.virtuals].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#C++11">C++11</a> status.</p>
<p><b>Duplicate of:</b> <a href="lwg-closed.html#670" title="money_base::pattern and space (Status: Dup)">670</a></p>
<p><b>Discussion:</b></p>

       <p>

In paragraph 2, 28.3.4.7.2.3 <a href="https://wg21.link/locale.money.get.virtuals">[locale.money.get.virtuals]</a> specifies the following:

       </p>
       <blockquote><p>

Where <code>space</code> or <code>none</code> appears in the format
pattern, except at the end, optional white space (as recognized
by <code>ct.is</code>) is consumed after any required space.

       </p></blockquote>
       <p>

This requirement can be (and has been) interpreted two mutually
exclusive ways by different readers. One possible interpretation
is that:

       </p>
       <blockquote>
           <ol>
               <li>

where <code>money_base::space</code> appears in the format, at least
one space is required, and

               </li>
               <li>

where <code>money_base::none</code> appears in the format, space is
allowed but not required.

               </li>
           </ol>
       </blockquote>
       <p>

The other is that:

       </p>
       <blockquote><p>

where either <code>money_base::space</code> or <code>money_base::none</code> appears in the format, white space is optional.

       </p></blockquote>

<p><i>[
San Francisco:
]</i></p>


<blockquote><p>
Martin will revise the proposed resolution.
</p></blockquote>

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


<blockquote>
<p>
There is a noun missing from the proposed resolution. It's not clear
that the last sentence would be helpful, even if the word were not
missing:
</p>
<blockquote><p>
In either case, any required MISSINGWORD followed by all optional whitespace 
(as recognized by <code>ct.is()</code>) is consumed.
</p></blockquote>
<p>
Strike this sentence and move to Review.
</p>

<p><i>[
Howard: done.
]</i></p>

</blockquote>

<p><i>[
2009-10 Santa Cruz:
]</i></p>


<blockquote><p>
Move to Ready.
</p></blockquote>

   

   <p id="res-836"><b>Proposed resolution:</b></p>
       <p>

I propose to change the text to make it clear that the first
interpretation is intended, that is, to make following change to
28.3.4.7.2.3 <a href="https://wg21.link/locale.money.get.virtuals">[locale.money.get.virtuals]</a>, p. 2:

       </p>

       <blockquote><p>

When <code><ins>money_base::</ins>space</code>
or <code><ins>money_base::</ins>none</code> appears <ins>as the last
element </ins>in the format pattern, <del>except at the end, optional
white space (as recognized by <code>ct.is</code>) is consumed after
any required space.</del> <ins>no white space is consumed. Otherwise,
where <code>money_base::space</code> appears in any of the initial
elements of the format pattern, at least one white space character is
required. Where <code>money_base::none</code> appears in any of the
initial elements of the format pattern, white space is allowed but not
required.</ins>
If <code>(str.flags() &amp; str.showbase)</code> is <code>false</code>, ...

       </p></blockquote>
   



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