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<title>Issue 1409: Specify whether monotonic_clock is a distinct type or a typedef</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#Resolved">Resolved</a> status.</em></p>
<h3 id="1409"><a href="lwg-defects.html#1409">1409</a>. Specify whether <code>monotonic_clock</code> is a distinct type or a typedef</h3>
<p><b>Section:</b> 99 [time.clock.monotonic] <b>Status:</b> <a href="lwg-active.html#Resolved">Resolved</a>
 <b>Submitter:</b> INCITS <b>Opened:</b> 2010-08-25 <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#time.clock.monotonic">issues</a> in [time.clock.monotonic].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#Resolved">Resolved</a> status.</p>
<p><b>Discussion:</b></p>
<p><b>Addresses US-111</b></p>
<p>
What it means for <code>monotonic_clock</code> to be a synonym is
undefined. If it may or may not be a typedef, then certain
classes of programs become unportable.
</p>

<p><i>[
Resolution proposed in ballot comment:
]</i></p>

<p>
Require that it be a distinct class type.
</p>

<p><i>[
2010-11-01 Daniel comments:
]</i></p>

<blockquote><p>
Paper <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3128.html">n3128</a> addresses
this issue by replacing <code>monotonic_clock</code> with <code>steady_clock</code>, which is not a typedef.
</p></blockquote>



<p id="res-1409"><b>Proposed resolution:</b></p>
<p>
This is resolved by <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3191.htm">n3191</a>.
</p>





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