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<title>Issue 213: Math function overloads ambiguous</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="213"><a href="lwg-closed.html#213">213</a>. Math function overloads ambiguous</h3>
<p><b>Section:</b> 29.7 <a href="https://wg21.link/c.math">[c.math]</a> <b>Status:</b> <a href="lwg-active.html#NAD">NAD</a>
 <b>Submitter:</b> Nico Josuttis <b>Opened:</b> 2000-02-26 <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#c.math">issues</a> in [c.math].</p>
<p><b>View all issues with</b> <a href="lwg-status.html#NAD">NAD</a> status.</p>
<p><b>Discussion:</b></p>
<p>Due to the additional overloaded versions of numeric functions for
float and long double according to Section 26.5, calls such as int x;
std::pow (x, 4) are ambiguous now in a standard conforming
implementation. Current implementations solve this problem very
different (overload for all types, don't overload for float and long
double, use preprocessor, follow the standard and get
ambiguities).</p> <p>This behavior should be standardized or at least
identified as implementation defined.</p>


<p><b>Rationale:</b></p>
<p>These math issues are an
understood and accepted consequence of the design. They have
been discussed several times in the past. Users must write casts
or write floating point expressions as arguments.</p>




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