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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - incorrect implementation of isnan and similar functions"
href="http://llvm.org/bugs/show_bug.cgi?id=18218">18218</a>
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<th>Summary</th>
<td>incorrect implementation of isnan and similar functions
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>hhinnant@apple.com
</td>
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<th>Reporter</th>
<td>gratal@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The standard specifies in [c.math] that isnan and other classification
functions must have the following overloads:
bool isnan(float x);
bool isnan(double x);
bool isnan(long double x);
Implementing it as a template seems like a good idea, except that the following
valid code is rejected:
#include <cmath>
struct A {
operator float() { return 0.0; }
};
int main() {
std::isnan(A());
}
The template should be enabled for every type that is convertible to an
arithmetic type, to make the implementation indistinguishable from what is
specified in the standard.</pre>
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</p>
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