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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [C++11] An assignment of a lambda expression to a pointer to function ignores exception specification."
href="http://llvm.org/bugs/show_bug.cgi?id=21011">21011</a>
</td>
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<th>Summary</th>
<td>[C++11] An assignment of a lambda expression to a pointer to function ignores exception specification.
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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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>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kariya_mitsuru@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>A sample code below should cause a compilation error but it is compiled
successfully by clang.
=================================
int main()
{
void(*fp)() noexcept = []{};
fp();
}
=================================
cf. <a href="http://melpon.org/wandbox/permlink/kS5AxGICzzglWBTW">http://melpon.org/wandbox/permlink/kS5AxGICzzglWBTW</a>
According to C++11 standard [expr.prim.lambda] 5.1.2/5, "[]{}" has a conversion
function to pointer to function "void(*)()".
C++11 standard [except.spec] 15.4/5 also says that "the target entity shall
allow at least the exceptions allowed by the source value in the assignment or
initialization."
So, I think that the sample code above is ill-formed.
I don't know whether a sample code below should be compiled successfully or not
because any struct cannot have a conversion function to pointer to function
"void(*)() noexcept".
=================================
int main()
{
void(*fp)() noexcept = []() noexcept {};
fp();
}
=================================</pre>
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