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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - constexpr function pointers aren't considered valid template arguments (violates [temp.arg.nontype])"
href="http://llvm.org/bugs/show_bug.cgi?id=18043">18043</a>
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<th>Summary</th>
<td>constexpr function pointers aren't considered valid template arguments (violates [temp.arg.nontype])
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>oneill+llvmbugs@cs.hmc.edu
</td>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11598" name="attach_11598" title="Could that should compile, and doesn't.">attachment 11598</a> <a href="attachment.cgi?id=11598&action=edit" title="Could that should compile, and doesn't.">[details]</a></span>
Could that should compile, and doesn't.
clang++ (3.3 through r195314) considers the attached code buggy, producing the
error
buglet.cpp:16:5: error: no matching function for call to 'bar'
bar<fooAddr>();
^~~~~~~~~~~~
buglet.cpp:6:6: note: candidate template ignored: invalid explicitly-specified
argument for template parameter 'f'
void bar()
^
gcc 4.6 through 4.8 consider it valid, and my reading of the C++11 standard,
14.3.2 Template non-type arguments [temp.arg.nontype], indicates that the code
should be allowed, as it says:
"a constant expression (5.19) that designates the address of an object with
static storage duration and external or internal linkage or a function with
external or internal linkage, including function templates and function
template-ids but excluding non-static class members, expressed (ignoring
parentheses) as & id-expression, except that the & may be omitted if the name
refers to a function or array and shall be omitted if the corresponding
template-parameter is a reference;"</pre>
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