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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Compilation error when casting an explicit template argument which is a member-function"
href="https://bugs.llvm.org/show_bug.cgi?id=35971">bug 35971</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>INVALID
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<td style="text-align:right;">CC</td>
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<td>richard-llvm@metafoo.co.uk
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Compilation error when casting an explicit template argument which is a member-function"
href="https://bugs.llvm.org/show_bug.cgi?id=35971#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Compilation error when casting an explicit template argument which is a member-function"
href="https://bugs.llvm.org/show_bug.cgi?id=35971">bug 35971</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>(In reply to Borislav Stanimirov from <a href="show_bug.cgi?id=35971#c0">comment #0</a>)
<span class="quote">> Both examples compile fine on gcc and msvc</span >
That is a bug in those compilers. The C++11 and C++14 rules are quite clear
about the permitted syntactic forms of non-type template arguments.
[temp.arg.nontype]/1.3 says the argument shall be:
"[...] a pointer to member expressed as described in [expr.unary.op]"
GCC does correctly implement the rule for the non-pointer-to-member case:
<a href="https://godbolt.org/g/jb6gwU">https://godbolt.org/g/jb6gwU</a>
... strongly suggesting that this is just an oversight on their part. (MSVC has
apparently never followed the rules here.)
The rule in question was changed in C++17 to allow arbitrary constant
expressions of the right type as non-type template arguments:
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4198.html">http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4198.html</a></pre>
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