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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [RFE] add constexpr to some bitset functions"
href="http://llvm.org/bugs/show_bug.cgi?id=16770">16770</a>
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<th>Summary</th>
<td>[RFE] add constexpr to some bitset functions
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<th>Product</th>
<td>libc++
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>hhinnant@apple.com
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<th>Reporter</th>
<td>1zeeky@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10972" name="attach_10972" title="diff against my bitset header with constexpr additions">attachment 10972</a> <a href="attachment.cgi?id=10972&action=edit" title="diff against my bitset header with constexpr additions">[details]</a></span>
diff against my bitset header with constexpr additions
I would like constexpr versions of the following functions in std::bitset:
to_ulong, to_ullong
I wrote a patch.
Because it looked easy, I also converted all(), any(), none() and test() to
constexpr.
There are overloads for all(), any() and to_ullong to write the loops via
recursive function-calls. An additional overload for any() is used in the
exception-version of to_ul(l)ong.
I'm certain a couple of more could be converted to constexpr, like flip() and
the operators == and != (the latter two might even be useful as constexpr), but
I am currently not interested in those.
I am unable to execute the tests: I'm getting a Python exception about not
being able to find the __main__ module. As such, I only did a very rudimentary
test of the patch.
Further more, I might have violated (probably did) coding conventions and I
probably broke ABI compatibility (I have no experience with that).</pre>
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