[LLVMbugs] [Bug 16770] New: [RFE] add constexpr to some bitset functions

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16770

            Bug ID: 16770
           Summary: [RFE] add constexpr to some bitset functions
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: hhinnant at apple.com
          Reporter: 1zeeky at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 10972
  --> http://llvm.org/bugs/attachment.cgi?id=10972&action=edit
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).

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