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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/99942] New: [8/9/10/11 Regression] COW
 std::string::data() is noexcept but can throw
Date: Tue, 06 Apr 2021 16:24:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99942

            Bug ID: 99942
           Summary: [8/9/10/11 Regression] COW std::string::data() is
                    noexcept but can throw
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

The C++17 non-const data() was fixed for PR 86169 so that it un-shares the
string if needed. However, this means it can reallocate, and so should not =
be
marked noexcept.

The right fix is probably just to remove 'noexcept', but we might also want=
 to
consider not providing that member function at all for the COW string.=