[llvm-bugs] [Bug 49798] New: basic_string::assign doesn't handle iterators into the string itself

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49798

            Bug ID: 49798
           Summary: basic_string::assign doesn't handle iterators into the
                    string itself
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rs2740 at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

basic_string::assign, unlike the containers', needs to tolerate the case where
the iterators refers into the string. See https://wg21.link/string.assign#15,
which depicts a temporary string being constructed before any mutation takes
place.

Test case:

    std::string s = "abcde";
    s.assign(s.rbegin(), s.rend());
    assert(s == "edcba");

I suspect, but have not checked, that other member functions taking iterator
pairs may have similar issues.

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