[llvm-bugs] [Bug 47849] New: num_get::do_get(in, end, unsigned) broken for negative numbers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47849

            Bug ID: 47849
           Summary: num_get::do_get(in, end, unsigned) broken for negative
                    numbers
           Product: libc++
           Version: 11.0
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ramey at rrsd.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

#include <iostream>
#include <sstream>

int main() 
try {
  unsigned u;
  std::istringstream is{"-1"};
  is >> u;
  std::cout << u << std::endl;
}
catch (std::exception const& e)
{
  std::cerr << "ERR: " << e.what() << std::endl;
}

reading a character stream containing "-1" into an unsigned integer does not
set the fail bit nor does it throw an exception.  After the read completes, the
unsigned integer has a huge number in it.

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