How to truncate width of integral types with std::ostringstream?

The stream formatting capabilities are not intended as a general purpose string manipulation package. What you are trying to do does not make much sense numerically, so it is not supported - using the substring or similar functions is the way to go. You can (and should, if you need this in more than one place) write your own function to do the job.

Truncating to remove significant digits is "frowned upon" by most modern programmers. In the bad old days of FORTRAN formatting, it was pretty common to get output like.

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