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Seems like this should be simple, but I don’t find it in a net search.
I have an ofstream which is open(), and fail() is now true. I’d like to know the reason for the failure to open, like with errno I would do sys_errlist[errno].
Unfortunately, there is no standard way of finding out exactly why open() failed. Note that sys_errlist is not standard C++ (or Standard C, I believe).