[Boost-users] How to make Boost.Format fault tolerant?

Subject: [Boost-users] How to make Boost.Format fault tolerant?
From: John M. Dlugosz (mpbecey7gu_at_[hidden])
Date: 2012-02-09 23:14:32

A common case for using Boost.Format is in the production of error or warning messages.  
So, these don't get run on a normal use of the program, and problems with the arguments 
will go unnoticed until there _is_ an error, in which case I get (at best) no error 
message, or worse, turn a log-only warning statement into an exception.

Does Format already have some features to make it not throw exceptions?  Idealy, for 
messages that go into a log or are used to diagnose some program bug, any information is 
better than none and I'd like to see what it did get as best as it can, and not worry 
about how pretty it may be.  So missing arguments use a default placeholder text instead, 
and extra arguments without specifiers in the format string just get appended with spaces 
in between, and any formatting spec error just goes back to default string, and any error 
during that gives a placeholder but the other arguments are processed.

—John