Is there a 'catch' with FastFormat?

Question

I just read about the FastFormat C++ i/o formatting library, and it seems too good to be true: Faster even than printf, typesafe, and with what I consider a pleasing interface:<

Answer 1

Although FastFormat is a good library there are a number of issues with it:

• Limited formatting support, in particular the following features are not supported:
  • Leading zeros (or any other non-space padding)
  • Octal/hexadecimal encoding
  • Runtime width/alignment specification
• The library is quite big for a relatively small task of formatting and has even bigger dependency (STLSoft).