Boost C++ Libraries: Ticket #4659: I have 4 new conversion chars I want

attachment set

Sun, 19 Sep 2010 08:38:04 GMT

attachment → patchfile.patch

made using "svn diff > patchfile.patch", yep it's a patch file

Sun, 19 Sep 2010 09:00:57 GMT

I have also implemented a version of printf, and fprintf using C++0x's Variadic templates well I did two versions the first is feature rich but lacks the %1$ etc syntax the second uses boost::format to do the heavy lifting, and hence has that syntax, both are type safe, I also did a type safe version of scanf and fscanf, using Variadic templates those things rock, I have tested this against my patched format library and it works good :D I could attach the files if thats ok

James E. King, III — Sat, 14 Oct 2017 13:47:13 GMT

Any changes for non-standard extensions would need to be qualified with preprocessor guards. Bringing Boost.Format up to ISO C11 printf syntax rules is probably the next step, and then anything else like boolean, repeating extensions would need to be identified as non-standard and explicitly enabled, and I would be concerned about the extensions colliding with future standards.

status changed; resolution set

James E. King, III — Wed, 18 Oct 2017 13:28:37 GMT

status new → closed
resolution → wontfix

I like the idea of adding more functionality. Specifically I think that %b might make sense and %B might make sense, and I can see where there could be a printf compatible syntax for repeating, however what was suggested does not "end" in a conversion specifier and therefore would not be acceptable as a format string. I'm going to carry the boolean notion over to github issues and close this out.

James E. King, III — Tue, 24 Oct 2017 18:33:09 GMT

Note that %r and %R are unnecessary as you can use http://en.cppreference.com/w/cpp/string/basic_string/basic_string(constructor number 2) to make a string containing a character of a specific length.

I will be submitting a PR for %b going to std::boolalpha today. %B does not work out, since std::ios_base::uppercase only applies to numeric conversion.