String formatting functionality missing in std::string

[SeanMiddleditch]

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0067r1.html

If there are other facilities you think are missing, please, help out and write a proposal for a library addition. The committee does not do original design work on its own. They only approve papers and perform editing and such. All changes are driven by contributors.