Please add compile-time argument count checking

[ksergey]

Will be good if fmtlib will check number of arguments matched to number of arguments placeholders in format string.

[ksergey]

Something like there:
https://github.com/carlcook/variadicLogging/blob/master/main.cc

[vitaut]

Thanks for the suggestion, but note that the number of placeholders doesn't have to be the same as the number of arguments because there can be multiple placeholders referring to the same arguments:

fmt::format("{0}{0}", 42);

That said I plan to add a constexpr function for checking the format string. Will track it as a separate issue because it's part of the LEWG feedback.

[vitaut]

Adding constexpr checks is covered by #546.

[vitaut]

Compile-time format string checks are now available: http://zverovich.net/2017/11/05/compile-time-format-strings.html (note that it is still allowed not to use some arguments).