The format_to functions claim OutputIterator support but actually expect a back_insert_iterator

[mikezackles]

Thanks for a useful library!

As best I can tell, both container_type and operator= are specific to back_insert_iterator, and not a part of OutputIterator. So these functions don't actually support output iterators.

It seems like either the code needs to be modified to use just the OutputIterator operations or the documentation should be updated.

[mikezackles]

(Note that I ran into this using format_to_n. Perhaps it is just specific to internal::truncating_iterator?)

[vitaut]

format_to_n supports iterators other than back_insert_iterator, e.g.

#include <fmt/format.h>

int main() {
  char buf[10];
  fmt::format_to_n(buf, 10, "{}", 42);
}

https://godbolt.org/z/Pg_aQ_

[mikezackles]

My mistake, I should've given an example: https://godbolt.org/z/_edHPs

[vitaut]

Thanks for the example. Should be fixed in 9e3f3e8.

[mikezackles]

Awesome, thank you!