Function printf

extlibs/fmt/include/fmt/printf.h:175–178

template <typename Char, typename Context>
void printf(buffer<Char>& buf, basic_string_view<Char> format,
            basic_format_args<Context> args) {
  Context(std::back_inserter(buf), format, args).format();
}

template <typename OutputIt, typename Char, typename Context>
internal::truncating_iterator<OutputIt> printf(