Function handle_dynamic_spec

extlibs/fmt/include/fmt/format.h:2710–2724

template <template <typename> class Handler, typename Context>
void handle_dynamic_spec(int& value, arg_ref<typename Context::char_type> ref,
                         Context& ctx) {
  switch (ref.kind) {
  case arg_id_kind::none:
    break;
  case arg_id_kind::index:
    value = internal::get_dynamic_spec<Handler>(ctx.arg(ref.val.index),
                                                ctx.error_handler());
    break;
  case arg_id_kind::name:
    value = internal::get_dynamic_spec<Handler>(ctx.arg(ref.val.name),
                                                ctx.error_handler());
    break;
  }
}

using format_func = void (*)(internal::buffer<char>&, int, string_view);