Method scan_parse_context

test/scan.h:214–215

  using iterator = string_view::iterator;

  FMT_CONSTEXPR explicit scan_parse_context(string_view format)
      : format_(format) {}

  FMT_CONSTEXPR auto begin() const -> iterator { return format_.begin(); }
  FMT_CONSTEXPR auto end() const -> iterator { return format_.end(); }