:relfileprefix: ../../../ [#boost-urls-see_below-format_arg] == xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/see_below.adoc[pass:[see_below]]::format_arg === Synopsis Declared in header `` [source,cpp,subs="verbatim,macros,-callouts"] ---- using format_arg = detail::format_arg; ----