id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
10129	boost::arg and boost::is_placeholder not documented	Joaquín M López Muñoz	Peter Dimov	"Boost.Bind default placeholders (anonymous namespace)`::_1`, (anonymous namespace)`::_2` etc. can be not used either by directly creating objects of type `boost::arg<1>`, `boost::arg<2>` etc. or by resorting to user-defined placeholders properly labelled as such via `boost::_is_placeholder`. This comes handy when `BOOST_BIND_NO_PLACEHOLDERS` is set and in general when the `_1` syntax is not welcome for whatever reason.

The problem is that both `boost::arg<N>` and `boost::is_placeholder` are not documented, i.e. they officially do not exist. This, in particular, renders Boost.Bind effectively unusable when `BOOST_BIND_NO_PLACEHOLDERS` is in effect.

This is a request that these constructs be documented. More info on the subject on

http://lists.boost.org/Archives/boost/2014/03/212333.php"	Bugs	new	To Be Determined	bind	Boost 1.56.0	Problem