id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
3337	mpl::has_push_back_arg/mpl:::has_push_front_arg are incomplete types	Christopher Schmidt	Aleksey Gurtovoy	"boost::mpl::has_push_back_arg ([https://svn.boost.org/trac/boost/browser/trunk/boost/mpl/aux_/push_back_impl.hpp?rev=54948#L28]) and boost::mpl::push_front_arg ([https://svn.boost.org/trac/boost/browser/trunk/boost/mpl/aux_/push_front_impl.hpp?rev=54948#L28]) are both declared but not defined.
This leads to a compiler error when using mpl::has_push_back ([https://svn.boost.org/trac/boost/browser/trunk/boost/mpl/push_back.hpp?rev=54948#L40]) / mpl::has_push_front ([https://svn.boost.org/trac/boost/browser/trunk/boost/mpl/push_front.hpp?rev=54948#L40]) on a mpl sequence (to be precise a fusion sequence) which needs complete 'argument' types when being instanced.

Minimal testcase:[[BR]]
#include <boost/mpl/transform.hpp>[[BR]]
#include <boost/mpl/placeholders.hpp>[[BR]]
#include <boost/fusion/container/vector.hpp>[[BR]]
#include <boost/fusion/mpl.hpp>[[BR]]
boost::mpl::transform<boost::fusion::vector<>,boost::mpl::_1>::type t;"	Bugs	closed	Boost 1.40.0	mpl	Boost Development Trunk	Problem	fixed		Christopher Schmidt