id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7700	remove_if with Placeholder Expression as predicate causes instantiation of PlaceHolder Expression before argument binding in GCC 4.7.2	felipe.m.almeida@…	Kohei Takahashi	"
The following code instantiates meta_func<mpl::arg<1> >, which causes a compile error.

The problem seems to be with the mpl::not_ which involves the predicate with remove_if. The same error doesn't happen with filter_if. The equivalent code in MPL-only doesn't cause the same error (mpl::remove_if).

#include <boost/fusion/include/as_vector.hpp>
#include <boost/fusion/include/remove_if.hpp>

namespace mpl = boost::mpl;
namespace fusion = boost::fusion;

struct element
{
   typedef mpl::false_ type;
};

template <typename T>
struct meta_func
{
   typedef typename T::type type;
};

int main()
{
   fusion::vector<element, element> e;
   fusion::as_vector(fusion::remove_if<meta_func<mpl::_1> >(e));
}
"	Bugs	new	To Be Determined	fusion	Boost 1.52.0	Regression