id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12397	static_assert in arg.hpp failing when using boost::placeholder with std::bind	anonymous	Peter Dimov	"In our project we currently use 
std::bind with boost::placeholers because boost::placeholders are already global namespace and some some of the dependency (header) libraries might depend on this so we can't use BOOST_BIND_NO_PLACEHOLDERS currently.


So we make boost::placeholers work with std::bin with this code:
{{{
namespace std {
	template<int N>
	struct is_placeholder<boost::arg<N>> : public integral_constant<int, N> {};
}
}}}
This worked fine, but since boost 1.60 when BOOST_CONSTEXPR was added to the boost::arg contructor the compliation fails for some of our developers with 

{{{
error: static assertion failed: I == is_placeholder<T>::value
         BOOST_STATIC_ASSERT( I == is_placeholder<T>::value );
}}}

from arg.hpp"	Bugs	new	To Be Determined	bind	Boost 1.61.0	Regression