#pragma once

namespace Interface
{
	#include <boost\variant.hpp>
	#include "EventHandler.h"
	#include "EventFunction.h"
	#include "Factory.h"
	#include "Functionality.h"
    #include "SystemTypes.h"


etc.

I want to use variant inside one of the headers included in the Interface namespace


In one of the pulled in boost headers:


#ifndef BOOST_TT_IS_INTEGRAL_HPP_INCLUDED
#define BOOST_TT_IS_INTEGRAL_HPP_INCLUDED

#include <boost/config.hpp>

// should be the last #include
#include <boost/type_traits/detail/bool_trait_def.hpp>

namespace boost {

//* is a type T an [cv-qualified-] integral type described in the standard (3.9.1p3)
// as an extention we include long long, as this is likely to be added to the
// standard at a later date
#if defined( __CODEGEARC__ )
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_integral,T,__is_integral(T))
#else
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_integral,T,false)

BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1(is_integral,unsigned char,true)
BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1(is_integral,unsigned short,true)
BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1(is_integral,unsigned int,true)
BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1(is_integral,unsigned long,true)


If I hover on the defines here it shows int Interface::boost etc. and I get a bunch of compiler errors (namespace doesn't exist)