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/*=============================================================================
Copyright (c) 2012 Joel falcou
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#include <iostream>
#include <boost/mpl/transform.hpp>
#include <boost/fusion/include/mpl.hpp>
#include <boost/fusion/adapted/mpl.hpp>
#include <boost/fusion/include/at.hpp>
#include <boost/fusion/include/as_vector.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/fusion/include/adapt_struct.hpp>
struct foo
{
double d; float f; short c;
};
BOOST_FUSION_ADAPT_STRUCT(foo,(double,d)(float,f)(short,c))
template<class T>
class composite_reference
: public boost::mpl::
transform < typename boost::fusion::result_of::
as_vector<T>::type
, boost::add_reference<boost::mpl::_>
>::type
{
public:
typedef typename boost::mpl::
transform < typename boost::fusion::result_of::
as_vector<T>::type
, boost::add_reference<boost::mpl::_>
>::type parent;
composite_reference(T& src) : parent( src ) {}
composite_reference(parent& src) : parent(src) {}
composite_reference& operator=(T& src)
{
static_cast<parent&>(*this) = static_cast<parent&>(src);
return *this;
}
composite_reference& operator=(parent const& src)
{
static_cast<parent&>(*this) = src;
return *this;
}
};
int main(int,char**)
{
foo f;
composite_reference<foo> ref_f(f);
boost::fusion::at_c<0>(ref_f) = 1.2;
boost::fusion::at_c<1>(ref_f) = 1.2f;
boost::fusion::at_c<2>(ref_f) = 12;
std::cout << f.d << " " << f.f << " " << f.c << "\n";
}
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