12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364 |
- /*=============================================================================
- 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";
- }
|