//----------------------------------------------------------------------------- // boost mpl/example/inherit_multiply.cpp source file // See http://www.boost.org for updates, documentation, and revision history. //----------------------------------------------------------------------------- // // Copyright (c) 2002 // Aleksey Gurtovoy // // Permission to use, copy, modify, distribute and sell this software // and its documentation for any purpose is hereby granted without fee, // provided that the above copyright notice appears in all copies and // that both the copyright notice and this permission notice appear in // supporting documentation. No representations are made about the // suitability of this software for any purpose. It is provided "as is" // without express or implied warranty. #include "boost/mpl/inherit.hpp" #include "boost/mpl/inherit_linearly.hpp" #include "boost/mpl/list.hpp" #include <iostream> namespace mpl = boost::mpl; using namespace mpl::placeholders; template< typename T > struct tuple_field { typedef tuple_field type; // note the typedef T field_; }; template< typename T > inline T& field(tuple_field<T>& t) { return t.field_; } typedef mpl::inherit_linearly< mpl::list<int,char const*,bool> , mpl::inherit< _1, tuple_field<_2> > >::type my_tuple; int main() { my_tuple t; field<int>(t) = -1; field<char const*>(t) = "text"; field<bool>(t) = false; std::cout << field<int>(t) << '\n' << field<char const*>(t) << '\n' << field<bool>(t) << '\n' ; return 0; }