On Sat, Dec 20, 2008 at 5:29 AM, Daniel Oberhoff <daniel.oberhoff@fit.fraunhofer.de> wrote:
HasPropertiesBase<VariantTypes> * foo = new Foo; foo->set_property("a", 1); int a = get<int>( foo->get_property( "a" ) );
If this is your typical use case, I would implement properties non-intrusively in a separate property_database: property_database pd; boost::shared_ptr<Foo> foo(new Foo); pd.set<int>(foo,"a"); The property_database class is essentially a std::map<boost::weak_ptr<void>,std::map<std::string,boost::any>>, and you'd dynamic_cast<void *> the pointers passed to set and get. Another thought, you can also use tag types to make the properties compile-time type-safe. See the similar system used in http://www.boost.org/doc/libs/1_37_0/libs/exception/doc/boost-exception.html. In that case the syntax could be: typedef property<struct tag_a,int> prop_a; pd.set(prop_a(42),foo); int p=pd.get<prop_a>(foo); Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode