What happened to dynamic_any btw? http://www.ddj.com/cpp/184403961 Mathias Gaunard schrieb:
A few little ideas that could eventually be joined to be a single GSoC project:
- Allow visitation for Any. This can actually be generalized to any object that exposes a type_info, such as polymorphic objects.
Techniques, including non-portable ones based on name mangling, could be experimented to get more efficient dispatch.
- Add SBO to any.
- Improve variant so that the functor doesn't require to expose a result_type. The result_type can be automatically deduced by "joining" all the possible return types obtained by boost::result_of.
- Allow the easy construction of a visitor from lambda expressions, with a syntax like
variant<int, std::string> a = "foo";
int b = match(a).with( args<int>(_1), args<std::string>(size(_1)) );
instead of the potentially more verbose
struct my_visitor : static_visitor<int> { int operator()(int a) { return a; } int operator()(const std::string& b) { return b.size(); } };
variant<int, std::string> a = "foo";;
int b = apply_visitor(my_visitor(), a);
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