AMDG On 03/06/2017 04:59 AM, Mikhail Strelnikov via Boost-users wrote:
I want to return type_erasure::any from a member function of a struct adapted by that same any. How can I do this?
For this to work you need to forward declare the Concept: struct my_concept; using my_any = boost::type_erasure::any<my_concept>; struct my_concept : boost::mpl::vector< copy_constructible<>, assignable<>, callable<my_any(my_any)>> {};
#include <boost/type_erasure/any.hpp> #include <boost/type_erasure/callable.hpp>
using my_any = boost::type_erasure::any< boost::mpl::vector< boost::type_erasure::copy_constructible<>, boost::type_erasure::assignable<>, boost::type_erasure::callable<? ? ?> >
;
struct s { my_any operator()(my_any v) { return v; } };
int main() { my_any t = s{}; t = t(t); }
In Christ, Steven Watanabe