Re: [Boost-users] [type_erasure] member function return any

6 Mar 2017

      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;
struct my_concept : boost::mpl::vector<
  copy_constructible<>,
  assignable<>,
  callable> {};
...
#include 
#include 
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