boost::openmethod::IsVirtualAny

Declared in <boost/openmethod/interop/virtual_any.hpp>

Evaluates to true if T is a specialization of virtual_any, and false otherwise.

This constrains the constructor and the assignment operator of virtual_any that take a value, excluding every specialization of the wide type, not only the one matching this virtual_any. A matching argument then selects the copy or move operation instead of being stored inside the any; any other specialization is rejected outright rather than stored: a virtual_any is not a registered class, so its registry::static_vptr would be null.

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