Struct template placeholder

Struct template placeholder_of

boost::type_erasure::placeholder_of

Synopsis

// In header: <boost/type_erasure/placeholder_of.hpp>

template<typename T> 
struct placeholder_of {
  // types
  typedef unspecified type;
};

Description

A metafunction returning the (const/reference qualified) placeholder corresponding to an any. It will also work for all bases of any, so it can be applied to the Base parameter of concept_interface.