C++ Function, take in enum and return a typedef class type to be used in template? -

is possible write (inline?) c++ function, accept enum input , returns class type can used in template declaration?

my intuition since there finite number of enum types, should possible?

enum myenumtype { a, b, c };  class myclassa { }; class myclassb { }; class myclassb { };  template class<t> class atemplatedclass {   // ... };  notsurewhatreturntype convertenumtoclasstype(myenumtype type) {   switch (type) {      case a: return myclassa;      case b: return myclassb;      case c: return myclassc:      default: throw;   } }  myenumtype type = gottensomewhere();  auto class_type = convertenumtoclasstype(type);  atemplatedclass<class_type> is_this_possible; 

functions cannot return types. need metafunction:

template <myenumtype> struct convertenumtoclasstype;  template <> struct convertenumtoclasstype<a> {     typedef myclassa type; };  template <> struct convertenumtoclasstype<b> {     typedef myclassb type; };  // … etc.  typedef convertenumtoclasstype<a> class_type;  atemplatedclass<class_type> is_this_possible; 

of course works @ compile time (since that’s when templates resolved).