| c++ Programming Glossary: indexed_typeHow to make generic computations over heterogeneous argument packs of a variadic template function? http://stackoverflow.com/questions/14261183/how-to-make-generic-computations-over-heterogeneous-argument-packs-of-a-variadic  the same class twice template unsigned I typename T struct indexed_type  static const unsigned int index I using type T  The functor.. inherit the same base class twice. detail invoker detail indexed_type Is typename nth_type_of Is Ts... type ... invoker f nth_value_of.. 
 “Manual” signature overload resolution http://stackoverflow.com/questions/14972954/manual-signature-overload-resolution  up with an index template typename R std size_t i struct indexed_type typedef R type enum value i Sequences of size_t template std.. unpacked_func R Args... i typedef unpacked_func indexed_type R i Args... type template typename Func std size_t i using IndexRetval.. void 0 indexed indexed apply std function type test indexed_type void 0 return indexed_type void 0  template std size_t n typename.. 
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