Add variadic_helpers.hpp
get_type<i, Types...>, gets a type by indexget_value<i>(values...), gets an argument by indexfor_each_type<Types...>(lambda), visits all typesfor_each_value(lambda, Types&& values...), visits all values
for_each_type and for_each_value will invoke a callable with the current index and current type/value.
Add variadic_helpers.hpp
get_type<i, Types...>, gets a type by indexget_value<i>(values...), gets an argument by indexfor_each_type<Types...>(lambda), visits all typesfor_each_value(lambda, Types&& values...), visits all valuesfor_each_typeandfor_each_valuewill invoke a callable with the current index and current type/value.