Extract template from type

example.cpp

struct SampleData {
  Container<float> totalradiance;
  Container<int> lightcutSize;

  template <class T>
  struct decl_sampledata_from_container {};

  template <template <class, class...> class C, class T>
  struct decl_sampledata_from_container<C<T>> {
    typedef SampleData<C> type;
  };

  template <class Fun>
  auto make(Fun make)
    -> typename decl_sampledata_from_container<decltype(make(totalradiance))>::type
  {
    return {
       make(totalradiance   )
     , make(lightcutSize    )
    };
	}
};

struct converter
{
	template <class T>
	::std::list<T> operator()(::std::vector<T>& v)
	{
		return ::std::list<T>(v.begin(), v.end());
	}
};

int main() {
	SampleData<::std::vector> samples;

	SampleData<::std::list> const converted = samples.make(converter());

	return 0;
}