Instantiating a variadic member function template of a class template

Question

How can I instantiate a variadic member function template of a class template in separate .cpp file? Say, given an above class template in a set of files: a.hpp with definition of interface, a_impl.hpp with implementation and a.cpp with instantiation, - which includes each previous in the chain sequentially, but only the first is visible to the user of the class (as opposed to the developer).

Especially interested in case of an empty parameter pack.

score 2 · Answer 1 · answered May 22 '13 at 14:22

2

template <class A>
struct AA
{
  template<class Z, class... Q>
  void aa(double, Q... q) {};
};

template void AA<int>::aa<char>(double);
template void AA<int>::aa<char, char*>(double, char*);
template void AA<int>::aa<char, char*, char**>(double, char*, char**);

Note that in your setup only the "developer" can instantiate (one needs to see the implementation in order to be able to instantiate).

answered May 22 '13 at 14:22

n. m. could be an AI

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But is it obligatory the presence of the `Z` template parameter? – Tomilov Anatoliy May 23 '13 at 03:06
No it's just an example, it shows that you can have a template parameters not mentioned in the function signature. – n. m. could be an AI May 23 '13 at 03:39
Automatic template parameters deduction will not work in this case, isn't it? – Tomilov Anatoliy May 23 '13 at 09:02

Instantiating a variadic member function template of a class template

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