I have the following:
template<typename FIRST, typename SECOND>
Sender *createSenderChain() {
return new FIRST(new SECOND());
}
Is it possible to make the template variadic:
template<typename FIRST, typename ...Args>
Sender *createSenderChain() {
return new FIRST(new SECOND(new THIRD(new ...)) <-- This is the pattern I want,
but how should it be done
using the args list?
}
You can use recursion for this!
Guessing at your definition of Sender
:
struct Sender { ~Sender() {} };
struct A : Sender { A(Sender* = nullptr) {} };
struct B : Sender { B(Sender* = nullptr) {} };
struct C : Sender { C(Sender* = nullptr) {} };
// Base case
template <typename T>
Sender* createSenderChain()
{
return new T();
}
// Recursive case
template <typename T1, typename T2, typename ...Ts>
Sender* createSenderChain()
{
return new T1(createSenderChain<T2, Ts...>());
}
int main()
{
auto ptr = createSenderChain<A, B, C>();
}