c++overloadingc++20parameter-pack

Is it possible to define a method overload for each element of a template parameter pack?

Suppose I have a class template with a type template parameter pack, like

template<typename... types>
class Foo {};

Is there any way I could define methods in Foo, say void bar(T x); with overloads for each type T in the parameter pack types?

Solution

  • You can have Foo inherit each base with void bar(T x):

    template<typename T>
struct FooBase {
  void bar(T x);
};

template<typename... types>
struct Foo : FooBase<types>... {
  using FooBase<types>::bar...;
};