Define multiple methods with parameters from variadic templates

Question

I want to define a base template class in a way so that it takes variadic template arguments and defines a virtual method for each argument, where the parameter is the argum

Answer 1

Here is a suggestion that requires exact type matching:

#include 
#include 
#include 
#include 
#include 
#include 

#include 

using namespace std;

// GCC demangling -- not required for functionality
string demangle(const char* mangled) {
  int status;
  unique_ptr result(
    abi::__cxa_demangle(mangled, 0, 0, &status), free);
  return result.get() ? string(result.get()) : "ERROR";
}

template
struct BaseSingle {
  virtual void BaseFoo(Param) {
    cout << "Hello from BaseSingle<"
         << demangle(typeid(Param).name())
         << ">::BaseFoo" << endl;
  };
};

template
struct Base : public BaseSingle... {
  template void Foo(T&& x) {
    this->BaseSingle::BaseFoo(forward(x));
  }
};

int main() {
  Base b;
  b.Foo(1);
  b.Foo(true);
  b.Foo(string("ab"));
}

But IMO your own suggestion using recursive inheritance sounds more elegant.