[OT] general C++ question

[Christoph Höger]

Hi all,

I just learned about closures in the Boost library and wanted to write
some shorter code. To test, I used the following snippet:

#include <iostream>
#include <string>

#include <boost/function.hpp>
#include <boost/bind.hpp>

class FakeVisitor {
public:
  virtual void visit(int e) {}
  virtual void visit(std::string e) = 0;
};

template <typename T> class GenericVisitor : public FakeVisitor {
public:
  boost::function<void (T e)> f;
  virtual void visit(T e) { f(e); }
};

void print(int a, int i) {
  std::cout << a << ":" << i << std::endl;
}

int main(int argc, char** argv) {
  GenericVisitor<int> v;
  v.f = boost::bind(&print, 0, _1);

  v.visit((int) 1);
  v.visit(std::string("hallo"));
  //boost::bind(print, 1, _1)(2);
}

Apparently, it does not work. Does anyone know why GenericVisitor<int>
does not inherit visit(std::string)?