I have been on a C++ coding bender during the Holidays. While putting together a couple of demo programs for the YARD parser I found I desparately wanted a library which allowed using C++ programs within programs like unix filters, where their standard-in and standard-out can be redirected. While developing this unix-filter library it lead me to desire a variant style type, but I don't like boost::any or boost::variant ( too many dependencies ), so I rolled my own.

So all of this to say, I just posted my latest creation, a union-list type, at CodeProject.com.

Here is a demonstration of how the type is used:

  #include "..\utils\union_list.hpp"

  #include <iostream>

  using namespace std;

  typedef ul<int, ul<char const*, ul_end> > IntOrString_T;

  int main() {
    IntOrString_T i(42);
    IntOrString_T s("hello");
    cout << i.TypeIndex() << endl; // outputs 0
    cout << s.TypeIndex() << endl; // outputs 1
    cout << i.Get<0>() << endl; // outputs 42
    cout << s.Get<1>() << endl; // outputs hello
    return 0;
  }