The py2cpp library was created in order to make easier the call of a python 
function within c++ sources. It provides conversion functions to and from a
python object for some basic c++ types (int, double, std:: string and 
collections for these types: std::vector, std::list, std::map). It is possible 
to add your own conversion functions for your own types.

Example of use
---------------

Consider you have the following python file "mymodule.py":

________________________________________________________________________________
def myfunction(a, b):
  return "The result is", a/b
________________________________________________________________________________
  
You can call this function from c++ this way:

________________________________________________________________________________
  #include "TypeConversions.hxx"
  #include "Result.hxx"
  #include "PyFunction.hxx"
  ...
  Py_Initialize();
  ...
  std::string s;
  double d;
  py2cpp::PyFunction fn;
  fn.load("mymodule", "myfunction");
  py2cpp::pyResult(s,d) = fn(1,2);
  ...
  std::cout << "String parameter from the python function:" << s << std::endl;
  std::cout << "Double parameter from the python function:" << d << std::endl;
  ...
  Py_Finalize();
________________________________________________________________________________

The full example which also deals with possible errors, can be this:

________________________________________________________________________________
  #include "TypeConversions.hxx"
  #include "Result.hxx"
  #include "PyFunction.hxx"

  #include <iostream>

  int main()
  {
    Py_Initialize();
    {
    std::string s;
    double d;
    py2cpp::PyFunction fn;
    fn.load("mymodule", "myfunction");
    if(!fn)
    {
      std::cerr << "Impossible to load myfunction from the module mymodule!";
      std::cerr << std::endl;
      std::cerr << py2cpp::getLastPyError();
    }
    else
    {
      try
      {
        py2cpp::pyResult(s,d) = fn(1, 2);
        std::cout << "String parameter from the python function:" << s << std::endl;
        std::cout << "Double parameter from the python function:" << d << std::endl;
      }
      catch(const py2cpp::Exception& err)
      {
        std::cerr << err.what();
      }
    }
    }
    Py_Finalize();
    return 0;
  }
________________________________________________________________________________