How to configure Emacs for literate programming?

Question

I would like to use Emacs for literate programming.

I want my code to look like this .

<<class Hufftree definition>>=
template<typename DataType, typename Frequency> class Hufftree
{
public:
  Hufftree public members
private:
  Hufftree private members
};

In org-babel I can't give names to my code snippets which are spread all over the document and collect them together as shown below. Whenever I compile I want the tool to automatically insert <<member functions>> wherever I refer them.

Some text here. Blah blah...

<<my foo class>> ==
#+begin_src ruby 
class Foo{
    <<member functions>>
}
#+end_src

Something random to say about some other things. 

<<member functions>> ==
#+begin_src 
// code for member functions goes here 
#+end_src

Answer 1

You might want to check out Noweb, which allows literate programming in almost any language with LaTeX or Sphinx/reStructuredText syntax; you can see an example here).

You could then use the standard Emacs LaTeX writing facilities and maybe mix with a multiple-major mode to edit the code portions.