Boost Python error "No to_python (by-value) converter found..."

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I'm posting this here because I had a maddening search for information about why this error occurs when trying to do certain tasks in a Boost Python binding to a C++ object:

  TypeError: No to_python (by-value) converter found for C++ type: Element*

This was when trying to iterate over a vector, defined as:

  typedef std::vector<Element*> ElementList;

It turns out that in your `class_<>` definitions you have to be pretty specific. I already had:

  class_<Element>("Element")
  ...

but what solved this error was to specify that this class could _also_ have a pointer type:

  class_<Element, Element*>("Element")
  ...

After adding the pointer type to the class definition, the error went away!