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.. highlight:: cpp
.. _gentut-globalheader:
The Global Header
=================
Besides the information provided by the typesystem, the generator needs to
gather more data from the library headers containing the classes to be exposed
in Python. If there is a header that include all the others (or just one, as is
the case of **libfoo**) this could be passed directly to the generator.
If such a file is not available, or only a subset of the library is desired, or
if some flags must be defined before parsing the library headers, then a
``global.h`` file must be provided.
The use of a ``global.h`` file is preferred if some macros must be defined
before the parser gather data from the headers. For example, if ``NULL`` is not
defined and it is used as a default paramater for some constructor or method,
the parser will not recognize it.
To solve this create a ``global.h`` including all the desired headers and the
defined (and undefined) flags as follows:
**foobinding/data/global.h**
::
#undef QT_NO_STL
#undef QT_NO_STL_WCHAR
#ifndef NULL
#define NULL 0
#endif
#include <foo.h>
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