[C++-sig] Expose c++ class as python module

2010-11-09 Thread Simon W 
Hi,
I want to export my c++ class and make an instance of it and then expose it
to python as if it were a python module. Is it possible?

// export and create instance
class_ [...];

namespace["instance"] = ptr( instanceOfMyClass );


Then in python:

import instance

instance.someFunction()

Thank you! /Simon
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Re: [C++-sig] Expose c++ class as python module

2010-11-09 Thread Jim Bosch 

On 11/09/2010 12:31 PM, Simon W wrote:

Hi,
I want to export my c++ class and make an instance of it and then expose
it to python as if it were a python module. Is it possible?

// export and create instance
class_ [...];

namespace["instance"] = ptr( instanceOfMyClass );


Then in python:

import instance

instance.someFunction()



This is not possible to do directly, as boost::python::class_ makes a 
Python type object, and that's fundamentally different from a Python 
module object.


You can simulate this by doing tricks on the Python side, however:

 - Make a regular Boost.Python module.

 - In your module-that-mimics-a-class (pure Python), instantiate your 
instance in Python as a hidden module-level variable.


 - Extract bound methods from the instance and assign them to 
module-level variables.



Jim Bosch

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