On 4/19/07, Stou Sandalski <[EMAIL PROTECTED]> wrote:
Thanks for the reply,
That is what I am doing now, the problem is that I need the code to be
in C/C++ inside the wrapper. I am creating a lot of these objects and
each time I am iterating over ~1.4 million points... and in python
it's quite slow.... which is unpleasant especially since it's such a
trivial operation. My calculation's in NumPy take seconds, and to
create an object for visualization I have to wait 2 minutes. =(
You can define function that first argument is a reference to the instance
of your class.
Then you can register it as usual function.
For example:
http://language-binding.net/pyplusplus/documentation/functions/transformation/built_in/input_c_buffer.html
take a look on generated source code( at the bottom of the page )
Thanks again,
Stou
On 4/19/07, Roman Yakovenko <[EMAIL PROTECTED]> wrote:
> On 19 Apr 2007 00:37:36 -0700, Stou Sandalski <[EMAIL PROTECTED]>
> wrote:
> > Hi,
> >
> > I have a python library created by wrapping the C++ library using
> > Boost.Python, the problem is that the wrappers are not very
> > pythonic.... so I want to add some methods that do not exist in the C+
> > + implementation, that would create a better Python interface.
> >
> > For example to initialize the data in an object in the library one
> > must iterate through every point, setting a value for each
> > individually. That's the way it works in C++ but in python it would
> > be nice to instead just have one call that can receive a numpy array
> > or a tuple. I want to add a call like: setData(array) to the python
> > object, a call that does not exist in the C++ implementation and then
> > in the C++ wrappers actually use setData to iterate through the array
> > and set the values using the normal C++ method, say setValue(index,
> > value).
> >
> > Something along the lines of this (initData is not in the constructor
> > on purpose) C++ object:
> >
> > class Foo
> > {
> > public:
> > void initData(int size)
> > {
> > data = new float[size];
> > }; // Create the data array
> > void setValue(int index, float value) // Set given value
> > {
> > data[index] = value;
> > }
> > private:
> > float *data;
> > };
> >
> >
> > In python however I want to do this:
> >
> > obj = foo()
> > ar = array([1,2,3,4,5], dtype=float)
> >
> > foo.setData(ar)
> >
> > Or even better:
> >
> > ar = array([1,2,3,4,5], dtype=float)
> > obj = foo(ar)
> >
> > And have it somehow call initData() and setValue() iteration inside
> > the C++ code of the wrapper. I've only used SWIG and don't really
> > know much about Boost, I am not even sure how to label what I am
> > trying to do.
> >
> > Can this be done with Boost, without changing the C++ library?
>
> Take a look on next link:
>
http://boost.org/libs/python/doc/tutorial/doc/html/python/techniques.html#python.extending_wrapped_objects_in_python
>
> > Regards,
> >
> > Stou
> >
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
>
>
> --
> Roman Yakovenko
> C++ Python language binding
> http://www.language-binding.net/
--
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/
--
http://mail.python.org/mailman/listinfo/python-list
