Python C++

[Francois Fernandes]

Hi!

Is it possible to easyly integrate c++ classes in python?

I don't want to use boost c++.

Does anyone know how to start or where to find documentation for this?

thx

 

[Phil Thompson]

Hi!

Is it possible to easyly integrate c++ classes in python?

I don't want to use boost c++.

Does anyone know how to start or where to find documentation for this?

http://www.river-bank.demon.co.uk/docs/sip/sipref.html

Phil

 

[=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=]

Does anyone know how to start or where to find documentation for this?

I would use the standard C API:

http://docs.python.org/ext/ext.html
http://docs.python.org/api/api.html

Regards,
Martin

 

[Mike Thompson]

Hi!

Is it possible to easyly integrate c++ classes in python?

I don't want to use boost c++.

Does anyone know how to start or where to find documentation for this?

thx

Your choices are:
- SWIG http://www.swig.org/
- SIP (Phil Thompson has already provided the URL)
- Boost.Python (you already know about this it appears)

 

[John J. Lee]

http://www.river-bank.demon.co.uk/docs/sip/sipref.html

Excellent -- looks like comprehensive documentation with enough of a
tutorial element to smooth the path a bit. Boost Python has some
competition.

(sip has been around for a long time, but until recently there were no
docs to speak of.)

SWIG used to be pretty poor for wrapping C++. Has it got better?


John

 

[Humpdydum]

Is it possible to easyly integrate c++ classes in python?

SWIG used to be pretty poor for wrapping C++. Has it got better?

A couple of months ago when I looked at SWIG, it seemed to support almost
every C++ feature (templates and all), but I ended up not needing it so I
can't say how that translates in practice.

One problem with Boost is that it is such a big library and you have to get
the whole thing even if you just need a couple of "packages".

Oliver

 

[Helmut Jarausch]

Hi!

Is it possible to easyly integrate c++ classes in python?

I don't want to use boost c++.

Does anyone know how to start or where to find documentation for this?

I prefer PyCXX http://cxx.sourceforge.net


--
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

 

[Neal D. Becker]

I prefer PyCXX http://cxx.sourceforge.net

Looks interesting. I want to expose lots of signal processing algorithms
written in C++ to python. I want to use std::vector for containers,
because they are fast. I need to create python types for
std::vector<double> and std::vector<std::complex<double>> at minimum. The
Python interface doesn't need to know much about these types, just be able
to create vectors of a given size.

Would PyCXX be a good choice for this? Are there any samples of code
similar to this?

 

[Helmut Jarausch]

Helmut Jarausch wrote:




Looks interesting. I want to expose lots of signal processing algorithms
written in C++ to python. I want to use std::vector for containers,
because they are fast. I need to create python types for
std::vector<double> and std::vector<std::complex<double>> at minimum. The
Python interface doesn't need to know much about these types, just be able
to create vectors of a given size.

Would PyCXX be a good choice for this? Are there any samples of code
similar to this?

I think, yes. PyCXX allows for use of the STL.
For each type FOO in your module you provide a new_FOO which is called when you
create an object. There you can call any C++ code including class constructors.
PyCXX helps you in filling out these long structs needed for a new type.
It helps with exception handling and reference counting.
I am new to PyCXX myself, but it worked very soon. There is a rather general
example in the Demo directory. I've just copied and modified the code and it
worked like expected - GREAT! The documentation is not too long but suffucient
and very readable. It does NOT (try to) wrap your C++ classes automatically like
other tools. I prefer this (since I don't have hundreds of classes). One can
easily fully understand what's going on and if something is missing (e.g. I think
conversion of an unsigned int to a Python long int) one can easily add this
feature using calls from the C-API himself.


--
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

 

[Helmut Jarausch]

Helmut Jarausch wrote:




Looks interesting. I want to expose lots of signal processing algorithms
written in C++ to python. I want to use std::vector for containers,
because they are fast. I need to create python types for
std::vector<double> and std::vector<std::complex<double>> at minimum. The
Python interface doesn't need to know much about these types, just be able
to create vectors of a given size.

Would PyCXX be a good choice for this? Are there any samples of code
similar to this?

I think, yes. PyCXX allows for use of the STL.
For each type FOO in your module you provide a new_FOO which is called when you
create an object. There you can call any C++ code including class constructors.
PyCXX helps you in filling out these long structs needed for a new type.
It helps with exception handling and reference counting.
I am new to PyCXX myself, but it worked very soon. There is a rather general
example in the Demo directory. I've just copied and modified the code and it
worked like expected - GREAT! The documentation is not too long but suffucient
and very readable. It does NOT (try to) wrap your C++ classes automatically like
other tools. I prefer this (since I don't have hundreds of classes). One can
easily fully understand what's going on and if something is missing (e.g. I think
conversion of an unsigned int to a Python long int) one can easily add this
feature using calls from the C-API himself.


--
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany