Mailman 3 August 2005 - Cplusplus-sig

Mapping an entire data structure over to a single Python instance. (Newbie question)
by Gerard Murphy Aug. 13, 2005

Aug. 13, 2005

Hello, I'm evaluating the potential use of the Boost.Python facilities. I've looked though the tutorial and *some* of the detailed API documentation available from www.boost.org, and so far it all looks very promising. However... I have a rather strange use planned for the C++ to Python interface that isn't covered by the tutorial. The detailed API documentation doesn't seem to answer my question either; so I'd like to put it to the mailing list, as I'm sure that this idea has already occurred to somebody in the past. *** Background *** What I'd like to do is map an entire data structure over to a single Python instance, so that individual properties of the Python object would correspond to parts of the data structure. To add spice to this, the data structure is in a sense weakly typed: different parts of it are composed out of very different C++ types. The data structure is dynamically built (otherwise there wouldn't be in issue as I could map a C-style structure or getter/setter class over to a Python class using the techniques described in the tutorial). I'll make this a little bit more concrete:- 1. I have what is effectively a weakly typed wrapper around a set of different C++ types using external polymorphism:- class AbstractValue { public: ~virtual AbstractValue(); }; template <typename StrongType> class ConcreteValue: public AbstractValue { public: // Use compiler-generated destructor. ConcreteValue(const StrongType &valueRepresentation): _valueRepresentation(valueRepresentation) StrongType _valueRepresentation; }; Instances of these make their way into a map:- typedef std::map<std::string, boost::shared_ptr<AbstractValue> > DataStructure; 2. Various things in the system populate these maps in different ways, so that from one map instance to another, not only do the associated values change, but so do the number of associations, the keys and the actual types of the associated values. However, lots of these maps share the same common structure in terms of numbers of associations, keys and associated types. These could be thought of as instances of several classes, where each class captures the commonality of structure. These classes effectively come into being as the system runs: they cannot be defined at compile time as conventional C++ classes. No, I can't just write the entire system in Smalltalk (or Python for that matter) ... :-) 3. I'd like to expose these conceptual classes to Python, mapping over these instances of 'DataStructure' mentioned above to Python objects - but with the Python class changing depending on what instance of 'DataStructure' is being mapped. The classes of the Python objects would be dynamically created by construction of a 'class_' object:- // Somewhere this line will be repeatedly executed... boost::python::class_<DataStructure> classObject(name); I'm assuming that although the class_ object will be destroyed at each repetition, the corresponding Python class lives on afterwards. It isn't a problem if this is not the case, as I could always manage these objects in a long-lived container or on the heap or whatever. What I intend to do is to dynamically add properties to 'classObject' that use the name of the property to fetch the appropriate associated value from the map. This would be done once per repetition, so that each repetition would create a brand new Python class. To be a bit more specific, I want to call 'classObject.add_property()' with an application of boost::bind to a template function instantiation that takes a name, looks up the associated value in the map, dynamically casts to the template type parameter and returns the value. I can ask an exemplar map to walk itself so that on behalf of a set of maps sharing the same common structure, it will populate a single class object with the appropriate properties. *** Now for the questions *** OK, that's what I want to do ... but can I do the following first:- i) Can I construct more than one instance of 'class_<DataStructure>' using lots of different names as arguments at each construction call? I get the impression from the documentation that each template instantiation of 'class_ <X>' for a given X might well be a singleton class in terms of usage - only one constructed instance per class template instantiation, if you know what I mean! ii) If I *can* have lots of instances of 'class_<DataStructure>', how does the framework know how to map instances of 'DataStructure' to the appropriate Python class - this seems to be implicitly done rather than explictly done. What I'm driving at here is taking an *existing* instance of DataStructure and wrapping it up as a 'boost::python::object' whose Python type is one of these dynamically constructed classes. This is in contrast to using the 'class_<DataStructure>' object to create the instance of 'boost::python::object' - I would definitely like to avoid doing this if possible, although I appreciate that it is usually the obvious way to go. NOTE: I'm assuming that the properties can be defined using *any* function object that would take an instance of 'DataStructure' and return an appropriately typed value - I am planning on using 'boost::bind' and an appropriate trampoline template function to do this. In the meantime, I'll have a longer trawl through the API documentation and perhaps the implementation source, but I'd appreciate any help from old hands to shorten the process. Many thanks in advance, Gerard

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how do I instantiate templates in pyste with types defined in different files?
by Alexis H. Rivera-Rios Aug. 12, 2005

Aug. 12, 2005

Hi, I'm trying to do something like the following. Let say I have a file test.h that contains the following code: template <class A, class B> class Test { A a; B b; }; Now I want to export an instanciate this template class using the types Astruct1, Astruct2 defined in atruct1.h and astruct2.h respectively. In pyste, I write this: Test = Template("Test","test.h") Test(["Astruct1","Astruct2","Test1") When I try to compile this I get an error because the temporary file that is generated only includes test.h and it doens't now where the other types come from. What is the best way to handle this? Is there a way to specify additional include files when I try to instantiate this code? Or should I write code that does the appropriate instanciation and then export that? Thanks, Alexis Programming Tutorial: In Python: To do this, do this In Perl: To do this, do this or this or this or this... In C: To do this, do this, but be careful In C++: To do this, do this, but don't do this, be careful of this, watch out for this, and whatever you do, don't do this __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Re: [C++-sig] Is there a good Python C/C++ IDE?
by Hubert Holin Aug. 12, 2005

Aug. 12, 2005

[Xposted and followups to pythonmac list which is perhaps more appropriate] Somewhere in the E.U., le 12/08/2005 Bonjour On 12 août 2005, at 12:00, c++-sig-request(a)python.org wrote: > Date: Thu, 11 Aug 2005 13:49:08 -0400 > From: Scott Kaplan <pythondeveloper(a)gmail.com> > Subject: [C++-sig] Is there a good Python C/C++ IDE? > To: Development of Python/C++ integration <c++-sig(a)python.org> > Message-ID: <86afeadf05081110495776a14b(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Being new to Python, I was wondering if anyone knows of a good IDE > that would let me develop Python and add extensions in C/C++, with the > capability of debugging those extensions. > > This will be on a Mac. > > It looks like the standard download comes with PyObjC, however I want > to extend Python to handle my C/C++ extensions not the other way > around + I don't want to have to learn any ObjectiveC / ObjC syntax. > > Thanks, Well, if you do not want to create GUIs, but do want to use one, it is possible to use XCode (2.1, though the last few previous versions would presumably also work). More precisely, you can launch the command-line Python from within XCode with a chosen script as argument (and any other arguments you may care about), and of course you can do the C++ programming within that environment. I have not actually tried to have a custom Python extension used in such a setting, but it is in my current work plan. You can even use the free (and excellent) TextWrangler as the code editor (for C++ and Python). The debugging of the extension can then be done using XCode's front-end to GDB. For debugging of Python scripts proper, however, the (free) PythonIDE is preferable, though (which leads to: development of scripts within PythonIDE, extension coding and integration in XCode). You are, as well, not restricted to using the Apple-supplied version of Python. As an example, I installed Bob Ippolito's "Official Unofficial" Python 2.4.1. I then created an XCode project (***empty project***) "Python via XCode", added a target "Invoked Snake" (of type aggregate), and to it added a custom executable "Python 2.4.1 (Official Unofficial)", setting its properties as "Executable path: / Library/Frameworks/Python.framework/Versions/2.4/bin/python" and with an argument ""/Users/hubertholin/Documents/Scratch/Python via Xcode/ test.py"" (adding quotes around path arguments is safer... note the whitespaces). Clicking on the "Build and Go" icon then invoked python with my test script as argument. The creation of extensions should be straightforward from the Boost.Python documentation (so far, I have only tried embedding, not extension, which is on my to-do list). I am still trying to refine the process to something I like, though. As far as Objective-C and Objective-C++ are concerned, I only see them as something of an inconvenience, much as in the same way that Apple's system documentation had long been geared towards Pascal rather than C. PyObjC goes a long way to ease our suffering, though there are some rough spots still (and the Python Carbon bindings need a full overhaul). It should be said that Interface Builder is superb, though, and in the absence of a NIB to whatever- portable-package Python will understand (like there appears to be for PERL), if one wants GUIs, then building them in IB, using PyObjC as the glue (using documentation written for ObjC) and extending with C+ + is a possible road. At least that's the road I am taking, and if anybody's interested I'll report back if it actually leads somewhere :-) . Bon courage Hubert Holin

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Python interpreter crashes after trying to callback a python function with PyObject_CallObject from a dll
by Oleg Novychny Aug. 10, 2005

Aug. 10, 2005

Hello guys, Im still implementing my callback to python from my dll and the python interpreter crashes I have no idea atm why I use the calldll module for calling my c++-dll from my module calldllsound.py: import calldll import struct class CallSoundDLL: def __init__(self, library): self.library = library def myGetResults(a): print a #just for debugging calldll.call_foreign_function (self.addrGet,'llllll','i',(self.ulHz.address(), self.dNoise.address(), self.bAudio.address(),self.bCrackFlag.address(), self.dSNR.address(), self.bBeep.address())) def mySetCallback(self): calldll.call_foreign_function (self.addrCall,'O','',(self.myGetResults,)) def start(self): # --------------------------------------------------------------------------------------------- # Get the handle of the dll and the address of the function # --------------------------------------------------------------------------------------------- #Get the handle of the Dll handle = calldll.load_library (self.library) #Get the address of the functions self.addrStart = calldll.get_proc_address (handle, 'StartProcessing') self.addrEnd = calldll.get_proc_address (handle, 'EndProcessing') self.addrGet = calldll.get_proc_address (handle, 'GetResults') self.addrCall = calldll.get_proc_address (handle, 'my_set_callback') # --------------------------------------------------------------------------------------------- # Initialization # --------------------------------------------------------------------------------------------- self.ulHz = calldll.membuf(4) #unsigned long* self.dNoise = calldll.membuf(8) #double* self.bAudio = calldll.membuf(4) #int* self.bCrackFlag = calldll.membuf(4) #int* self.dSNR = calldll.membuf(8) #double* self.bBeep = calldll.membuf(4) #int* # --------------------------------------------------------------------------------------------- # Function calling # --------------------------------------------------------------------------------------------- args = (1,1,1,1,1,1000) calldll.call_foreign_function (self.addrStart,'iiiiik','i',args) So Im starting my dll on such a way: >>> import calldllsound >>> obj = calldllsound.CallSoundDLL("soundproclib.dll") >>> obj.start() It works without any problems. But after the following command crashes the python interpreter...: >>> obj.mySetCallback() Here is my_set_callback function from my dll, which have to be called in the python function mySetCallback: static PyObject *my_callback = NULL; PyMODINIT_FUNC my_set_callback(PyObject *args) { PyObject *temp = args; Py_XINCREF(temp); /* Add a reference to new callback */ Py_XDECREF(my_callback); /* Dispose of previous callback */ my_callback = temp; /* Remember new callback */ Py_INCREF(Py_None); bPyCallBackFlag = true; }; and here is the part of my code from the same c++-file where Im trying to call my python-function myGetResults: if (bPyCallBackFlag) { /* Time to call the callback */ ppyobjArgList = Py_BuildValue("(i)",123); //just for debugging // Here crashes the python interpreter, I found it out with // error logging: ppyobjResult = PyObject_CallObject(my_callback, ppyobjArgList); Py_DECREF(ppyobjResult); } Have anybody any idea why it doesnt work? Thank you very much Oleg --------------------------------- Gesendet von Yahoo! Mail - Jetzt mit 1GB kostenlosem Speicher

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Re: [C++-sig] to_python / from_python guidance?
by Alexis H. Rivera-Rios Aug. 9, 2005

Aug. 9, 2005

Pierre, I figured out the problem. The problem was exactly what you said. I didn't need the Vrjuggler libraries since I already had the python bindings from the ggt code. What happened was that in building the python bindings, the release version of python boost was used and I was compiling my code in debug mode using the debug version of python boost. I linked my code againts the release version of python boost and it worked as expected. Thanks, Alexis Programming Tutorial: In Python: To do this, do this In Perl: To do this, do this or this or this or this... In C: To do this, do this, but be careful In C++: To do this, do this, but don't do this, be careful of this, watch out for this, and whatever you do, don't do this __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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polymorphic object handling
by Burkhard Doliwa Aug. 9, 2005

Aug. 9, 2005

Hi all, I have a problem wrapping a factory function to python. I have two abstract base classes A,B, with some child classes A<-A1,A2,A3 B<-B1,B2,B3 every child class is either able to clone itself or to return an instance of the corresponding "parallel class", i.e. A* A1::cloneA() const yields an A1 B* A1::cloneB() const yields an B1 A* B2::cloneA() const yields an A2 B* B2::cloneB() const yields an B2 and so forth. The factory function object factoryA(const A&, bool isA) { return isA? object(A.cloneA()) : object(A.cloneB()); } only returns python objects of the base class types, not the derived classes, i.e. >>> a1=A1() >>> factory(a1,True) result= A object (NOT an A1 object) How could I create the correct derived class in such a conditional factory function (like the return_value_policy<manage_new_object>() case)? Thanks, Burkhard

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CFP: IEEE in cooperated International Conference on Intelligent Agents, Web Technologies and Internet Commerce
by Mohammadian, Masoud Aug. 9, 2005

Aug. 9, 2005

CFP: IEEE in cooperated International Conference on Intelligent Agents, Web Technologies and Internet Commerce CALL FOR PAPERS International Conference on Intelligent Agents, Web Technologies and Internet Commerce http://www.ise.canberra.edu.au/conferences/iawtic05/ Jointly with International Conference on Computational Intelligence for Modelling, Control and Automation 28 - 30 November 2005 Vienna, Austria http://www.ise.canberra.edu.au/conferences/cimca05/ In co-operation with IEEE the conference Proceedings will be published as books by IEEE in USA International Conference on Intelligent Agents, Web Technology and Internet Commerce - IAWTIC'2005 provides a medium for researchers and practitioners to exchange and explore the issues and opportunities in the area of intelligent agent, web technologies and Internet commerce. The conference will consist of both plenary sessions and contributory sessions, focusing on theory, implementation and applications of intelligent agents, web technologies and Internet commerce. Conference Proceedings will be published as books by IEEE (The Institute of Electrical and Electronic Engineering) in USA and will be index world wide. All papers will be peer reviewed by at least two reviewers. Conference Topics Include (but not limited to): Intelligent Agents ^^^^^^^^^^^^^^^^^^ Knowledge Management Intelligent Business Agents Agent Architectures Environments and Languages Adaptation and learning for agents Human and agent interaction Interface agents Mobile agents Virtual agent-based marketplaces Agents and uncertainty The privacy issues for agents Automated shopping and trading agents Agent-oriented services Social implications for agent Conceptual modelling and design of Ontologies for agents Agents and e-commerce Legal aspects of agents in e-commerce Performance measurement of e-commerce agents Rational information agents and electronic commerce Auction and negotiation for e-commerce agents Web Technologies ^^^^^^^^^^^^^^^^ Web data mining and information retrieval Agent-based trade-and mediating services Teaching on Web Virtual trading institutions Internet Commerce ^^^^^^^^^^^^^^^^^ E-commerce applications of Knowledge Representation Reasoning Techniques Electronic Payment Systems Internet Marketing Intranets and Extranets Electronic Payment Systems Electronic Data Interchange Supply Chain Management Electronic Payment Systems Internet-based Electronic Commerce Virtual Communities/Community Networks Logistics Issues for Electronic Commerce Business Reengineering Issues for Electronic Commerce Government Electronic Procurement and Service Delivery Legal, Auditing or Security Issues for Electronic Commerce Requirements Engineering Approaches for Electronic Commerce Knowledge Discovery, Intelligent Information Systems Knowledge Clustering Classification Call for papers Papers will be selected based on their originality, significance, correctness, and clarity of presentation. Papers (4 pages or more) should be submitted to the following e-mail or postal address: E-mail submission of draft papers to: iawtic(a)canberra.edu.au Postal Submission of draft papers to: IAWTIC'2003 Secretariat School of Information Sciences and Engineering, University of Canberra, ACT, Canberra, 2616, Australia Papers should present original work, which has not been published or being reviewed for other conferences. Papers should be written in English. The name and affiliation of authors should be omitted on the paper. A separate page must be included with each paper, containing, the names, affiliations, postal address and e-mail addresses of authors as well as the address of contact author. E-mail submission of draft papers are encouraged. Important Dates 31 August 2005 Submission of draft papers 30 September 2005 Notification of acceptance 21 October 2005 Deadline for camera-ready copies of accepted papers 28-30 November 2005 Conference sessions International Programme Committee A. Agah, The University of Kansas, USA J. P. Bigus, IBM T.J. Watson Research Center, USA E. André, Universität Augsburg, Germany Katia Sycara, Carnegie Mellon University, USA H. Adeli, The Ohio State University, USA B. Kosko, University of Southern California, USA A. Kandel, University of South Florida, USA T. Fukuda, Nagoya University, Japan T. Baeck, Informatic Centrum Dortmund, Germany J.Bezdek, University of West Florida, USA M. Mohammadian University of Canberra, Australia K. Hirota, Tokyo Institute of Technology, Japan G. Dorffner, University of Vienna, Austria E. Oja, Helsinki University of Technology, Finland W. Pedrycz, University of Manitoba, Canada H. R. Berenji, NASA Ames Research Center, USA R. C. Eberhart, Purdue University,USA T. Shibata, MITI, Ministry of International Trade and Industry, Japan H. Liljenstrom, Royal Institute of Technology, Sweden A. Y. Zomaya, University of Western Australia, Australia F. Herrera, University of Granada, Spain A Jafari, Indiana University Purdue University Indianapolis, IUPUI, USA A. Bulsari, AB Nonlinear Solutions OY, Finland B. Bignall, Monash University, Australia J. D. Pinter, Dalhousie University, Canada V. Piuri, Politecnico di Milano, Italy T. Furuhashi, Nagoya University, Japan A. Aamodt, Norwegian University of Science and Technology, Norway J. Fernandez de Cañete, University of Malaga, Spain W. Duch, Nicholas Copernicus,University, Poland E. Tulunay, Middle East Technical University, Turkey L. Guan, University of Sydney, Australia C. Kuroda, Tokyo Institute of Technology, Japan T. Yamakawa, Kyushu Institute of Technology, Japan J. Liu, Hong Kong Baptist University, Hong Kong A. Namatame, National Defense Academy, Japan

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CFP: IEEE in cooperated International Conference on Computational Intelligence for Modelling, Control and Automation
by Mohammadian, Masoud Aug. 9, 2005

Aug. 9, 2005

CFP: IEEE in cooperated International Conference on Computational Intelligence for Modelling, Control and Automation CALL FOR PAPERS International Conference on Computational Intelligence for Modelling, Control and Automation 28 - 30 November 2005 Vienna, Austria http://www.ise.canberra.edu.au/conferences/cimca05/ In co-operation with: IEEE Computational Intelligence Society Conference Proceedings will be published as books by IEEE in USA Sponsored by: European Society for Fuzzy Logic and Technology - EUFLAT International Association for Fuzzy Set in Management and Economy - SIGEF Japan Society for Fuzzy Theory and Intelligent Informatics - SOFT Taiwan Fuzzy Systems Association - TFSA World Wide Web Business Intelligence - W3BI Hungarian Fuzzy Association - HFA University of Canberra Jointly with International Conference on Intelligent Agents, Web Technologies and Internet Commerce http://www.ise.canberra.edu.au/conferences/iawtic05/ Honorary Chair: Lotfi A. Zadeh, University of California, USA Stephen Grossberg, Boston University, USA The international conference on computational intelligence for modelling, control and automation will be held in Vienna, Austria on 28 to 30 November 2005. The conference provides a medium for the exchange of ideas between theoreticians and practitioners to address the important issues in computational intelligence, modelling, control and automation. The conference will consist of both plenary sessions and contributory sessions, focusing on theory, implementation and applications of computational intelligence techniques to modelling, control and automation. For contributory sessions, papers (4 pages or more) are being solicited. Several well-known keynote speakers will address the conference. Conference Proceedings will be published as books by IEEE (The Institute of Electrical and Electronic Engineering) in USA and will be index world wide. All papers will be peer reviewed by at least two reviewers. Topics of the conference include, but are not limited to, the following areas: Modern and Advanced Control Strategies: Neural Networks Control, Fuzzy Logic Control, Genetic Algorithms and Evolutionary Control, Model-Predictive Control, Adaptive and Optimal Control, Intelligent Control Systems, Robotics and Automation, Fault Diagnosis, Intelligent agents, Industrial Automations Hybrid Systems: Fuzzy Evolutionary Systems, Fuzzy Expert Systems, Fuzzy Neural Systems, Neural Genetic Systems, Neural-Fuzzy-Genetic Systems, Hybrid Systems for Optimisation Data Analysis, Prediction and Model Identification: Signal Processing, Prediction and Time Series Analysis, System Identification, Data Fusion and Mining, Knowledge Discovery, Intelligent Information Systems, Image Processing, and Image Understanding, Parallel Computing applications in Identification & Control, Pattern Recognition, Clustering and Classification Decision Making and Information Retrieval: Case-Based Reasoning, Decision Analysis, Intelligent Databases & Information Retrieval, Dynamic Systems Modelling, Decision Support Systems, Multi-criteria Decision Making, Qualitative and Approximate-Reasoning Paper Submission Papers will be selected based on their originality, significance, correctness, and clarity of presentation. Papers (4 pages or more) should be submitted to the following e-mail or the following address: CIMCA'2005 Secretariat School of Information Sciences and Engineering University of Canberra, Canberra, 2616, ACT, Australia E-mail: cimca(a)canberra.edu.au Electronic submission of papers (either by E-mail or through conference website) is preferred. Draft papers should present original work, which has not been published or being reviewed for other conferences. Important Dates 31 August 2005 Submission of draft papers 30 September 2005 Notification of acceptance 21 October 2005 Deadline for camera-ready copies of accepted papers 28-30 November 2005 Conference sessions Special Sessions and Tutorials Special sessions and tutorials will be organised at the conference. The conference is calling for special sessions and tutorial proposals. All special session proposals should be sent to the conference chair (by email to: masoud.mohammadian(a)canberra.edu.au) on or before 5th of August 2005. CIMCA'05 will also include a special poster session devoted to recent work and work-in-progress. Abstracts are solicited for this session. Abstracts (3 pages limit) may be submitted up to 30 days before the conference date. Visits and social events Sightseeing visits will be arranged for the delegates and guests. A separate program will be arranged for companions during the conference. Further Information For further information either contact cimca(a)ise.canberra.edu.au or see the conference homepage at: http://www.ise.canberra.edu.au/conferences/cimca05/default.htm Organising Committee Chair: Masoud Mohammadian, University of Canberra, Australia International Program Committee: H. Adeli, The Ohio State University, USA W. Pedrycz, University of Manitoba, Canada A. Agah, The University of Kansas, USA T. Fukuda, Nagoya University, Japan J. Bezdek, University of West Florida, USA R. C. Eberhart, Purdue University, USA F. Herrera, University of Granada, Spain T. Furuhashi, Nagoya University, Japan A. Agah, The University of Kansas, US E. André, Universität Augsburg, Germany A. Kandel, University of South Florida, USA J. P. Bigus, IBM T. J. Watson Research Center, USA J. Liu, Hong Kong Baptist University, Hong Kong A. Namatame, National Defense Academy, Japan K. Sycara, Carnegie Mellon University, USA B. Kosko, University of Southern California, USA T. Baeck, Informatic Centrum Dortmund, Germany K. Hirota, Tokyo Institute of Technology, Japan E. Oja, Helsinki University of Technology, Finland H. R. Berenji, NASA Ames Research Center, USA H. Liljenstrom, Royal Institute of Technology, Sweden A. Bulsari, AB Nonlinear Solutions OY, Finland J. Fernandez de Cañete, University of Malaga, Spain W. Duch, Nicholas Copernicus University, Poland E. Tulunay, Middle East Technical University, Turkey C. Kuroda, Tokyo Institute of Technology, Japan T. Yamakawa, Kyushu Institute of Technology, Japan J. Liu, Hong Kong Baptist University, Hong Kong A. Namatame, National Defense Academy, Japan A. Aamodt, Norwegian University of Science & Technology, Norway International Liaison: Canada and USA Liaison: Robert John, De Montfort University, UK Nasser Jazdi, Institut für Automatisierungs- und Softwaretechnik, Germany Europe Liaison: Dr. Eng. Djamel Khadraoui, Centre de Recherche Public, Luxembourg Frank Zimmer, SES ASTRA, Luxembourg Asia Liaison: Renzo Gobbin, University of Canberra, Australia R. Amin Sarker, ADFA, Australia Local Arrangements and Public Relation: Zohreh Pahlavani, AVIP, Austria C Meier, Australia Publicity: C. Meier, Australia Zohreh Pahlavani, AVIP, Austria Publication: Masoud Mohammadian, Australia In cooperation with: IEEE Computational Intelligence Society Conference Proceedings will be published as books by IEEE in USA University of Canberra, (Masoud Mohammadian) Universidad Carlos III de Madrid, (José-Luis Fernández-Villacañas Martín) University of Guelph, (Simon X. Yang)

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pyste, gccxml and boost ublas, random number generator etc
by Alexis H. Rivera-Rios Aug. 8, 2005

Aug. 8, 2005

Hi, Has anybody used pyste to expose C++ code that contained boost code from the random number generator libraries, ublas, shared_ptr? It seems when pyste compiles my code the gccxml cannot compile the libraries. I think this happens because the boost libraries that I have in windows are setup to compile with VC 7.1 and gccxml is based on another compiler so compiling the templates gets messed up. Example of compiler errors are: C:\Development\PyStatATA>pyste.py --module=PyStatATA -I c:\opt\Bayes++ -I ..\Sta tATA -I c:\usr\local\include -I C:\Boost\include\boost-1_32 -I C:\opt\newmat ..\ StatATA\pystatata.pyste In file included from C:/Boost/include/boost-1_32/boost/numeric/ublas/config.hpp :29, from C:/Boost/include/boost-1_32/boost/numeric/ublas/vector.hpp :22, from c:/opt/Bayes++/BayesFilter/matSupSub.hpp:41, from c:/opt/Bayes++/BayesFilter/bayesFlt.hpp:21, from c:/opt/Bayes++/BayesFilter/UDFlt.hpp:28, from c:/opt/Bayes++/BayesFilter/allFilters.hpp:19: C:/Boost/include/boost-1_32/boost/mpl/and.hpp:32:13: operator "defined" requires an identifier C:/Boost/include/boost-1_32/boost/mpl/and.hpp:32:13: ("and" is an alternative to ken for "&&" in C++) C:/Boost/include/boost-1_32/boost/mpl/and.hpp:32:16: missing '(' in expression C:/Boost/include/boost-1_32/boost/mpl/and.hpp:43:13: operator "defined" requires an identifier C:/Boost/include/boost-1_32/boost/mpl/and.hpp:43:13: ("and" is an alternative to ken for "&&" in C++) C:/Boost/include/boost-1_32/boost/mpl/and.hpp:43:16: missing '(' in expression In file included from C:/Boost/include/boost-1_32/boost/numeric/ublas/returntype _deduction.hpp:15, from C:/Boost/include/boost-1_32/boost/numeric/ublas/traits.hpp :27, from C:/Boost/include/boost-1_32/boost/numeric/ublas/storage.hp p:29, from C:/Boost/include/boost-1_32/boost/numeric/ublas/vector.hpp :23, from c:/opt/Bayes++/BayesFilter/matSupSub.hpp:41, from c:/opt/Bayes++/BayesFilter/bayesFlt.hpp:21, from c:/opt/Bayes++/BayesFilter/UDFlt.hpp:28, from c:/opt/Bayes++/BayesFilter/allFilters.hpp:19: C:/Boost/include/boost-1_32/boost/mpl/or.hpp:33:13: operator "defined" requires ... In file included from C:/Boost/include/boost-1_32/boost/random/linear_congruential.hpp:25, from C:/Boost/include/boost-1_32/boost/random.hpp:36, from ../StatATA/random_number_generator.h:6: C:/Boost/include/boost-1_32/boost/random/detail/const_mod.hpp: In static member function `static IntType boost::random::const_mod<IntType, m>::invert_euclidian(IntType)': C:/Boost/include/boost-1_32/boost/random/detail/const_mod.hpp:152: error: conflicting types for `typedef struct boost::static_assert_test<sizeof (boost::STATIC_ASSERTION_FAILURE<(bool)(boost::integer_traits<T>::is_signed)>)> boost_static_assert_typedef___COUNTER__' C:/Boost/include/boost-1_32/boost/random/detail/const_mod.hpp:148: error: previous declaration as `typedef struct boost::static_assert_test<sizeof (boost::STATIC_ASSERTION_FAILURE<(bool)((m > 0))>)> ... C:/Boost/include/boost-1_32/boost/shared_ptr.hpp:247: error: invalid conversion from `void*' to `const char*' ... The guys from gccxml think it's because they define their compiler as __GCCXML__ and boost doesn't recognize this. Has anybody run into this? Thanks, Alexis Programming Tutorial: In Python: To do this, do this In Perl: To do this, do this or this or this or this... In C: To do this, do this, but be careful In C++: To do this, do this, but don't do this, be careful of this, watch out for this, and whatever you do, don't do this __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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wrapping virtual function returning void
by Faheem Mitha Aug. 7, 2005

Aug. 7, 2005

Hi, Consider wrapping a class containg a virtual function returning void. The current method, which appears below for convenience, and is copied verbatim from the tutorial, seems to expect that the virtual function returns something. In other words, changing f to return void would break the code. Is this the case, or am I missing something? Please CC me on any reply. Thanks. Faheem. ********************************************************************* #include <boost/python.hpp> using namespace boost::python; struct Base { virtual ~Base() {} virtual int f() { return 0; } }; struct BaseWrap : Base, wrapper<Base> { int f() { if (override f = this->get_override("f")) return f(); // *note* return Base::f(); } int default_f() { return this->Base::f(); } }; BOOST_PYTHON_MODULE(hello) { class_<BaseWrap, boost::noncopyable>("Base") .def("f", &Base::f, &BaseWrap::default_f) ; } **********************************************************************

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