Hi Renato,
I've really appreciated your answer. It's solved my issue.
I will never find that I need to call base constructor explicitly.
Thank you,
Nodir
Renato Araujo <rena...@gmail.com> writes:
> Hi Nodir,
>
>
> I saw a problem in your exemple. But I did not know if is this your
> problem, but try call the base constructor in your "PyTestPlugin"
> constructor, like that:
>
>> class PyTestPlugin(IBasePlugins):
>> def __init__(self):
> IBasePlugins.__init__(self) <<<<<<<<<<<<<<< here this need
> be called explicitly
>> self.handle_type = 2
>> def canHandle(self, type):
>> return type == handle_type
>> def handle(self):
>> print "handle() from python plugin"
>
> BR
> Renato Araujo Oliveira Filho
>
>
>
>
> On Fri, Aug 7, 2009 at 3:54 PM, Nodir GULYAMOV<gelv...@gmail.com> wrote:
>> Hello All,
>> I am trying to implement plug-ins system using BOOST Python but a little
>> stuck. I've read documentation a couple of times and have feeling that
>> missed something pretty simple.
>> Below simplified version what I am trying to do:
>>
>> // abstract Base interface class
>> class IBasePlugins
>> {
>> public:
>> virtual ~IBasePlugins() {};
>> virtual bool canHandle(int type) = 0;
>> virtual void handle() = 0;
>> };
>>
>> //some C++ internal plugin (no need to expose to python)
>> class IntrPlugin : public IBasePlugins
>> {
>> public:
>> IntrPlugin() : handle_type(1) {}
>> bool canHandle(int type) {
>> return type == handle_type;
>> }
>> void handle() {
>> std::cout << "handle() from internal plugin" << std::endl;
>> }
>> private:
>> int handle_type;
>> };
>>
>>
>> // class to manage plug-ins
>>
>> typedef boost::shared_ptr<IPlugins> PluginsPtrType;
>> typedef vector<PluginsPtrType> VPluginsType;
>>
>> class PluginsMgr
>> {
>> public:
>> static void register(PluginsPtrType plugin) {
>> vplugins.puch_back(plugin);
>> }
>> static void run(int type) {
>> VPluginsType::iterator it;
>> for(it = vplugins.begin(); it != vplugins.end(); it++)
>> if( (*it)->canHandle(type) ) (*it)->handle();
>> }
>> private:
>> VPluginsType vplugins;
>> };
>>
>> // export to python
>> struct IBasePluginsWrap : public IBasePlugins {
>> IBasePluginsWrap(PyObject* self_): self(self_) {}
>> bool canHandle(int type) {
>> return call_method< bool >(self, "canHandle", type);
>> }
>> void handle() {
>> call_method< void >(self, "handle");
>> }
>>
>> PyObject* self;
>> };
>>
>> BOOST_PYTHON_MODULE(pyPlugins)
>> {
>> class_< IBasePlugins, IBasePluginsWrap, boost::noncopyable
>> >("IBasePlugins")
>> .def("canHandle", pure_virtual(&IBasePlugins::canHandle))
>> .def("handle", pure_virtual(&IBasePlugins::handle))
>> ;
>>
>> class_< PluginsMgr >("PluginsMgr")
>> .def("registerPlugin", &PlgMgr::registerPlugin)
>> .staticmethod("registerPlugin")
>> .def("run", &PlgMgr::run)
>> .staticmethod("run")
>> ;
>>
>> register_ptr_to_python<PluginsPtrType>();
>> }
>>
>>
>> Then I am using it from python as follows:
>>
>> from pyPlugins import *
>>
>> class PyTestPlugin(IBasePlugins):
>> def __init__(self):
>> self.handle_type = 2
>> def canHandle(self, type):
>> return type == handle_type
>> def handle(self):
>> print "handle() from python plugin"
>>
>>
>> pm = PluginsMgr()
>> testplg = PyTestPlugin()
>> pm.registerPlugin(testplg)
>>
>> And have error that C++ signature mismatch.
>>
>> Thank you in advance. I will really appreciate any help.
>>
>> Kind regards,
>> Nodir
>> _______________________________________________
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>> Cplusplus-sig@python.org
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>>
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