[clam-devel] ipyclam: trouble with ProcessingConfigs

[David García Garzón]

Xavi, note that attributeValue is a const getter so you cannot use the 
returned reference to assign it. I suggest you add a new method:
	void setAttributeValue(unsigned i, const value_type & value) 
		value_type & attribute = 
			*(value_type *)_processingConfig->GetAttributeAsVoidPtr( i )
		attribute = value;
so you can call:
	config.setAttributeValue<std::string>(unsigned i, value) 




A Dijous 26 Maig 2011 20:36:41, Xavier Serra Román va escriure:
> Hi guys..
> I have another issue. How do you set new values to a dynamictype attribute?
> I've seen clam code such as:
> 	ConcreteString & value = *(ConcreteString
> *)object.GetAttributeAsVoidPtr(attribute); value =
> input->toPlainText().toLocal8Bit().constData();
> 
> but in my code I do:
> 	std::string old = config.attributeValue<std::string>(i);
> 	old = value;
> with value being passed as const std::string& and attributeValue<type>
> being: *(type *)_processingConfig->GetAttributeAsVoidPtr( i )
> and nothing changes. What am I doing wrong?
> 
> Thanks!
> 
> PS: I hate pointers
> 
> On May 25, 2011, at 8:39 PM, Pau Arumi wrote:
> > Check the Component interface. Maybe it is called Clone() or DeepCopy().
> > P
> > 
> > > On May 25, 2011, at 7:48 PM, David García Garzón wrote:
> > > > On Wednesday 25 May 2011 19:09:23 Xavier Serra Román wrote:
> > > > > Hi guys,
> > > > > I'm now at the part of ipyclam dealing with configurations and I've
> > > > > run into some trouble, I defined a c++ class to wrap into python
> > > > > with boost.python that holds a processingconfig.
> > > > > 
> > > > > I need to create the processingconfig in the class from a copy of
> > > > > another one so I've defined: ConfigurationProxy(const
> > > > > CLAM::ProcessingConfig & prototype)
> > > > > 
> > > > >     {
> > > > >     
> > > > >         _processingConfig = new CLAM::ProcessingConfig(prototype);
> > > > >     
> > > > >     }
> > > > > 
> > > > > this, obviously. doesn't work because abstract classes cannot be
> > > > > allocated but I don't know what else to do.
> > > > 
> > > > Use the Component::Species() virtual method. It is redefined in
> > > > subclasses  (including ProcessinConfig's derivatives) in a way that
> > > > it returns an object  of the same class than the receiver. Not a
> > > > copy, just the default constructed  one.
> > > 
> > > How do you call it? I don't seem to be able to make it work, I've tried
> > > from prototype.Species() to
> > > CLAM::ProcessingConfig::Species(prototype)..
> > > 
> > > > Be carefull on the code below, if you ned the default constructor (do
> > > > you need  it?) initialize all the members.
> > > > 
> > > > Be also carefull with the copy constructor (generated by default).
> > > > The default  copy constructor copies all members, in this case will
> > > > copy the pointer and  you will double delete it on the destructor.
> > > > This might happen not just in  assignments but also when passing it
> > > > as parameter or returning not as  reference,  and it may not be you
> > > > but maybe boost::python. So my suggestiong  is to implement it
> > > > private and assert false inside, so, at least if  boost::python uses
> > > > it you will be notified at compilation or runtime.
> > > > 
> > > > > The complete code of the class is:
> > > > > class ConfigurationProxy
> > > > > {
> > > > > 
> > > > > public:
> > > > >     CLAM::ProcessingConfig * _processingConfig;
> > > > >     ConfigurationProxy() {}
> > > > >     ConfigurationProxy(const CLAM::ProcessingConfig & prototype)
> > > > >     {
> > > > >     
> > > > >         _processingConfig = new CLAM::ProcessingConfig(prototype);
> > > > >     
> > > > >     }
> > > > >     ~ConfigurationProxy()
> > > > >     {
> > > > >     
> > > > >         delete _processingConfig;
> > > > >     
> > > > >     }
> > > > > 
> > > > > };
> > > > > 
> > > > > Thanks!
> > > > > _______________________________________________
> > > > > clam-devel mailing list
> > > > > clam-devel at lists.clam-project.org
> > > > > http://lists.clam-project.org/listinfo.cgi/clam-devel-clam-project.
> > > > > org
> > > 
> > > _______________________________________________
> > > clam-devel mailing list
> > > clam-devel at lists.clam-project.org
> > > http://lists.clam-project.org/listinfo.cgi/clam-devel-clam-project.org

-- 
David García Garzón
(Work) david dot garcia at upf anotherdot edu
http://www.iua.upf.edu/~dgarcia