[clam-devel] ipyclam: trouble with ProcessingConfigs

[Xavier Serra Román]

On May 26, 2011, at 10:15 PM, Pau Arumi wrote:
> I thing you are missing the & in "string & old = ..." 
> however i might not be understanding completely the situation. 
> P 
> 
I already tried it and it forces me to put "constant" if I put the "&". If i put
the constant obviously then I can't change the value which is what I want.

Generally speaking, what I am trying to do is modify the value of an attribute
in a DynamicType and I try to do it by getting an attribute from a DynamicType
as void*, casting it to std::string and changing the value

> -- 
> Sent on the road 
> 
> ----- Mensaje original ----- 
> > 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 
> > -- 
> > Sent on the road 
> > 
> > ----- Mensaje original ----- 
> > > 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<mailto: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<mailto:clam-devel at lists.clam-project.org> 
> > > http://lists.clam-project.org/listinfo.cgi/clam-devel-clam-project.org 
> > 
> > 
> 
> <Archivo adjunto>  ATT00001.txt 
> 
> 

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