You may provide a custom Registry::Streamer method for you class
That defines how to stream you objects from your container into ROOT buffer and how to recreate
your container back.
You can use
http://root.cern.ch/root/htmldoc/src/TCollection.cxx.html#TCollection:Streamer
as example.
Hope this helps.
Valery
----- Original Message -----
From: Brett Viren <bv@bnl.gov>
To: <roottalk@pcroot.cern.ch>
Sent: 13 октября 2000 г. 13:14
Subject: [ROOT] Sending mixed templated/non-templated objects through ROOT I/O
> Hi.
>
> I have a heterogeneous container which maps (using an STL map) STL
> strings to arbitrarily typed values. I want to be able to send this
> container through ROOT I/O. I have learned how to send simple
> templated objects through ROOT I/O, but I can't seem to figure out how
> to do it in the case of my container.
>
> This container is implimented in 3 classes. The container is called
> Registry and it holds values of type (pointer to) RegistryItem. Each
> type T of value is stored in a templated subclass of RegistryItem
> called RegistryItemXxx<T>. These are outlined below:
>
> // The container
> class Registry
> {
> public:
> // non-templated ctor/dtor
>
> // templated accessors
> template<class T> T GetVal(string key);
> template<class T> void SetVal(string key, T value);
> private:
> map<string, RegistryItem*> fMap;
> };
>
>
> // The generic class which the container holds
> class RegistryItem
> {
> public:
> // non-templated ctor/dtor
> // that's it
> };
>
> // The templated class holding a specific typed value
> template<class T>
> class RegistryItemXxx : public RegistryItem
> {
> public:
> // templated ctor/dtor
>
> // templated accessors
> T* Get(void);
> void Set(T* data);
> private:
> T* fData;
> };
>
>
> The Registry::GetVal() method uses dynamic_cast<RegistryItemXxx<T>*>()
> to turn a generic RegistryItem into the correctly typed version. This
> provides type safe access.
>
>
> Can any one give me some guidance on how to proceed to get this
> container to go through ROOT I/O ?
>
> Thanks,
> -Brett.
>
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