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//
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// $Id: TAMBranchInfo.h 5120 2008-05-07 18:17:33Z loizides $
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//
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#ifndef ROOT_TAMBranchInfo
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#define ROOT_TAMBranchInfo
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#include <vector>
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using std::vector;
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#include <typeinfo>
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#ifndef ROOT_TNamed
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#include "TNamed.h"
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#endif
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#ifndef ROOT_TError
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#include "TError.h"
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#endif
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class TTree;
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class TAMVirtualBranchLoader;
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typedef void* BranchAddr_t;
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struct TAMBranchInfo : TNamed {
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// Stores the name and pointers to requested branches.
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// Inherits from TObject to allow storage in a THashTable
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struct BranchPtr_t {
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// In ROOT v4.0.8 (and prior) rootcint had trouble with a vector<void**>,
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// so instead we make a small struct to store the void** and use
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// a vector of the structs.
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//
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// Also serves as an abstract base class for the type-storing class
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// this allows the minimum number of functions & classes to be
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// templated.
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BranchAddr_t *fPtr; // pointer to the TAModule's pointer to the branch object
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BranchPtr_t(BranchAddr_t* ptr) : fPtr(ptr) {}
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virtual ~BranchPtr_t() { (*fPtr) = 0; }
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virtual const type_info& GetType() const=0;
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};
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template <typename T>
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struct TAMTypedBrPtr : BranchPtr_t {
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TAMTypedBrPtr(BranchAddr_t* ptr) : BranchPtr_t(ptr) {}
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virtual ~TAMTypedBrPtr() {}
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virtual const type_info& GetType() const { return typeid(T); }
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};
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Bool_t fIsLoaded; //=true if the branch is loaded for current event
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TAMVirtualBranchLoader *fLoader; //our data (tree) loader
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vector<BranchPtr_t*> fUsrAddresses; //list of pointers to each TAModule's pointer to branch object
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TAMBranchInfo(const Char_t* branchName=0);
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virtual ~TAMBranchInfo();
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template <typename T> Bool_t AddPtr(T*& address);
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Int_t GetEntry(Long64_t entry);
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TAMVirtualBranchLoader *GetLoader() const { return fLoader; }
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const type_info& GetType() const { return fUsrAddresses.empty() ?
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typeid(void) : fUsrAddresses[0]->GetType(); }
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void Init();
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Bool_t IsLoaded() const { return fIsLoaded; }
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using TObject::Notify;
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Bool_t Notify(TTree* tree);
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void SetUsrAddrs();
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void SetLoader(TAMVirtualBranchLoader *loader) { fLoader = loader; }
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void ZeroUsrAddrs();
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ClassDef(TAMBranchInfo,0) // General per branch information
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};
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//______________________________________________________________________________
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template <typename T>
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inline Bool_t TAMBranchInfo::AddPtr(T*& address)
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{
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// Add a user pointer for this branch.
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// Must do an explicit cast to BranchAddr_t*
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BranchAddr_t* adr = reinterpret_cast<BranchAddr_t*>(&address);
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fUsrAddresses.push_back(new TAMTypedBrPtr<T>(adr));
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return kTRUE;
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}
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#endif //ROOT_TAMBranchInfo
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