library: libCore
#include "TStreamerInfo.h" |
TStreamerInfo
class description - source file - inheritance tree (.pdf)
private:
void BuildUserInfo(const char* info)
static Double_t GetValueAux(Int_t type, void* ladd, int k, Int_t len)
static void PrintValueAux(char* ladd, Int_t atype, TStreamerElement* aElement, Int_t aleng, Int_t* count)
public:
TStreamerInfo()
TStreamerInfo(TClass* cl, const char* info)
TStreamerInfo(const TStreamerInfo&)
virtual ~TStreamerInfo()
void Build()
void BuildCheck()
void BuildEmulated(TFile* file)
void BuildOld()
static Bool_t CanDelete()
static Bool_t CanOptimize()
static TClass* Class()
void Compile()
void ComputeSize()
void ForceWriteInfo(TFile* file, Bool_t force = kFALSE)
Int_t GenerateHeaderFile(const char* dirname)
UInt_t GetCheckSum() const
TClass* GetClass() const
Int_t GetClassVersion() const
static TStreamerElement* GetCurrentElement()
Int_t GetDataMemberOffset(TDataMember* dm, TMemberStreamer*& streamer) const
static TStreamerBasicType* GetElementCounter(const char* countName, TClass* cl)
TObjArray* GetElements() const
ULong_t* GetElems() const
Int_t* GetLengths() const
ULong_t* GetMethods() const
Int_t GetNdata() const
Int_t* GetNewTypes() const
Int_t GetNumber() const
Int_t GetOffset(const char*) const
Int_t* GetOffsets() const
Version_t GetOldVersion() const
Int_t GetSize() const
Int_t GetSizeElements() const
TStreamerElement* GetStreamerElement(const char* datamember, Int_t& offset) const
TStreamerElement* GetStreamerElementReal(Int_t i, Int_t j) const
static Bool_t GetStreamMemberWise()
Int_t* GetTypes() const
Double_t GetValue(char* pointer, Int_t i, Int_t j, Int_t len) const
Double_t GetValueClones(TClonesArray* clones, Int_t i, Int_t j, Int_t k, Int_t eoffset) const
Double_t GetValueSTL(TVirtualCollectionProxy* cont, Int_t i, Int_t j, Int_t k, Int_t eoffset) const
virtual TClass* IsA() const
Bool_t IsBuilt() const
Bool_t IsOptimized() const
Int_t IsRecovered() const
virtual void ls(Option_t* option = "") const
Int_t New(const char* p)
TStreamerInfo& operator=(const TStreamerInfo&)
static void Optimize(Bool_t opt = kTRUE)
void PrintValue(const char* name, char* pointer, Int_t i, Int_t len, Int_t lenmax = 1000) const
void PrintValueClones(const char* name, TClonesArray* clones, Int_t i, Int_t eoffset, Int_t lenmax = 1000) const
void PrintValueSTL(const char* name, TVirtualCollectionProxy* cont, Int_t i, Int_t eoffset, Int_t lenmax = 1000) const
Int_t ReadBufferClones(TBuffer& b, TClonesArray* clones, Int_t nc, Int_t first, Int_t eoffset)
Int_t ReadBufferSTL(TBuffer& b, TVirtualCollectionProxy* cont, Int_t nc, Int_t first, Int_t eoffset)
static void SetCanDelete(Bool_t opt = kTRUE)
void SetCheckSum(UInt_t checksum)
void SetClass(TClass* cl)
void SetClassVersion(Int_t vers)
static Bool_t SetStreamMemberWise(Bool_t enable = kTRUE)
virtual void ShowMembers(TMemberInspector& insp, char* parent)
virtual void Streamer(TBuffer& b)
void StreamerNVirtual(TBuffer& b)
void TagFile(TFile* fFile)
virtual void Update(const TClass* oldClass, TClass* newClass)
Int_t WriteBuffer(TBuffer& b, char* pointer, Int_t first)
Int_t WriteBufferClones(TBuffer& b, TClonesArray* clones, Int_t nc, Int_t first, Int_t eoffset)
Int_t WriteBufferSTL(TBuffer& b, TVirtualCollectionProxy* cont, Int_t nc, Int_t first, Int_t eoffset)
private:
UInt_t fCheckSum checksum of original class
Int_t fClassVersion Class version identifier
Int_t fNumber !Unique identifier
Int_t fNdata !number of optmized types
Int_t fSize !size of the persistent class
Int_t* fType ![fNdata]
Int_t* fNewType ![fNdata]
Int_t* fOffset ![fNdata]
Int_t* fLength ![fNdata]
ULong_t* fElem ![fNdata]
ULong_t* fMethod ![fNdata]
TStreamerInfo::CompInfo* fComp ![fNdata] additional info
Bool_t fOptimized ! true if has been optimized
TClass* fClass !pointer to class
TObjArray* fElements Array of TStreamerElements
Version_t fOldVersion ! Version of the TStreamerInfo object read from the file
Bool_t fIsBuilt ! true if the TStreamerInfo has been 'built'
static Int_t fgCount Number of TStreamerInfo instances
static Bool_t fgCanDelete True if ReadBuffer can delete object
static Bool_t fgOptimize True if optimization on
static Bool_t fgStreamMemberWise True if the collections are to be stream "member-wise" (when possible).
static TStreamerElement* fgElement Pointer to current TStreamerElement
public:
static const enum TStreamerInfo:: kCannotOptimize
static const enum TStreamerInfo:: kRecovered
static const TStreamerInfo::EReadWrite kBase
static const TStreamerInfo::EReadWrite kOffsetL
static const TStreamerInfo::EReadWrite kOffsetP
static const TStreamerInfo::EReadWrite kCounter
static const TStreamerInfo::EReadWrite kCharStar
static const TStreamerInfo::EReadWrite kChar
static const TStreamerInfo::EReadWrite kShort
static const TStreamerInfo::EReadWrite kInt
static const TStreamerInfo::EReadWrite kLong
static const TStreamerInfo::EReadWrite kFloat
static const TStreamerInfo::EReadWrite kDouble
static const TStreamerInfo::EReadWrite kDouble32
static const TStreamerInfo::EReadWrite kUChar
static const TStreamerInfo::EReadWrite kUShort
static const TStreamerInfo::EReadWrite kUInt
static const TStreamerInfo::EReadWrite kULong
static const TStreamerInfo::EReadWrite kBits
static const TStreamerInfo::EReadWrite kLong64
static const TStreamerInfo::EReadWrite kULong64
static const TStreamerInfo::EReadWrite kBool
static const TStreamerInfo::EReadWrite kObject
static const TStreamerInfo::EReadWrite kAny
static const TStreamerInfo::EReadWrite kObjectp
static const TStreamerInfo::EReadWrite kObjectP
static const TStreamerInfo::EReadWrite kTString
static const TStreamerInfo::EReadWrite kTObject
static const TStreamerInfo::EReadWrite kTNamed
static const TStreamerInfo::EReadWrite kAnyp
static const TStreamerInfo::EReadWrite kAnyP
static const TStreamerInfo::EReadWrite kAnyPnoVT
static const TStreamerInfo::EReadWrite kSTLp
static const TStreamerInfo::EReadWrite kSkip
static const TStreamerInfo::EReadWrite kSkipL
static const TStreamerInfo::EReadWrite kSkipP
static const TStreamerInfo::EReadWrite kConv
static const TStreamerInfo::EReadWrite kConvL
static const TStreamerInfo::EReadWrite kConvP
static const TStreamerInfo::EReadWrite kSTL
static const TStreamerInfo::EReadWrite kSTLstring
static const TStreamerInfo::EReadWrite kStreamer
static const TStreamerInfo::EReadWrite kStreamLoop
static const TStreamerInfo::EReadWrite kMissing
TStreamerInfo()
Default ctor.
TStreamerInfo(TClass *cl, const char *info)
: TNamed(cl->GetName(),info)
Create a TStreamerInfo object.
~TStreamerInfo()
TStreamerInfo dtor.
void Build()
Build the I/O data structure for the current class version
A list of TStreamerElement derived classes is built by scanning
one by one the list of data members of the analyzed class.
void BuildCheck()
check if the TStreamerInfo structure is already created
called by TFile::ReadStreamerInfo
void BuildEmulated(TFile *file)
Create an Emulation TStreamerInfo object.
void BuildOld()
rebuild the TStreamerInfo structure
void BuildUserInfo(const char * /*info*/)
Build the I/O data structure for the current class version
Bool_t CanDelete()
static function returning true if ReadBuffer can delete object
Bool_t CanOptimize()
static function returning true if optimization can be on
void Compile()
loop on the TStreamerElement list
regroup members with same type
Store predigested information into local arrays. This saves a huge amount
of time compared to an explicit iteration on all elements.
void ComputeSize()
Compute total size of all persistent elements of the class
void ForceWriteInfo(TFile *file, Bool_t force)
will force this TStreamerInfo to the file and also
all the dependencies.
This function is called when streaming a class that contains
a null pointer. In this case, the TStreamerInfo for the class
with the null pointer must be written to the file and also all the
TStreamerInfo of all the classes referenced by the class.
if argument force > 0 the loop on class dependencies is forced
Int_t GenerateHeaderFile(const char *dirname)
Generate header file for the class described by this TStreamerInfo
the function is called by TFile::MakeProject for each class in the file
TStreamerElement* GetCurrentElement()
static function returning a pointer to the current TStreamerElement
fgElement points to the current TStreamerElement being read in ReadBuffer
Int_t GetDataMemberOffset(TDataMember *dm, TMemberStreamer *&streamer) const
Compute data member offset
return pointer to the Streamer function if one exists
TStreamerBasicType* GetElementCounter(const char *countName, TClass *cl)
Get pointer to a TStreamerBasicType in TClass *cl
static function
Int_t GetOffset(const char *elementName) const
return the offset of the data member as indicated by this StreamerInfo
Int_t GetSize() const
return total size of all persistent elements of the class (with offsets)
Int_t GetSizeElements() const
return total size of all persistent elements of the class
use GetSize if you want to get the real size in memory
TStreamerElement* GetStreamerElement(const char* datamember, Int_t &offset) const
Return the StreamerElement of "datamember" inside this class of any of its
base class. The offset information contained in the StreamerElement is related
to its immediate containing class, so we return in 'offset' the offset inside
the class of this streamerInfo.
TStreamerElement* GetStreamerElementReal(Int_t i, Int_t j) const
TStreamerInfo holds two types of data structures
-TObjArray* fElements; containing the list of all TStreamerElement
objects for this class version.
-ULong_t* fElem; containing the preprocessed information
by TStreamerInfo::Compile In case consecutive data members
are of the same type, the Compile function declares the consecutive
elements as one single element in fElems.
example with the class TAttLine
gROOT->GetClass("TAttLine")->GetStreamerInfo()->ls(); produces;
StreamerInfo for class: TAttLine, version=1
short fLineColor offset= 4 type= 2 line color
short fLineStyle offset= 6 type= 2 line style
short fLineWidth offset= 8 type= 2 line width
i= 0, fLineColor type= 22, offset= 4, len=3, method=0
For I/O implementations (eg. XML) , one has to know the original name
of the data member. This function can be used to return a pointer
to the original TStreamerElement object corresponding to the j-th
element of a compressed array in fElems.
parameters description:
- i: the serial number in array fElem
- j: the element number in the array of consecutive types
In the above example the class TAttLine has 3 consecutive data members
of the same type "short". Compile makes one single array of 3 elements.
To access the TStreamerElement for the second element
of this array, one can call:
TStreamerElement *el = GetStreamerElementReal(0,1);
const char* membername = el->GetName();
This function is typically called from Tbuffer, TXmlBuffer
Bool_t GetStreamMemberWise()
Return whether the TStreamerInfos will save the collections in
"member-wise" order whenever possible. The default is to store member-wise.
kTRUE indicates member-wise storing
kFALSE inddicates object-wise storing
A collection can be saved member wise when it contain is guaranteed to be
homogeneous. For example std::vector<THit> can be stored member wise,
while std::vector<THit*> can not (possible use of polymorphism).
Double_t GetValueAux(Int_t type, void *ladd, Int_t k, Int_t len)
Double_t GetValue(char *pointer, Int_t i, Int_t j, Int_t len) const
return value of element i in object at pointer.
The function may be called in two ways:
-method1 len < 0
i is assumed to be the TStreamerElement number i in StreamerInfo
-method2 len >= 0
i is the type
address of variable is directly pointer.
Double_t GetValueClones(TClonesArray *clones, Int_t i, Int_t j, int k, Int_t eoffset) const
return value of element i in object number j in a TClonesArray and eventually
element k in a sub-array.
Double_t GetValueSTL(TVirtualCollectionProxy *cont, Int_t i, Int_t j, int k, Int_t eoffset) const
return value of element i in object number j in a TClonesArray and eventually
element k in a sub-array.
void ls(Option_t *option) const
List the TStreamerElement list and also the precomputed tables
Int_t New(const char *p)
emulated constructor for this class.
An emulated object is created at address p
void Optimize(Bool_t opt)
This is a static function.
Set optimization option.
When this option is activated (default), consecutive data members
of the same type are merged into an array (faster).
Optimization must be off in TTree split mode.
void PrintValue(const char *name, char *pointer, Int_t i, Int_t len, Int_t lenmax) const
print value of element i in object at pointer
The function may be called in two ways:
-method1 len < 0
i is assumed to be the TStreamerElement number i in StreamerInfo
-method2 len >= 0
i is the type
address of variable is directly pointer.
len is the number of elements to be printed starting at pointer.
void PrintValueClones(const char *name, TClonesArray *clones, Int_t i, Int_t eoffset, Int_t lenmax) const
print value of element i in a TClonesArray
void PrintValueSTL(const char *name, TVirtualCollectionProxy *cont, Int_t i, Int_t eoffset, Int_t lenmax) const
print value of element i in a TClonesArray
void SetCanDelete(Bool_t opt)
This is a static function.
Set object delete option.
When this option is activated (default), ReadBuffer automatically
delete objects when a data member is a pointer to an object.
If your constructor is not presetting pointers to 0, you must
call this static function TStreamerInfo::SetCanDelete(kFALSE);
Bool_t SetStreamMemberWise(Bool_t enable)
Set whether the TStreamerInfos will save the collections in
"member-wise" order whenever possible. The default is to store member-wise.
kTRUE indicates member-wise storing
kFALSE inddicates object-wise storing
This function returns the previous value of fgStreamMemberWise.
void Streamer(TBuffer &R__b)
Stream an object of class TStreamerInfo.
void TagFile(TFile *file)
Mark the classindex of the current file as using this TStreamerInfo
void PrintValueAux(char *ladd, Int_t atype,
TStreamerElement * aElement, Int_t aleng,
Int_t *count)
print value of element in object at pointer, type atype, leng aleng or *count
The function may be called in two ways:
-method1 len < 0
i is assumed to be the TStreamerElement number i in StreamerInfo
-method2 len >= 0
i is the type
address of variable is directly pointer.
len is the number of elements to be printed starting at pointer.
void Update(const TClass *oldcl, TClass *newcl)
function called by the TClass constructor when replacing an emulated class
by the real class
Inline Functions
TClass* GetClass() const
UInt_t GetCheckSum() const
Int_t GetClassVersion() const
TObjArray* GetElements() const
ULong_t* GetElems() const
Int_t GetNdata() const
Int_t GetNumber() const
Int_t* GetLengths() const
ULong_t* GetMethods() const
Int_t* GetNewTypes() const
Int_t* GetOffsets() const
Version_t GetOldVersion() const
Int_t* GetTypes() const
Bool_t IsBuilt() const
Bool_t IsOptimized() const
Int_t IsRecovered() const
Int_t ReadBufferClones(TBuffer& b, TClonesArray* clones, Int_t nc, Int_t first, Int_t eoffset)
Int_t ReadBufferSTL(TBuffer& b, TVirtualCollectionProxy* cont, Int_t nc, Int_t first, Int_t eoffset)
void SetCheckSum(UInt_t checksum)
void SetClass(TClass* cl)
void SetClassVersion(Int_t vers)
Int_t WriteBuffer(TBuffer& b, char* pointer, Int_t first)
Int_t WriteBufferClones(TBuffer& b, TClonesArray* clones, Int_t nc, Int_t first, Int_t eoffset)
Int_t WriteBufferSTL(TBuffer& b, TVirtualCollectionProxy* cont, Int_t nc, Int_t first, Int_t eoffset)
TClass* Class()
TClass* IsA() const
void ShowMembers(TMemberInspector& insp, char* parent)
void StreamerNVirtual(TBuffer& b)
TStreamerInfo TStreamerInfo(const TStreamerInfo&)
TStreamerInfo& operator=(const TStreamerInfo&)
Author: Rene Brun 12/10/2000
Last update: root/meta:$Name: $:$Id: TStreamerInfo.cxx,v 1.227 2005/09/03 00:48:25 pcanal Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
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