BABAR C++ Course Running the Examples - HEPHY

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ClassesExamples from CLHEPB&N: “Scientific and engineering problems arerarely posed directly in terms of the computer’sintrinsic types: bits, bytes, integers and floatingpoint numbers”Shocking statement?In a detector’s tracking code, for example, theproblem is posed in terms of…• tracks• points• list of points• chamber• cylinders• layersC++ with its mechanism of classes allows definingnew types and the operations on these typesWhen we do object-oriented programming with C++we will be writing and using classesClass Library for High Energy PhysicsWhy?• Provide some classes are specific to HEP• Encourage code sharing between experiments andbetween experimentalists and theorists.• Reduce redundant workWho?• Leif Lönnblad, NBI (via CERN, DESY and Lund)• Paul Rensing, CERN (via SLAC)• Anders Nilsson (Lund), Dag Brück (LIT), and othersUse• examples of use at/usr/local/doc/programming/C++class/SciEng/examples/clhep• header files: /usr/local/lib/include/CLHEP• library file for gcc: /usr/local/lib/libCLHEP.aBABAR C++ Course 66 Paul F. KunzBABAR C++ Course 67 Paul F. Kunz
ThreeVectorUsing a class objectCLHEP’s ThreeVector class (simplified)class Hep3VectorF {public:Hep3VectorF();Hep3VectorF(float x, float y, float z);Hep3VectorF(const Hep3VectorF &v);float x();float y();float z();float phi();float cosTheta();float mag();// much more not shownprivate:float fx, fy, fz;};• this is the header file• keyword class starts the declaration which iscontained within the {}• sort of like the function prototypes• an object of a class contains data• an object of a class has certain functions associatedwith itConsider (clhep/threeVector0.C)#include #include int main() {float x, y, z;while ( cin >> x >> y >> z ) {Hep3VectorF aVec(x, y, z);cout
Page 1 and 2: BABAR C++ CourseRunning the Example
Page 3 and 4: C++ Input and OutputMore on I/OIntr
Page 5 and 6: Declaring types and initializingTyp
Page 7 and 8: Relational OperatorsLogical operato
Page 9 and 10: Assignment operatorsOperator Preced
Page 11 and 12: Coding Styleswhile loopC/C++ is fre
Page 13 and 14: do-while Examplefor loopSnippet fro
Page 15 and 16: ArraysExample Code and a TestA coll
Page 17 and 18: Plan of the dayFunctionsFunctionsPo
Page 19 and 20: Header files used with definitionHe
Page 21 and 22: Functions in CHeader FilesFunction
Page 23 and 24: Pointers and ArraysPointer Arithmet
Page 25 and 26: Progression towards C++ styleExampl
Page 27 and 28: Line fit continuedCharacter Strings
Page 29 and 30: Formal ArgumentsReferencesConsider(
Page 31 and 32: More on declarationsconst PointerWe
Page 33: Inline FunctionsSummarySometimes, t
Page 37 and 38: Use of private keywordInitializing
Page 39 and 40: Access member functionsInline acces
Page 41 and 42: C++ designHomeworkC++ style• effi
Page 43 and 44: Member InitializersFunction Return
Page 45 and 46: Operator Function ImplementationCom
Page 47 and 48: Need Symmetric Operator FunctionsTh
Page 49 and 50: SummaryLevels of Abstraction in Phy
Page 51 and 52: Plan of the daySimpleFloatArray Cla
Page 53 and 54: Constructor Implementationscopy Imp
Page 55 and 56: operator= Member FunctionAssignment
Page 57 and 58: Key pointsClass explosion?• shoul
Page 59 and 60: Function TemplatesList or Array?Rem
Page 61 and 62: The Node and List classesProblemsDe
Page 63 and 64: IteratorsIterators++CompareSimpleAr
Page 65 and 66: Standard Template Library (STL)Feat
Page 67 and 68: Recall our test programPossible 4-V
Page 69 and 70: Use of Lorentz VectorMemory modelCo
Page 71 and 72: Even more of ImplementationWhat’s
Page 73 and 74: Class HierarchyObject HierarchyIn c
Page 75 and 76: Class hierarchyLockable classFor bo
Page 77 and 78: The classes involvedmain.ccFrom CLH
Page 79 and 80: Do particle type identificationIden
Page 81 and 82: Finally, find all B 0 -> D * D *Sum
Page 83 and 84: Particle Data Table classLayoutHist
Page 85 and 86:
PDTEntry classDecayMode classParts
Page 87 and 88:
Gismo HistorySome Gismo ClassesVers
Page 89 and 90:
Surface classPlane classPart of the
Page 91 and 92:
Gismo VolumePart of implementationP
Page 93 and 94:
Back to implementationFollowing the
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As expectedVirtual destructorIn Cir
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BABAR C++ Course Running the Examples - HEPHY

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