G4FastVector.hh

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00025 //
00026 //
00027 // $Id$
00028 //
00029 // 
00030 // ------------------------------------------------------------
00031 //      GEANT 4 class header file 
00032 //
00033 //      History: first implementation, based on object model of
00034 //      2nd December 1995, G.Cosmo
00035 // ------------------------------------------------------------
00036 
00037 #ifndef G4FastVector_h
00038 #define G4FastVector_h 1
00039 
00040 #include "globals.hh"
00041 
00042 template <class Type, G4int N>
00043 class G4FastVector 
00044 {
00045   //  Template class defining a vector of pointers,
00046   //  not performing boundary checking.
00047 
00048   public:
00049 
00050       G4FastVector() { ptr = &theArray[0]; }
00051 
00052       ~G4FastVector()
00053       {
00054         if (ptr != &theArray[0]) delete [] ptr;
00055       }
00056 
00057       inline Type* operator[](G4int anIndex) const
00058       //  Access operator to the array.
00059       {
00060         return ptr[anIndex];
00061       }
00062 
00063       void Initialize(G4int items)
00064       //  Normally the pointer ptr points to the stack-array
00065       //  theArray; only when the number of items is greater
00066       //  than N, memory is allocated dynamically.
00067       {
00068         if (ptr != &theArray[0])
00069            delete [] ptr;
00070         if (items > N)
00071            ptr = new Type*[items];
00072         else
00073            ptr = &theArray[0];
00074       } 
00075 
00076       inline void SetElement(G4int anIndex, Type *anElement)
00077       //  To insert an element at the given position inside
00078       //  the vector.
00079       {
00080         ptr[anIndex] = anElement;
00081       }
00082 
00083   private:
00084 
00085       Type *theArray[N];
00086       Type **ptr;
00087 };
00088 
00089 #endif
00090 

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