include/Geant4/G4FastVector.hh

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0025 //
0026 // G4FastVector
0027 //
0028 // Class description:
0029 //
0030 // Template class defining a vector of pointers,
0031 // not performing boundary checking.
0032
0033 // Author: G.Cosmo, 2 December 1995
0034 //         First implementation, based on object model
0035 // --------------------------------------------------------------------
0036 #ifndef G4FastVector_hh
0037 #define G4FastVector_hh 1
0038
0039 #include "globals.hh"
0040
0041 template <class Type, G4int N>
0042 class G4FastVector
0043 {
0044  public:
0045   G4FastVector() { ptr = &theArray[0]; }
0046
0047   ~G4FastVector()
0048   {
0049     if(ptr != &theArray[0])
0050       delete[] ptr;
0051   }
0052
0053   inline Type* operator[](G4int anIndex) const
0054   //  Access operator to the array.
0055   {
0056     return ptr[anIndex];
0057   }
0058
0059   inline void Initialize(G4int items)
0060   //  Normally the pointer ptr points to the stack-array
0061   //  theArray; only when the number of items is greater
0062   //  than N, memory is allocated dynamically.
0063   {
0064     if(ptr != &theArray[0])
0065       delete[] ptr;
0066     if(items > N)
0067       ptr = new Type*[items];
0068     else
0069       ptr = &theArray[0];
0070   }
0071
0072   inline void SetElement(G4int anIndex, Type* anElement)
0073   //  To insert an element at the given position inside
0074   //  the vector.
0075   {
0076     ptr[anIndex] = anElement;
0077   }
0078
0079  private:
0080   Type* theArray[N];
0081   Type** ptr;
0082 };
0083
0084 #endif