include/Geant4/G4UniformRandPool.hh

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0025 //
0026 //
0027 //
0028 //
0029 // ------------------------------------------------------------
0030 //      GEANT 4 class header file
0031 // ------------------------------------------------------------
0032 // Class description:
0033 //
0034 // Class implementing a pool of random numbers filled according
0035 // to specified fixed size (default 1024).
0036
0037 // Author: A.Dotti (SLAC)
0038 // ------------------------------------------------------------
0039 #ifndef G4UNIFORMRANDPOOL_HH
0040 #define G4UNIFORMRANDPOOL_HH
0041
0042 #include "G4Types.hh"
0043 #include "Randomize.hh"
0044
0045 #include <algorithm>
0046 #include <cassert>
0047
0048 #define G4UNIFORMRANDPOOL_DEFAULT_POOLSIZE 1024
0049 #define G4UNIFORMRANDPOOL_TINY_POOLSIZE 128
0050 #define G4UNIFORMRANDPOOL_SMALL_POOLSIZE 256
0051 #define G4UNIFORMRANDPOOL_MEDIUM_POOLSIZE 512
0052 #define G4UNIFORMRANDPOOL_LARGE_POOLSIZE 2048
0053 #define G4UNIFORMRANDPOOL_HUGE_POOLSIZE 8192
0054
0055 class G4UniformRandPool
0056 {
0057  public:
0058   G4UniformRandPool();
0059   explicit G4UniformRandPool(G4int ps);
0060   ~G4UniformRandPool();
0061
0062   void Resize(G4int newSize);
0063   void GetMany(G4double* rnds, G4int howMany);
0064   inline G4double GetOne();
0065   inline G4int GetPoolSize() const;
0066
0067   // These two static methods are used to
0068   // simulate the calls of CLHEP::HepRandom
0069   //
0070   static G4double flat();
0071   static void flatArray(G4int howmany, G4double* rnds);
0072
0073  private:
0074   void Fill(G4int howmany);
0075
0076  private:
0077   G4int size{G4UNIFORMRANDPOOL_DEFAULT_POOLSIZE};
0078   G4double* buffer{nullptr};
0079   G4int currentIdx{0};
0080 };
0081
0082 inline G4double G4UniformRandPool::GetOne()
0083 {
0084   // No more available numbers, re-fill
0085   //
0086   if(currentIdx >= /*(unsigned int)*/ size)
0087   {
0088     Fill(/*(unsigned int)*/ size);
0089   }
0090
0091   return buffer[currentIdx++];
0092 }
0093
0094 inline G4int G4UniformRandPool::GetPoolSize() const
0095 {
0096   return size;
0097 }
0098
0099 #endif