include/Geant4/G4VDNAMesh.hh

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
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0024 // ********************************************************************
0025 //
0026 //
0027 #ifndef G4VDNAMesh_hh
0028 #define G4VDNAMesh_hh 1
0029
0030 #include "globals.hh"
0031
0032 class G4VDNAMesh
0033 {
0034  public:
0035   G4VDNAMesh()          = default;
0036   virtual ~G4VDNAMesh() = default;
0037   struct Index
0038   {
0039     Index() = default;
0040     Index(G4int _x, G4int _y, G4int _z)
0041       : x(_x)
0042         , y(_y)
0043         , z(_z)
0044     {}
0045     ~Index() = default;
0046     G4bool operator==(const Index& rhs) const
0047     {
0048       return x == rhs.x && y == rhs.y && z == rhs.z;
0049     }
0050     G4bool operator!=(const Index& rhs) const
0051     {
0052       return x != rhs.x || y != rhs.y || z != rhs.z;
0053     }
0054     G4bool operator<(const Index& rhs) const
0055     {
0056       if(x != rhs.x)
0057       {
0058         return x < rhs.x;
0059       }
0060       if(y != rhs.y)
0061       {
0062         return y < rhs.y;
0063       }
0064       if(z != rhs.z)
0065       {
0066         return z < rhs.z;
0067       }
0068
0069       return false;
0070     }
0071     friend std::ostream& operator<<(std::ostream& s, const Index& rhs);
0072     G4int x = 0;
0073     G4int y = 0;
0074     G4int z = 0;
0075   };
0076   struct hashFunc
0077   {
0078       size_t operator()(const Index& k) const
0079       {
0080         size_t h1 = std::hash<G4int>()(k.x);
0081         size_t h2 = std::hash<G4int>()(k.y);
0082         size_t h3 = std::hash<G4int>()(k.z);
0083
0084         // Combine the hashes using a consistent and well-distributed technique
0085         size_t seed = 0;
0086         seed ^= h1 + 0x9e3779b9 + (seed << 6) + (seed >> 2);
0087         seed ^= h2 + 0x9e3779b9 + (seed << 6) + (seed >> 2);
0088         seed ^= h3 + 0x9e3779b9 + (seed << 6) + (seed >> 2);
0089
0090         return seed;
0091       }
0092   };
0093 };
0094 #endif