include/Geant4/G4IEEE754.hh

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
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0017 // *                                                                  *
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0024 // ********************************************************************
0025 //
0026 #ifndef G4IEEE754_hh
0027 #define G4IEEE754_hh 1
0028
0029 #include "G4Types.hh"
0030
0031 #include <cstdint>
0032
0033 namespace G4IEEE754
0034 {
0035 //----------------------------------------------------------------------------
0036 // Used to switch between different type of interpretations of the data
0037 // (64 bits)
0038 //
0039 union ieee754
0040 {
0041     ieee754() = default;
0042     ieee754(G4double thed) { d = thed; };
0043     ieee754(uint64_t thell) { ll = thell; };
0044     ieee754(G4float thef) { f[0] = thef; };
0045     ieee754(uint32_t thei) { i[0] = thei; };
0046     G4double d;
0047     G4float f[2];
0048     uint32_t i[2];
0049     uint64_t ll;
0050     uint16_t s[4];
0051 };
0052
0053 //----------------------------------------------------------------------------
0054 // Converts a double to an unsigned long long
0055 //
0056 inline uint64_t dp2uint64(G4double x)
0057 {
0058   ieee754 tmp;
0059   tmp.d = x;
0060   return tmp.ll;
0061 }
0062
0063 //----------------------------------------------------------------------------
0064 // Converts an unsigned long long to a double
0065 //
0066 inline G4double uint642dp(uint64_t ll)
0067 {
0068   ieee754 tmp;
0069   tmp.ll = ll;
0070   return tmp.d;
0071 }
0072
0073 //----------------------------------------------------------------------------
0074 // Converts an int to a float
0075 //
0076 inline G4float uint322sp(G4int x)
0077 {
0078   ieee754 tmp;
0079   tmp.i[0] = x;
0080   return tmp.f[0];
0081 }
0082
0083 //----------------------------------------------------------------------------
0084 // Converts a float to an int
0085 //
0086 inline uint32_t sp2uint32(G4float x)
0087 {
0088   ieee754 tmp;
0089   tmp.f[0] = x;
0090   return tmp.i[0];
0091 }
0092 }  // namespace G4IEEE754
0093
0094 #endif