//
// ********************************************************************
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//
#ifndef G4IEEE754_hh
#define G4IEEE754_hh 1

#include "G4Types.hh"

#include <cstdint>

namespace G4IEEE754
{
//----------------------------------------------------------------------------
// Used to switch between different type of interpretations of the data
// (64 bits)
//
union ieee754
{
    ieee754() = default;
    ieee754(G4double thed) { d = thed; };
    ieee754(uint64_t thell) { ll = thell; };
    ieee754(G4float thef) { f[0] = thef; };
    ieee754(uint32_t thei) { i[0] = thei; };
    G4double d;
    G4float f[2];
    uint32_t i[2];
    uint64_t ll;
    uint16_t s[4];
};

//----------------------------------------------------------------------------
// Converts a double to an unsigned long long
//
inline uint64_t dp2uint64(G4double x)
{
  ieee754 tmp;
  tmp.d = x;
  return tmp.ll;
}

//----------------------------------------------------------------------------
// Converts an unsigned long long to a double
//
inline G4double uint642dp(uint64_t ll)
{
  ieee754 tmp;
  tmp.ll = ll;
  return tmp.d;
}

//----------------------------------------------------------------------------
// Converts an int to a float
//
inline G4float uint322sp(G4int x)
{
  ieee754 tmp;
  tmp.i[0] = x;
  return tmp.f[0];
}

//----------------------------------------------------------------------------
// Converts a float to an int
//
inline uint32_t sp2uint32(G4float x)
{
  ieee754 tmp;
  tmp.f[0] = x;
  return tmp.i[0];
}
}  // namespace G4IEEE754

#endif