Listing 6: Fragment from C++ header file qfloat.h

// Cephes Math Library Release 2.4: April, 1996
// Copyright 1996 by Stephen L. Mosier.
struct qfloatstruct
  {
    unsigned short ar[12];
  };
extern "C"
{
  void qclear (qfloatstruct *);
  void e24toq (const float *, qfloatstruct *);
  void etoq   (const double *, qfloatstruct *);
  void e64toq (const long double *, qfloatstruct *);
  void ltoq   (long int *, qfloatstruct *);
  void asctoq (const char *, qfloatstruct *);
}
class qfloat
{
  public:
  qfloatstruct a;
// ------------
// Constructor.
// ------------
  qfloat () {};
//  qfloat () {qclear(&a);};
// ----------------------------------------
// Conversions from base classes to qfloat.
// ----------------------------------------
  qfloat (float x)       {e24toq (&x, &a);}
  qfloat (double x)      {etoq (&x, &a);}
  qfloat (long double x) {e64toq (&x, &a);}
//  ------------------------------------------
//  qfloat (long double x) {e113toq (&x, &a);}    // 128-bit
//  ------------------------------------------
  qfloat (long int x) {ltoq (&x, &a);}
  qfloat (int x)      {long lx = x; ltoq (&lx, &a);}
// ----------------------------------------------
// For conversion and assignment x = "1.234e4321"
//  ----------------------------------------------
  qfloat (char *x) {asctoq (x, &a);}
// -------------------------------------------------------
// Type conversion to a base class is not possible in C++,
// so you have to use these functions instead, e.g.
//
//      int i = xtoi(q);
//
// to convert extended precision data to integer.
// -------------------------------------------------------
  friend int    xtoi (qfloat);
  friend long   xtol (qfloat);
  friend float  xtof (qfloat);
  friend double xtod (qfloat);
  friend long double xtold (qfloat);
};
/* End of File */