interface/wx/math.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        math.h
   3 // Purpose:     interface of global functions
   4 // Author:      wxWidgets team
   5 // Licence:     wxWindows licence
   6 /////////////////////////////////////////////////////////////////////////////
   7
   8 /** @addtogroup group_funcmacro_math */
   9 //@{
  10
  11 /**
  12     Returns a non-zero value if @a x is neither infinite nor NaN (not a
  13     number), returns 0 otherwise.
  14
  15     @header{wx/math.h}
  16 */
  17 int wxFinite(double x);
  18
  19 /**
  20     Returns a non-zero value if x is NaN (not a number), returns 0 otherwise.
  21
  22     @header{wx/math.h}
  23 */
  24 bool wxIsNaN(double x);
  25
  26 /**
  27     Converts the given array of 10 bytes (corresponding to 80 bits) to
  28     a float number according to the IEEE floating point standard format
  29     (aka IEEE standard 754).
  30
  31     @see wxConvertToIeeeExtended() to perform the opposite operation
  32 */
  33 wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes);
  34
  35 /**
  36     Converts the given floating number @a num in a sequence of 10 bytes
  37     which are stored in the given array @a bytes (which must be large enough)
  38     according to the IEEE floating point standard format
  39     (aka IEEE standard 754).
  40
  41     @see wxConvertFromIeeeExtended() to perform the opposite operation
  42 */
  43 void wxConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes);
  44
  45 /**
  46     Small wrapper around round().
  47 */
  48 int wxRound(double x);
  49
  50 /**
  51    Returns true if both double values are identical. This is
  52    only reliable if both values have been assigned the same
  53    value.
  54 */
  55 bool wxIsSameDouble(double x, double y);
  56
  57 /**
  58    Return true of @a x is exactly zero. This is only reliable
  59    if it has been assigned 0.
  60 */
  61 bool wxIsNullDouble(double x);
  62
  63 //@}
  64