interface/wx/math.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        math.h
   3 // Purpose:     interface of global functions
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /** @addtogroup group_funcmacro_math */
  10 //@{
  11
  12 /**
  13     Returns a non-zero value if @a x is neither infinite nor NaN (not a
  14     number), returns 0 otherwise.
  15
  16     @header{wx/math.h}
  17 */
  18 int wxFinite(double x);
  19
  20 /**
  21     Returns a non-zero value if x is NaN (not a number), returns 0 otherwise.
  22
  23     @header{wx/math.h}
  24 */
  25 bool wxIsNaN(double x);
  26
  27 /**
  28     Converts the given array of 10 bytes (corresponding to 80 bits) to
  29     a float number according to the IEEE floating point standard format
  30     (aka IEEE standard 754).
  31
  32     @see wxConvertToIeeeExtended() to perform the opposite operation
  33 */
  34 wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes);
  35
  36 /**
  37     Converts the given floating number @a num in a sequence of 10 bytes
  38     which are stored in the given array @a bytes (which must be large enough)
  39     according to the IEEE floating point standard format
  40     (aka IEEE standard 754).
  41
  42     @see wxConvertFromIeeeExtended() to perform the opposite operation
  43 */
  44 void wxConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes);
  45
  46 /**
  47     Small wrapper around round().
  48 */
  49 int wxRound(double x);
  50
  51 /**
  52    Returns true if both double values are identical. This is
  53    only reliable if both values have been assigned the same
  54    value.
  55 */
  56 bool wxIsSameDouble(double x, double y);
  57
  58 /**
  59    Return true of @a x is exactly zero. This is only reliable
  60    if it has been assigned 0.
  61 */
  62 bool wxIsNullDouble(double x);
  63
  64 //@}
  65