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NAME
     Tcl_NewDoubleObj, Tcl_SetDoubleObj,  Tcl_GetDoubleFromObj  -
     manipulate Tcl objects as floating-point values

SYNOPSIS
     #include <tcl.h>

     Tcl_Obj *
     Tcl_NewDoubleObj(doubleValue)

     Tcl_SetDoubleObj(objPtr, doubleValue)

     int
     Tcl_GetDoubleFromObj(interp, objPtr, doublePtr)

ARGUMENTS
     double       doubleValue   (in)      A      double-precision
                                          floating   point  value
                                          used to  initialize  or
                                          set a double object.

     Tcl_Obj      *objPtr       (in/out)  For   Tcl_SetDoubleObj,
                                          this   points   to  the
                                          object to be  converted
                                          to  double  type.   For
                                          Tcl_GetDoubleFromObj,
                                          this   refers   to  the
                                          object  from  which  to
                                          get  a double value; if
                                          objPtr does not already
                                          point   to   a   double
                                          object, an attempt will
                                          be  made  to convert it
                                          to one.

     Tcl_Interp   *interp       (in/out)  If an error occurs dur-
                                          ing    conversion,   an
                                          error message  is  left
                                          in   the  interpreter's
                                          result  object   unless
                                          interp is NULL.

     double       *doublePtr    (out)     Points  to   place   to
                                          store  the double value
                                          obtained from objPtr.
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DESCRIPTION

     These procedures are used to create, modify, and read double
     Tcl    objects    from   C   code.    Tcl_NewDoubleObj   and
     Tcl_SetDoubleObj will create a new object of double type  or
     modify an existing object to have double type. Both of these
     procedures set  the  object  to  have  the  double-precision
     floating  point value given by doubleValue; Tcl_NewDoubleObj
     returns a pointer to a newly created object  with  reference
     count  zero.   Both  procedures  set the object's type to be
     double and assign the double value to the object's  internal
     representation doubleValue member.  Tcl_SetDoubleObj invali-
     dates any old string representation and, if  the  object  is
     not   already  a  double  object,  frees  any  old  internal
     representation.

     Tcl_GetDoubleFromObj attempts to return a double value  from
     the  Tcl object objPtr.  If the object is not already a dou-
     ble object, it will attempt to convert it  to  one.   If  an
     error  occurs  during  conversion,  it returns TCL_ERROR and
     leaves an error message in the interpreter's  result  object
     unless  interp  is  NULL.   Otherwise, it returns TCL_OK and
     stores the double value in the address given  by  doublePtr.
     If the object is not already a double object, the conversion
     will free any old internal representation.


SEE ALSO
     Tcl_NewObj,       Tcl_DecrRefCount,        Tcl_IncrRefCount,
     Tcl_GetObjResult


KEYWORDS
     double, double object, double type, internal representation,
     object, object type, string representation

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