Tcl_GetDoubleFromObj man page on QNX

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Tcl_DoubleObj(3)	    Tcl Library Procedures	      Tcl_DoubleObj(3)


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

       #include <tcl.h>

       Tcl_Obj *

       Tcl_SetDoubleObj(objPtr, doubleValue)

       Tcl_GetDoubleFromObj(interp, objPtr, doublePtr)

       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_GetDouble‐
					    FromObj, 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 during conver‐
					    sion, an error message is left  in
					    the	 interpreter's	result	object
					    unless interp is NULL.

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

       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-pre‐
       cision  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 dou‐
       ble value to the object's internal representation  doubleValue  member.
       Tcl_SetDoubleObj	 invalidates any old string representation and, if the
       object is not already a double object, frees any old internal represen‐

       Tcl_GetDoubleFromObj  attempts  to  return  a double value from the Tcl
       object objPtr.  If the object is not already a double 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.

       Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult

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

Tcl				      8.0		      Tcl_DoubleObj(3)
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