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Tcl_DoubleObj(3)	    Tcl Library Procedures	      Tcl_DoubleObj(3)

______________________________________________________________________________

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_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.
_________________________________________________________________

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-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-
       tation.

       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.

SEE ALSO
       Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult

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

Tcl				      8.0		      Tcl_DoubleObj(3)
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