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OpenDarwin 7.2.1 - man page for tcl_getdoublefromobj (opendarwin section 3)

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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  ini-
					    tialize 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 during conversion, an error mes-
					    sage 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.

       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 represen-
       tation doubleValue member.  Tcl_SetDoubleObj invalidates  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 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 inter-
       preter'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

Tcl					       8.0				 Tcl_DoubleObj(3)
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