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_GetDoubleFro-
					    mObj, 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 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.
_________________________________________________________________

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 invalidates any old string representation and, if the object is not already a double object, frees any old inter-
       nal 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  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)