centos man page for tcl_newdoubleobj

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 Tcl object.

       Tcl_Obj *objPtr (in/out) 	    For  Tcl_SetDoubleObj, this points to the object in which to store a double value.	For Tcl_GetDouble-
					    FromObj, this refers to the object from which to retrieve a double value.

       Tcl_Interp *interp (in/out)	    When non-NULL, an error message is left here when double value retrieval fails.

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

DESCRIPTION
       These procedures are used to create, modify, and read Tcl objects that hold double-precision floating-point values.

       Tcl_NewDoubleObj creates and returns a new Tcl object initialized to the double value doubleValue.  The returned Tcl object is unshared.

       Tcl_SetDoubleObj sets the value of an existing Tcl object pointed to by objPtr to the double value doubleValue.	The objPtr  argument  must
       point  to  an  unshared Tcl object.  Any attempt to set the value of a shared Tcl object violates Tcl's copy-on-write policy.  Any existing
       string representation or internal representation in the unshared Tcl object will be freed as a consequence of setting the new value.

       Tcl_GetDoubleFromObj attempts to retrieve a double value from the Tcl object objPtr.  If the attempt succeeds, then TCL_OK is returned, and
       the  double  value  is  written to the storage pointed to by doublePtr.	If the attempt fails, then TCL_ERROR is returned, and if interp is
       non-NULL, an error message is left in interp.  The Tcl_ObjType of objPtr may be changed to make subsequent  calls  to  Tcl_GetDoubleFromObj
       more efficient.

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)