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 dou‐
ble 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)