01-07-2010
I know that for conditions it is boolean AND. But now came to know that it is for actions also.
The explanation given was simple & excellent, thanks.
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LEARN ABOUT SUSE
tcl_setbooleanobj
Tcl_BooleanObj(3) Tcl Library Procedures Tcl_BooleanObj(3)
__________________________________________________________________________________________________________________________________________________
NAME
Tcl_NewBooleanObj, Tcl_SetBooleanObj, Tcl_GetBooleanFromObj - store/retrieve boolean value in a Tcl_Obj
SYNOPSIS
#include <tcl.h>
Tcl_Obj *
Tcl_NewBooleanObj(boolValue)
Tcl_SetBooleanObj(objPtr, boolValue)
int
Tcl_GetBooleanFromObj(interp, objPtr, boolPtr)
ARGUMENTS
int boolValue (in) Integer value to be stored as a boolean value in a Tcl_Obj.
Tcl_Obj *objPtr (in/out) Points to the Tcl_Obj in which to store, or from which to retrieve a boolean value.
Tcl_Interp *interp (in/out) If a boolean value cannot be retrieved, an error message is left in the interpreter's result object
unless interp is NULL.
int *boolPtr (out) Points to place where Tcl_GetBooleanFromObj stores the boolean value (0 or 1) obtained from objPtr.
_________________________________________________________________
DESCRIPTION
These procedures are used to pass boolean values to and from Tcl as Tcl_Obj's. When storing a boolean value into a Tcl_Obj, any non-zero
integer value in boolValue is taken to be the boolean value 1, and the integer value 0 is taken to be the boolean value 0.
Tcl_NewBooleanObj creates a new Tcl_Obj, stores the boolean value boolValue in it, and returns a pointer to the new Tcl_Obj. The new
Tcl_Obj has reference count of zero.
Tcl_SetBooleanObj accepts objPtr, a pointer to an existing Tcl_Obj, and stores in the Tcl_Obj *objPtr the boolean value boolValue. This is
a write operation on *objPtr, so objPtr must be unshared. Attempts to write to a shared Tcl_Obj will panic. A successful write of
boolValue into *objPtr implies the freeing of any former value stored in *objPtr.
Tcl_GetBooleanFromObj attempts to retrive a boolean value from the value stored in *objPtr. If objPtr holds a string value recognized by
Tcl_GetBoolean, then the recognized boolean value is written at the address given by boolPtr. If objPtr holds any value recognized as a
number by Tcl, then if that value is zero a 0 is written at the address given by boolPtr and if that value is non-zero a 1 is written at
the address given by boolPtr. In all cases where a value is written at the address given by boolPtr, Tcl_GetBooleanFromObj returns TCL_OK.
If the value of objPtr does not meet any of the conditions above, then TCL_ERROR is returned and an error message is left in the inter-
preter's result unless interp is NULL. Tcl_GetBooleanFromObj may also make changes to the internal fields of *objPtr so that future calls
to Tcl_GetBooleanFromObj on the same objPtr can be performed more efficiently.
Note that the routines Tcl_GetBooleanFromObj and Tcl_GetBoolean are not functional equivalents. The set of values for which Tcl_Get-
BooleanFromObj will return TCL_OK is strictly larger than the set of values for which Tcl_GetBoolean will do the same. For example, the
value "5" passed to Tcl_GetBooleanFromObj will lead to a TCL_OK return (and the boolean value 1), while the same value passed to Tcl_Get-
Boolean will lead to a TCL_ERROR return.
SEE ALSO
Tcl_NewObj, Tcl_IsShared, Tcl_GetBoolean
KEYWORDS
boolean, object
Tcl 8.5 Tcl_BooleanObj(3)