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scopedobject - Create and manipulate a scoped [incr Tcl]
class object.
scopedobject objName ?options?
None
- Name:
- enterscopecommand:
- Command-Line Switch:
- -enterscopecommand
Specifies a Tcl command to invoke when an object enters
scope (i.e. when it is created..). The default is {}.
- Name:
- enterscopecommand:
- Command-Line Switch:
- -enterscopecommand
Specifies a Tcl command to invoke when an object exits
scope (i.e. when it is deleted..). The default is {}.
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The scopedobject command creates a base class for defining
Itcl classes which posses scoped behavior like Tcl variables.
The objects are only accessible within the procedure
in which they are instantiated and are deleted when the procedure
returns. This class was designed to be a general
purpose base class for supporting scoped incr Tcl classes.
The options include the execute a Tcl script command when an
object enters and exits its scope.
The scopedobject command creates a new Tcl command whose
name is pathName. This command may be used to invoke various
operations on the object. It has the following general
form:
pathName option ?arg arg ...?
Option and the args determine the exact behavior of the command.
The following commands are possible for scopedobject
objects:
pathName cget option
Returns the current value of the configuration option
given by option. Option may have any of the values
accepted by the scopedobject command.
pathName configure ?option? ?value option value ...?
Query or modify the configuration options of the
object. If no option is specified, returns a list
describing all of the available options for pathName.
If option is specified with no value, then the command
returns a list describing the one named option (this
list will be identical to the corresponding sublist of
the value returned if no option is specified). If one
or more option-value pairs are specified, then the command
modifies the given objects option(s) to have the
given value(s); in this case the command returns an
empty string. Option may have any of the values
accepted by the scopedobject command.
The scopedobject was primarily meant to be a base
class. The following is an example of usage without
inheritance:
proc scopedobject_demo {} {
- scopedobject #auto
- -exitscopecommand {puts "enter scopedobject_demo"} -exitscopecommand {puts "exit scopedobject_demo"}
}
scopedobject_demo
John A. Tucker
scopedobject, object
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