Abbreviated form of incr Tcl, iTcl is the term used for referring to the object- oriented extensions meant for Tcl programming language. Let’s learn more about . The name is often written as “itcl” as that contains no metacharacters (i.e., space or brackets). BOOK Tcl/Tk Tools: contains an out of date tutorial for itcl. A more tutorial introduction is presented in the paper included with this distribution. See the class command for more details on creating and using classes.

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The last known release of iTcl provides enhanced performance as well as a host of different features such as: Retrieved from ” https: As you can see, we have the same behaviour as before.

Object Oriented Programming in Tcl

In that case we could have defined the Log command as follows: Therefore, after making the check we want to just pass on the request to the base class method and not duplicate its code. Nevertheless, as we go along we will briefly describe some basic concepts for the benefit of the reader who really is completely unexposed to OO programming.

Scripting languages Dynamically typed programming languages Tcl programming language family software Programming language topic stubs.

Specialization is done through the oo:: In fact, like any other Tcl command, the object command can be renamed. Note the difference between the variable statement in the context of a class definition and the variable command used to define namespace variables. Every object is a data bag consisting of a unique set of methods or procedures, which are used for its manipulation. Notice when we create an object using new the namespace matches the object command name.


As it should be. The same command will also let you check whether the object belongs to a class, taking inheritance into account.

The question then arises as to what happens to objects that have already been created if a class is modified. We use the info level command to show the stack level.

Using multiple mixins A class or object may have multiple classes mixed in. The info class superclasses command returns the direct superclasses of a class. If a derived class does not define a constructor, as is true for the CheckingAccount class, the base class constructor is invoked when the tytorial is created.

Introspection There are three things extremely hard: Method visibility can be changed by using the export and unexport commands inside a oo:: They are not explicitly invoked by name. At the same time it is a class and hence must be an instance of oo:: When the freeze procedure is passed an Account object, it uses oo:: A class is loosely speaking a template that defines the data items itcll methods collectively called members encapsulated by objects of tuttorial specific type.

itcl (n) – Linux Man Pages

A sticky note application can be finished in less than an hour! Moreover, the filter is not required to call the target method at all.


The new method generates a name for the created object. Methods that begin with a lower case letter are exported by default.

Many OO-purists, and tuhorial non-purists like the author, believe this to be desirable. ClassMixin method method m:: It does not affect methods defined in the class so the original UpdateBalance will still be in place and will no longer tuhorial overridden.

This practice breaks encapsulation and is not recommended. A class or object may have multiple classes mixed in. See the abovementioned reference for implementation details. Note our method definitions are empty because we are not actually going to call them.

itcl – object-oriented extensions to Tcl – Linux Man Pages (n)

Ever since its introduction in the yeariTcl or incr Tcl has gone on to gain huge popularity among the Tcl Tk enthusiasts, and their development community. Note that next may be called at any point in the method, not necessarily in the beginning or the end. Methods are defined through the method command which, like variableis executed as part of a class definition script.