Object-oriented programming

Object-oriented programming has been a feature Tcl offered for several years with additional packages. This was possible due to the fact that Tcl syntax is easily extendable. Those packages include Incr Tcl, which is available from http://incrtcl.sourceforge.net/itcl/, XOTcl available from http://media.wu-wien.ac.at/ and Snit which can be obtained from http://www.wjduquette.com/snit/.

However, with the release of version 8.5, Tcl now comes with an object-oriented programming functionality included called TclOO. When Tcl 8.6 is out, TclOO will soon be part of core language. In Tcl 8.5 it is an extension to the language, but leverages 8.5 extensions to support it.

This is a set of additions that allows us to build a class hierarchy on its own. TclOO is designed so that it is possible to build wrappers so that it works the same as Incr Tcl, XOTcl, or Snit. So, for those of you that use any OO extension, it might be the right time to switch. For those of you that...