Subject: -3- Other than C, What languages can talk to tcl/tk?
a. Shell
	There are two standard interfaces which are shell like.  The first
is wish, which is a windowing shell like interface that is a part of the Tk 
package.  The second is tcl, a line command interpreter that is part of the
Extended TCL package.

b. C++

	Check out tcl++.h in Extended Tcl.  Based on an original
implementation by Parag Patel, it defines a Tcl interpreter class by which
Tcl interpreters can be created as objects under C++.

	Mark Diekhans and Karl Lehenbauer have used this, in combination with
the handle facility in Extended Tcl, to build Tcl commands around C++ classes.

	The Tcl handle facility provides a way to manage table entries that
can be referenced by a textual handle from Tcl code.  This is provided for
applications that need to create data structures in one command, return a
reference (i.e. pointer) to that particular data structure and then access
that data structure in other commands.  An example application is file
handles.

	A handle table was built containing pointers to the instances of a
class that were to be accessed from Tcl, say a class `foo_cl', and then a
"new" command defined that created an instance of that class and returned a
Tcl handle to it.  The handle could then passed among Tcl commands that
accessed each member kfunction.  The handle is in effect an explicit `this'
pointer.

For example:

     set obj [foo_cl::new]
     foo_cl::baz $obj "Hello world"
     foo_cl::delete $obj

It's not totally object-oriented, but it's still very usable.

c. Modula-3

Norman Ramsey <elan.uucp!nr> says:

A long time back, Eric Muller posted a Modula-3 interface to the C TCL
library.  I wrote down a Modula-3/TCL interface that used Modula-3
types rather than C types, and that used objects to build closures for
commands.  I wrote part of the implementation but never finished it.
I have mailed copies to carroll@udel.edu, who asked the question, and
I will post them if there seems to be general interest.

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