Updated 2015-11-04 15:05:51 by pooryorick

A Tcl extension is a new command written in the implementation language of Tcl and provided via load. Because it has access to the Tcl C API and the structures that implement objects visible at the script level, an extension can extend the feature set of the Tcl interpreter. A procedure, the body of which is simply a script to be evaluated by the interpreter, lacks this capability. An extension is often included in a package, where the pkgIndex.tcl script uses load to load the extension into the interpreter process. An extension may define new actions, new widgets, new processing types, etc.

See Also  edit

Tcl Extension: User Guide
Tcl Extension: Developer Guide
Extensions for Tcl and Tk
Extending Tcl
How to write software that will be implemented as an extension, perhaps in C (or C++ code with extern "C" {} around it).
extension language