Global Variables

The following global symbols are defined by tcl++:

interp

The default interpreter used by Tcl/Tk

mainWin

The window used by Tk, of type Tk_Window, useful for obtaining X information such as colourmaps

TclError

A longjmp label used for trapping errors - this will be replaced by exception handling once g++ has this ability

error

To flag an error, call error(char *format,...). The format string is passed to sprintf, along with all remaining arguments. The error message is attached to Tcl's error log, and then control branches to TclError, which returns a TCL_ERROR code back to Tcl.