Tcl8.6.16/Tk8.6.16 Documentation > Tcl C API, version 8.6.16 > AllowExc

Tcl/Tk Applications | Tcl Commands | Tk Commands | [incr Tcl] Package Commands | SQLite3 Package Commands | TDBC Package Commands | tdbc::mysql Package Commands | tdbc::odbc Package Commands | tdbc::postgres Package Commands | tdbc::sqlite3 Package Commands | Thread Package Commands | Tcl C API | Tk C API | [incr Tcl] Package C API | TDBC Package C API

NAME

Tcl_AllowExceptions — allow all exceptions in next script evaluation

SYNOPSIS

#include <tcl.h>
Tcl_AllowExceptions(interp)

ARGUMENTS

Tcl_Interp *interp (in)
Interpreter in which script will be evaluated.

DESCRIPTION

If a script is evaluated at top-level (i.e. no other scripts are pending evaluation when the script is invoked), and if the script terminates with a completion code other than TCL_OK, TCL_ERROR or TCL_RETURN, then Tcl normally converts this into a TCL_ERROR return with an appropriate message. The particular script evaluation procedures of Tcl that act in the manner are Tcl_EvalObjEx, Tcl_EvalObjv, Tcl_Eval, Tcl_EvalEx, Tcl_GlobalEval, Tcl_GlobalEvalObj, Tcl_VarEval and Tcl_VarEvalVA.

However, if Tcl_AllowExceptions is invoked immediately before calling one of those a procedures, then arbitrary completion codes are permitted from the script, and they are returned without modification. This is useful in cases where the caller can deal with exceptions such as TCL_BREAK or TCL_CONTINUE in a meaningful way.

KEYWORDS

continue, break, exception, interpreter
Copyright © 1989-1993 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.