Tcl_AllowExceptions(3) Tcl Library Procedures Tcl_AllowExceptions(3)

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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.
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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

Tcl 7.4 Tcl_AllowExceptions(3)