45 lines
1.6 KiB
Groff
45 lines
1.6 KiB
Groff
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'\"
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'\" Copyright (c) 1989-1993 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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.TH Tcl_AllowExceptions 3 7.4 Tcl "Tcl Library Procedures"
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.so man.macros
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.BS
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.SH NAME
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Tcl_AllowExceptions \- allow all exceptions in next script evaluation
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.SH SYNOPSIS
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.nf
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\fB#include <tcl.h>\fR
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.sp
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\fBTcl_AllowExceptions\fR(\fIinterp\fR)
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.SH ARGUMENTS
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.AS Tcl_Interp *interp
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.AP Tcl_Interp *interp in
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Interpreter in which script will be evaluated.
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.BE
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.SH DESCRIPTION
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.PP
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If a script is evaluated at top-level (i.e. no other scripts are
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pending evaluation when the script is invoked), and if the script
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terminates with a completion code other than \fBTCL_OK\fR, \fBTCL_ERROR\fR
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or \fBTCL_RETURN\fR, then Tcl normally converts this into a \fBTCL_ERROR\fR
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return with an appropriate message. The particular script
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evaluation procedures of Tcl that act in the manner are
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\fBTcl_EvalObjEx\fR, \fBTcl_EvalObjv\fR, \fBTcl_Eval\fR, \fBTcl_EvalEx\fR,
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\fBTcl_GlobalEval\fR, \fBTcl_GlobalEvalObj\fR, \fBTcl_VarEval\fR and
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\fBTcl_VarEvalVA\fR.
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.PP
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However, if \fBTcl_AllowExceptions\fR is invoked immediately before
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calling one of those a procedures, then arbitrary completion
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codes are permitted from the script, and they are returned without
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modification.
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This is useful in cases where the caller can deal with exceptions
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such as \fBTCL_BREAK\fR or \fBTCL_CONTINUE\fR in a meaningful way.
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.SH KEYWORDS
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continue, break, exception, interpreter
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