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author | William Joye <wjoye@cfa.harvard.edu> | 2018-12-25 17:48:54 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2018-12-25 17:48:54 (GMT) |
commit | 8eb0f61e2e27ef6594eee8bcf68d574fb087fe66 (patch) | |
tree | fc0f3692516c8c3e8090df20223d342a1b64df93 /tcl8.6/doc/AllowExc.3 | |
parent | 5f5fd2864a3193a8d5da12fcb92ba7379084c286 (diff) | |
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update tcl/tk
Diffstat (limited to 'tcl8.6/doc/AllowExc.3')
-rw-r--r-- | tcl8.6/doc/AllowExc.3 | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tcl8.6/doc/AllowExc.3 b/tcl8.6/doc/AllowExc.3 new file mode 100644 index 0000000..172bb30 --- /dev/null +++ b/tcl8.6/doc/AllowExc.3 @@ -0,0 +1,44 @@ +'\" +'\" Copyright (c) 1989-1993 The Regents of the University of California. +'\" Copyright (c) 1994-1996 Sun Microsystems, Inc. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +.TH Tcl_AllowExceptions 3 7.4 Tcl "Tcl Library Procedures" +.so man.macros +.BS +.SH NAME +Tcl_AllowExceptions \- allow all exceptions in next script evaluation +.SH SYNOPSIS +.nf +\fB#include <tcl.h>\fR +.sp +\fBTcl_AllowExceptions\fR(\fIinterp\fR) +.SH ARGUMENTS +.AS Tcl_Interp *interp +.AP Tcl_Interp *interp in +Interpreter in which script will be evaluated. +.BE + +.SH DESCRIPTION +.PP +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 \fBTCL_OK\fR, \fBTCL_ERROR\fR +or \fBTCL_RETURN\fR, then Tcl normally converts this into a \fBTCL_ERROR\fR +return with an appropriate message. The particular script +evaluation procedures of Tcl that act in the manner are +\fBTcl_EvalObjEx\fR, \fBTcl_EvalObjv\fR, \fBTcl_Eval\fR, \fBTcl_EvalEx\fR, +\fBTcl_GlobalEval\fR, \fBTcl_GlobalEvalObj\fR, \fBTcl_VarEval\fR and +\fBTcl_VarEvalVA\fR. +.PP +However, if \fBTcl_AllowExceptions\fR 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 \fBTCL_BREAK\fR or \fBTCL_CONTINUE\fR in a meaningful way. + +.SH KEYWORDS +continue, break, exception, interpreter |