diff options
Diffstat (limited to 'doc/error.n')
| -rw-r--r-- | doc/error.n | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/doc/error.n b/doc/error.n index ff01a6f..c05f8b9 100644 --- a/doc/error.n +++ b/doc/error.n @@ -4,7 +4,7 @@ '\" '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. -'\" +'\" .TH error n "" Tcl "Tcl Built-In Commands" .so man.macros .BS @@ -28,7 +28,7 @@ the Tcl interpreter adds information to the \fB\-errorinfo\fR return option. If the \fIinfo\fR argument is present, it is used to initialize the \fB\-errorinfo\fR return options and the first increment of unwind information -will not be added by the Tcl interpreter. +will not be added by the Tcl interpreter. In other words, the command containing the \fBerror\fR command will not appear in the stack trace; in its place will be \fIinfo\fR. @@ -37,18 +37,21 @@ with the \fBcatch\fR command: if a caught error cannot be handled successfully, \fIinfo\fR can be used to return a stack trace reflecting the original point of occurrence of the error: +.PP .CS -\fBcatch {...} errMsg +catch {...} errMsg set savedInfo $::errorInfo \&... -error $errMsg $savedInfo\fR +\fBerror\fR $errMsg $savedInfo .CE +.PP When working with Tcl 8.5 or later, the following code should be used instead: +.PP .CS -\fBcatch {...} errMsg options +catch {...} errMsg options \&... -return -options $options $errMsg\fR +return -options $options $errMsg .CE .PP If the \fIcode\fR argument is present, then its value is stored @@ -58,15 +61,18 @@ of the error in cases where such information is available; see the \fBreturn\fR manual page for information on the proper format for this option's value. .SH EXAMPLE +.PP Generate an error if a basic mathematical operation fails: +.PP .CS if {1+2 != 3} { \fBerror\fR "something is very wrong with addition" } .CE - .SH "SEE ALSO" catch(n), return(n) - .SH KEYWORDS -error +error, exception +'\" Local Variables: +'\" mode: nroff +'\" End: |