05-14-2014
Thanks, Corona688, for reply and sharing your thoughts on that matter!
The point about following the Java style is reasonable (while, actually, not big deal.)
'Cleaner' ?, hmm, hard to be agree, but it is not a point to discuss: just personal opinion.
Others points I see in your review are: propagate up to where it will be decided to process.
That is, definitely, benefits: in C it could be done by special additional coding that is not pleasant to write and not nice usually.
The benefit of catching everything, even dot defined error, also is something: not handled error will be processed by system, but C error processing have no mechanism to 'prepare' any how to getting out of program.
Sure, it is useful.
And, finally, I have realized some 'coding layout' benefits:
- initial 'strait forward' C-error handling assume checking for an error and processing it in place where it could occur.
- the C++ style by that mechanizm is offering the syntax that provides the chance to move the error handling activity out of main business logic ( like in C having a separate function to check of any error condition where all possible errors would be defined, checked and processed when heppened.)
Sure, all those make sense to use it!
Appreciate your input and chance to realize all that!
THANKS!
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LEARN ABOUT OPENDARWIN
catch
catch(n) Tcl Built-In Commands catch(n)
__________________________________________________________________________________________________________________________________________________
NAME
catch - Evaluate script and trap exceptional returns
SYNOPSIS
catch script ?varName?
_________________________________________________________________
DESCRIPTION
The catch command may be used to prevent errors from aborting command interpretation. Catch calls the Tcl interpreter recursively to exe-
cute script, and always returns without raising an error, regardless of any errors that might occur while executing script.
If script raises an error, catch will return a non-zero integer value corresponding to one of the exceptional return codes (see tcl.h for
the definitions of code values). If the varName argument is given, then the variable it names is set to the error message from interpret-
ing script.
If script does not raise an error, catch will return 0 (TCL_OK) and set the variable to the value returned from script.
Note that catch catches all exceptions, including those generated by break and continue as well as errors. The only errors that are not
caught are syntax errors found when the script is compiled. This is because the catch command only catches errors during runtime. When
the catch statement is compiled, the script is compiled as well and any syntax errors will generate a Tcl error.
EXAMPLES
The catch command may be used in an if to branch based on the success of a script.
if { [catch {open $someFile w} fid] } {
puts stderr "Could not open $someFile for writing
$fid"
exit 1
}
The catch command will not catch compiled syntax errors. The first time proc foo is called, the body will be compiled and a Tcl error will
be generated.
proc foo {} {
catch {expr {1 +- }}
}
SEE ALSO
error(n), break(n), continue(n)
KEYWORDS
catch, error
Tcl 8.0 catch(n)