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Top Forums Programming C++ - 'try, throw, catch' compare to regular C-style 'if' - advantages? Post 302901598 by alex_5161 on Wednesday 14th of May 2014 12:53:55 PM
Old 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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dot-forward(1)						      General Commands Manual						    dot-forward(1)

NAME
dot-forward - read a .forward file under qmail SYNOPSIS
in ~/.qmail: | dot-forward [ -nN ] file ... OVERVIEW
dot-forward forwards incoming messages according to sendmail-style instructions in file, if file exists. Normally file is .forward. WARNING: If you create a .qmail file to enable dot-forward, make sure to add a second line specifying delivery to your normal mailbox. For example: |dot-forward .forward ./Mailbox COMPATIBILITY WARNING: dot-forward does not support :include: or mbox deliveries. You can use the delivery mechanism described in dot- qmail(5) instead. OPTIONS
-N (Default.) Read and forward a message. -n Parse file and print the forwarding instructions in it, one per line; do not follow the instructions. You can use this option from the command line to see how your .forward file will be interpreted: dot-forward -n .forward FILE HANDLING
When a message arrives, dot-forward opens file and handles it as discussed below. It exits 99, so qmail-local will ignore further instruc- tions in .qmail. Exception: If file specifies delivery directly to you, dot-forward exits 0, so qmail-local will read further instructions in .qmail. If file does not exist, dot-forward exits 0. You can list several files; then dot-forward will try each one in turn, using the first one that exists, or exiting 0 if none exist. COMPATIBILITY WARNING: dot-forward treats an empty file as if it did not exist. Versions of sendmail before V8 would throw away the incom- ing message. COMPATIBILITY WARNING: If dot-forward encounters a temporary error opening file, it exits 111, so that qmail-local will try again later. sendmail assumes incorrectly that file does not exist. COMPATIBILITY WARNING: file must be readable by dot-forward, which is normally running as the user. sendmail places different constraints on its .forward permissions, since it is normally running as root. FORWARDING
Normally file contains an address. dot-forward forwards the message to that address. The address is parsed as if it were in an RFC 822 message header. Parenthesized comments and bracketed addresses are permitted: bob (Bob, the postmaster) @heaven.af.mil Addresses with special characters must be quoted: "spaced out mailbox"@heaven.af.mil Address groups are not permitted. file can contain any number of lines, each line containing any number of addresses. dot-forward forwards the message to each address: bob, fred, susan Joe Shmoe <shmoe@heaven.af.mil> An address without a fully qualified domain name is handled as described in qmail-header(5). Exception: Certain addresses without domain names are handled specially, as described below. DIRECT DELIVERY
If an address does not contain a domain name, and matches the environment variable $USER (without regard to case), it specifies delivery directly to you. If an address matches $USER@$HOST (without regard to case), it specifies delivery directly to you. COMPATIBILITY WARNING: sendmail's handling of quotes and backslashes violates RFC 821 and RFC 822, and is not supported by dot-forward. dot-forward treats joe the same way as joe. The dot-qmail delivery mechanism lets each user manage several addresses, so there is no need for a special syntax to get around forwarding. COMMANDS
If an address does not contain a domain name, and begins with a vertical bar, dot-forward takes the rest of the address as a command to run: bob, "|vacation bob" dot-forward feeds the message to the command, preceded by the environment variables $UFLINE, $RPLINE, and $DTLINE. COMPATIBILITY WARNING: Internet addresses can legitimately start with a slash or vertical bar. dot-forward treats anything with an unquoted @ as an address. sendmail appears to have various problems coping with these addresses, and with commands that contain @ signs. COMMENTS
Any line in file that begins with # is ignored: # this is a comment COMPATIBILITY WARNING: Versions of sendmail before V8 did not allow comments in .forward files. VERSION
This is dot-forward 0.71. The dot-forward home page is http://pobox.com/~djb/dot-forward.html. SEE ALSO
qmail-header(5), dot-qmail(5) dot-forward(1)
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