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Why are Oracle table/column/index names limited to 30 characters?
...RRM which is limited to 255 characters, and which most clients use to make errors visible. I suspect increasing the allowable size of constraint names significantly would impact the ability to report on the violations (especially where a constraint violation has been bubbled up through a few layers ...
Python syntax for “if a or b or c but not all of them”
...'x', 'y', 'z'])
args = parser.parse_args()
if len(args.abc) != 3:
parser.error('expected 3 arguments')
print(args.abc)
Here are some usage examples:
# default case
wim@wim-zenbook:/tmp$ ./three_or_none.py
['x', 'y', 'z']
# explicit case
wim@wim-zenbook:/tmp$ ./three_or_none.py 1 2 3
['1', '2'...
Get button click inside UITableViewCell
...
can you help me, i am getting error at this line: class MyTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, OptionButtonsDelegate //error: Redundant conformance of 'MyTableViewController' to protocol 'UITableViewDataSourc...
How to use SSH to run a local shell script on a remote machine?
...;'END2'
# Another bunch of commands on another host
wall <<'ENDWALL'
Error: Out of cheese
ENDWALL
ftp ftp.secureftp-test.com <<'ENDFTP'
test
test
ls
ENDFTP
END2
ENDSSH
You can actually have a conversation with some services like telnet, ftp, etc. But remember that heredoc just sends th...
Aborting a shell script if any command returns a non-zero value?
...-e
./configure > configure.log
make
... which works as expected: an error in configure aborts the execution.
Tomorrow you make a seemingly trivial change:
#!/bin/bash
set -e
./configure | tee configure.log
make
... and now it does not work. This is explained here, and a workaround (Bash...
UIWebView open links in Safari
...ew: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: NSError) {
print(error.localizedDescription)
}
func webView(webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
print("Strat to load")
}
func webView(web...
How to replace all occurrences of a character in string?
...il your s.find starts returning npos. I suppose you could also catch range_error to exit the loop, but that's kinda ugly.
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What new capabilities do user-defined literals add to C++?
...
The advantage is that a run-time exception is converted to a compile-time error.
You couldn't add the static assert to the bitset ctor taking a string (at least not without string template arguments).
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How to watch for array changes?
... eventName).toLowerCase();
if (!(eventName in _handlers)) throw new Error("Invalid event name.");
if (typeof handler !== "function") throw new Error("Invalid handler.");
_handlers[eventName].push(handler);
}
});
Object.defineProperty(_self, "removeEventListener", {
...
What's the difference between a file descriptor and file pointer?
...contains this file descriptor amongst other things such as end-of-file and error indicator, stream position etc.
So using fopen() gives you a certain amount of abstraction compared to open(). In general you should be using fopen() since that is more portable and you can use all the other standard C...