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NSOperation vs Grand Central Dispatch
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GCD is a low-level C-based API that enables very simple use of a task-based concurrency model. NSOperation and NSOperationQueue are Objective-C classes that do a similar thing. NSOperation was introduced first, but as of 10.5 and...
How do I find the authoritative name-server for a domain name?
...ll want the SOA (Start of Authority) record for a given domain name, and this is how you accomplish it using the universally available nslookup command line tool:
command line> nslookup
> set querytype=soa
> stackoverflow.com
Server: 217.30.180.230
Address: 217.30.180.230#53...
.NET HashTable Vs Dictionary - Can the Dictionary be as fast?
...of them guarantee preserving the order of items.
Leaving boxing/unboxing issues aside, most of the time, they should have very similar performance.
The primary structural difference between them is that Dictionary relies on chaining (maintaining a list of items for each hash table bucket) to res...
while (1) Vs. for (;;) Is there a speed difference?
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In perl, they result in the same opcodes:
$ perl -MO=Concise -e 'for(;;) { print "foo\n" }'
a <@> leave[1 ref] vKP/REFC ->(end)
1 <0> enter ->2
2 <;> nextstate(main 2 -e:1) v ->3
9 <2> leaveloop vK/2 ->a
3 <{> enterloop(...
Reconnection of Client when server reboots in WebSocket
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When the server reboots, the Web Socket connection is closed, so the JavaScript onclose event is triggered. Here's an example that tries to reconnect every five seconds.
function start(websocketServerLocation){
ws = new WebSocket(websocketServerLocation);
ws.onmessag...
How to tell if node.js is installed or not
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Open a terminal window.
Type:
node -v
This will display your nodejs version.
Navigate to where you saved your script and input:
node script.js
This will run your script.
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How to use performSelector:withObject:afterDelay: with primitive types in Cocoa?
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Here is what I used to call something I couldn't change using NSInvocation:
SEL theSelector = NSSelectorFromString(@"setOrientation:animated:");
NSInvocation *anInvocation = [NSInvocation
invocationWithMethodSignature...
Undefined reference to vtable
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The GCC FAQ has an entry on it:
The solution is to ensure that all virtual methods that are not pure are defined. Note that a destructor must be defined even if it is declared pure-virtual [class.dtor]/7.
Therefore, you need to provide a definition for the virtual dest...
what is the best way to convert a json formatted key value pair to ruby hash with symbol as key?
I am wondering what is the best way to convert a json formatted key value pair to ruby hash with symbol as key:
example:
7...
Accessing constructor of an anonymous class
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edited Dec 15 '16 at 22:33
Yasin Okumuş
1,86144 g...