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Is there a performance difference between i++ and ++i in C++?
...l still get the same resulting code. In fact, without reading the count in from the user, the optimizer got the whole thing down to a constant. So this:
for(int i=0; i<10; i++)
{
testFoo++;
}
printf("Value: %d\n", testFoo.GetData());
Resulted in the following:
00401000 push 0Ah ...
Difference between objectForKey and valueForKey?
...ject as key.
Last, NSDictionary's implementation of valueForKey: deviates from the standard behavior defined in KVC's documentation, and will NOT emit a NSUnknownKeyException for a key it can't find - unless this is a "special" key - one that begins with '@' - which usually means an "aggregation" f...
How to use concerns in Rails 4
...nheritance? What's wrong with creating a common base class and subclassing from that common base class?
– Chloe
Sep 6 '15 at 0:14
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Iterator Loop vs index loop [duplicate]
...r code becomes more portable between containers. You can switch containers from std::vector to std::list or other container freely without changing much if you use iterator such rule doesn't apply to operator[].
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Targeting position:sticky elements that are currently in a 'stuck' state
... It isn't just position... imagine a :stuck that changes the top value from 0 to 300px, then scroll down 150px... should it stick or not? Or think about an element with position: sticky and bottom: 0 where the :stuck maybe changes font-size and therefore the elements size (therefore changing t...
$on and $broadcast in angular
...
The best way to avoid deciding between $emit or $broadcast is to channel from the $rootScope and use $broadcast to all its children. Which makes our case much easier since our dom elements are siblings.
Adding $rootScope and lets $broadcast
app.controller('FirstCtrl', function($rootScope, $scop...
Is it possible to decrypt MD5 hashes?
...ecommendation beyond "Don't roll your own authentication system." Find one from a reputable supplier, and use that. Both the design and implementation of security systems is a tricky business.
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Abort makefile if variable not set
... variable only if a certain target is invoked.
$(call check_defined, ...) from inside the recipe
Just move the check into the recipe:
foo :
@:$(call check_defined, BAR, baz value)
The leading @ sign turns off command echoing and : is the actual command, a shell no-op stub.
Showing targe...
Return type of '?:' (ternary conditional operator)
...no copy is made. — end note] by copy-initializing a temporary of type T2 from E1 and using that temporary as the converted operand.
Otherwise (i.e., if E1 or E2 has a non class type, or if they both have class types but the underlying classes are not either the same or one a base class of the othe...
Understanding Fragment's setRetainInstance(boolean)
... to saved orientation changing Time.Say I have download a bunch of Bitmaps from server and each one is 1MB, when the user accidentally rotate his device, I certainly don't want to do all the download work again.So I create a Fragment holding my bitmaps and add it to the manager and call setRetainIns...