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How to choose an AES encryption mode (CBC ECB CTR OCB CFB)?
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ECB should not be used if encrypting more than one block of data with the same key.
CBC, OFB and CFB are similar, however OFB/CFB is better because you only need encryption and not decryption, which can save code space.
CTR is used if you want good parallelization (ie. speed), instead of CB...
How to define optional methods in Swift protocol?
Is it possible in Swift? If not then is there a workaround to do it?
19 Answers
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Is a view faster than a simple query?
...ueries.
Update: At least three people have voted me down on this one. With all due respect, I think that they are just wrong; Microsoft's own documentation makes it very clear that Views can improve performance.
First, simple views are expanded in place and so do not directly contribute to perf...
How to find memory leak in a C++ code/project?
...ory only if you've deleted. In the code below, str acquires a new address with the second allocation. The first address is lost irretrievably, and so are the 30 bytes that it pointed to. Now they're impossible to free, and you have a memory leak:
char* str = new char [30]; // Give str a memory addr...
Build an iOS app without owning a mac? [closed]
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Let me tell you step by step few years back I was in same situation.
So We have two Phases
iPhone/iPad (iOS) app development
iPhone/iPad (iOS) app development and Publish to iTunes Store
1. iPhone/iPad (iOS) app development
So If you just want to develop iOS apps you don't want...
Syntax behind sorted(key=lambda: …)
I don't quite understand the syntax behind the sorted() argument:
9 Answers
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Using a ListAdapter to fill a LinearLayout inside a ScrollView layout
I'm facing a very common problem:
I layed out an activity and now it turns out it should display a few items within this ScrollView . The normal way to do that would be to use the existing ListAdapter , connect it to a ListView and BOOM I'd have my list of items.
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Why can I add named properties to an array as if it were an object?
... javascript is an object, so you can "abuse" an Array object by setting arbitrary properties on it. This should be considered harmful though. Arrays are for numerically indexed data - for non-numeric keys, use an Object.
Here's a more concrete example why non-numeric keys don't "fit" an Array:
var...
Flushing footer to bottom of the page, twitter bootstrap
I am generally familiar with the technique of flushing a footer using css.
34 Answers
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CSS background opacity with rgba not working in IE 8
I am using this CSS for background opacity of a <div> :
15 Answers
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