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What do the plus and minus signs mean in Objective-C next to a method?
In Objective-C, I would like to know what the + and - signs next to a method definition mean.
4 Answers
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How do you execute an arbitrary native command from a string?
I can express my need with the following scenario: Write a function that accepts a string to be run as a native command.
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What's the difference between == and .equals in Scala?
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You normally use ==, it routes to equals, except that it treats nulls properly. Reference equality (rarely used) is eq.
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What's the difference between std::move and std::forward
I saw this here:
Move Constructor calling base-class Move Constructor
3 Answers
3
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What's the difference between Invoke() and BeginInvoke()
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Do you mean Delegate.Invoke/BeginInvoke or Control.Invoke/BeginInvoke?
Delegate.Invoke: Executes synchronously, on the same thread.
Delegate.BeginInvoke: Executes asynchronously, on a threadpool thread.
Control.Invoke: Executes on...
Will HTML5 allow web apps to make peer-to-peer HTTP connections?
... central server, could create direct connections with other users of the same web app? I'm imagining a process similar to UDP hole punching.
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How do you clear a slice in Go?
...d ones certainly is:
slice = slice[:0]
But there's a m>cat m>ch. If slice elements are of type T:
var slice []T
then enforcing len(slice) to be zero, by the above "trick", doesn't make any element of
slice[:cap(slice)]
eligible for garbage collection. This might be the optimal approach in some ...
Java `final` method: what does it promise?
In a Java class a method can be defined to be final , to mark that this method may not be overridden:
5 Answers
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Add missing dates to pandas dataframe
My data can have multiple events on a given date or NO events on a date. I take these events, get a count by date and plot them. However, when I plot them, my two series don't always match.
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Why is XOR the default way to combine hashes?
Say you have two hashes H(A) and H(B) and you want to combine them. I've read that a good way to combine two hashes is to XOR them, e.g. XOR( H(A), H(B) ) .
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