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Ruby, Difference between exec, system and %x() or Backticks
...tem
The system method calls a system program. You have to provide the command as a string argument to this method. For example:
>> system("date")
Wed Sep 4 22:03:44 CEST 2013
=> true
The invoked program will use the current STDIN, STDOUT and STDERR objects of your Ruby program. In fact...
How to use single storyboard uiviewcontroller for multiple subclass
...interface but with root view controller of class SpecificViewController1 and SpecificViewController2 which are subclasses of BasicViewController .
Those 2 view controllers would have the same functionality and interface except for the IBAction method.
It would be like the following:
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Padding between ActionBar's home icon and title
Does anybody know how to set padding between the ActionBar's home icon and the title?
21 Answers
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Value of i for (i == -i && i != 0) to return true in Java
...000000000000000000
Taking the negative value is done by first swapping 0 and 1, which gives
01111111111111111111111111111111
and by adding 1, which gives
10000000000000000000000000000000
As you can see in the link I gave, Wikipedia mentions the problem with the most negative numbers and spec...
Xcode 6 iPhone Simulator Application Support location
... in Application Support for the iOS 8 iPhone Simulator. Where are my files and Core Data sqlite database being stored?
16 A...
What is the difference between `git merge` and `git merge --no-ff`?
...fference between the two. How can I observe the difference (with a git command or some tool)?
6 Answers
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Func delegate with no return type
... the Action delegates return void.
Func<TResult> takes no arguments and returns TResult:
public delegate TResult Func<TResult>()
Action<T> takes one argument and does not return a value:
public delegate void Action<T>(T obj)
Action is the simplest, 'bare' delegate:
pu...
Record file copy operation with Git
...a file in git using git-mv the status shows that the file has been renamed and even if I alter some portions it still considers to be almost the same thing (which is good because it lets me follow the history of it).
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Why does my application spend 24% of its life doing a null check?
I've got a performance critical binary decision tree, and I'd like to focus this question on a single line of code. The code for the binary tree iterator is below with the results from running performance analysis against it.
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When to use reinterpret_cast?
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The C++ standard guarantees the following:
static_casting a pointer to and from void* preserves the address. That is, in the following, a, b and c all point to the same address:
int* a = new int();
void* b = static_cast<void*>(...