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What does the @ symbol represent in objective-c?

...structs. The major exceptions are id, Class, nil, and Nil, which are generally treated as language keywords even though they may also have a typedef or #define behind them. For example, the compiler actually does treat id specially in terms of the pointer type conversion rules it applies to declar...
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Implementing comparison operators via 'tuple' and 'tie', a good idea?

(Note: tuple and tie can be taken from Boost or C++11.) When writing small structs with only two elements, I sometimes tend to choose a std::pair , as all important stuff is already done for that datatype, like operator< for strict-weak-ordering. The downsides though are the pretty much us...
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What is in your Mathematica tool bag? [closed]

We all know that Mathematica is great, but it also often lacks critical functionality. What kind of external packages / tools / resources do you use with Mathematica? ...
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What do the arrow icons in Subclipse mean?

...→ Ignored Resources. - A file not under version control. These are typically new files that you have not committed to the repository yet. - A versioned file that needs to be added to the remote repository. These are typically files you have either renamed, or moved to a different directory. - A...
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Passing variable number of arguments around

...I have a C function which takes a variable number of arguments: How can I call another function which expects a variable number of arguments from inside of it, passing all the arguments that got into the first function? ...
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Difference between document.addEventListener and window.addEventListener?

...o events destined for a different object. You should use the one that actually has the event you are interested in. For example, there is a "resize" event on the window object that is not on the document object. For example, the "DOMContentLoaded" event is only on the document object. So basical...
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How do I enable TODO/FIXME/XXX task tags in Eclipse?

In all my years of using Eclipse, I never knew until now that TODO / FIXME / XXX comment tags are supposed to appear in the task list. Apparently this is something that is disabled by default because I have been using those tags for as long as I've been using Eclipse and I have never seen one of the...
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Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)

Does C++ support ' finally ' blocks? 16 Answers 16 ...
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What's the difference between interface and @interface in java?

...rsity, so I'm a little out of touch - at any rate I've been working on a small Java project this week, and using Intellij IDEA as my IDE, for a change of pace from my regular .Net development. ...
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How can I find the first occurrence of a sub-string in a python string?

... knowledge: rfind and rindex: In general, find and index return the smallest index where the passed-in string starts, and rfind and rindex return the largest index where it starts Most of the string searching algorithms search from left to right, so functions starting with r indicate that the...