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What does @@variable mean in Ruby?
...tricky subject to wrap your mind around, and there is plenty of additional reading on the subject, but think about it as modifying the Class class, but only the instance of the Class class you're working with. An example:
class Polygon
class << self
attr_accessor :sides
end
end
class...
Break when a value changes using the Visual Studio debugger
...able for managed code? I see this option disabled for C# project. Remember reading somewhere this is a tough feature to implement in debugging managed apps especially with garbage collector involved.
– Gulzar Nazim
Oct 1 '08 at 23:25
...
performSelector may cause a leak because its selector is unknown
...void *)imp;
func(_controller, selector);
Or more tersely (though hard to read & without the guard):
SEL selector = NSSelectorFromString(@"someMethod");
((void (*)(id, SEL))[_controller methodForSelector:selector])(_controller, selector);
Explanation
What's going on here is you're asking th...
Assigning code to a variable
...see how they could be useful in your situation:
There are many delegates already defined by .NET libraries, with some like Action, which do not accept any parameter and does no return a value. It is defined as public delegate void Action();
You can always use it to your needs instead of the need of ...
How can I tell if a DOM element is visible in the current viewport?
...l bugs.
The solution selected as correct is almost never precise. You can read more about its bugs.
This solution was tested on Internet Explorer 7 (and later), iOS 5 (and later) Safari, Android 2.0 (Eclair) and later, BlackBerry, Opera Mobile, and Internet Explorer Mobile 9.
function isE...
Error: Can't set headers after they are sent to the client
...
The res object in Express is a subclass of Node.js's http.ServerResponse (read the http.js source). You are allowed to call res.setHeader(name, value) as often as you want until you call res.writeHead(statusCode). After writeHead, the headers are baked in and you can only call res.write(data), and ...
What's the difference between SoftReference and WeakReference in Java?
...n be cheaper if code creates new objects without regard for whether they already exist, but a comparison between an object and itself (identical references) will be...
– supercat
Sep 19 '17 at 14:29
...
Open a URL in a new tab (and not a new window)
...ferent ways in which they handle a user's browser preferences.
Additional Reading
window.open documentation.
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How does a language expand itself? [closed]
...ight that in general, libraries cannot make anything possible that isn't already possible.
But the libraries don't have to be written in C++ in order to be usable by a C++ program. Even if they are written in C++, they may internally use other libraries not written in C++. So the fact that C++ didn...
Inserting image into IPython notebook markdown
...
Please re-read the answer and comments. Your url will always start with 'files/', so if you have k.png next to your notebook, the URL would be src="files/k.png".
– minrk
Apr 24 '13 at 5:04
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