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Define: What is a HashSet?
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A HashSet holds a set of objects, but in a way that it allows you to easily and quickly determine whether an object is already in the set or not. It does so by internally managing an array and storing the object using an index which is calculated from the hashcode of the objec...
How do I automatically scroll to the bottom of a multiline text box?
I have a textbox with the .Multiline property set to true. At regular intervals, I am adding new lines of text to it. I would like the textbox to automatically scroll to the bottom-most entry (the newest one) whenever a new line is added. How do I accomplish this?
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ssh “permissions are too open” error
I had a problem with my mac where I couldn't save any kind of file on the disk anymore.
I had to reboot OSX lion and reset the permissions on files and acls.
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RabbitMQ and relationship between channel and connection
The RabbitMQ Java client has the following concepts:
4 Answers
4
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Why can't I use float value as a template parameter?
... C++ standard does not allow float (i.e. real number) or character string literals to be used as template non-type parameters. You can of course use the float and char * types as normal arguments.
Perhaps the author is using a compiler that doesn't follow the current standard?
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What is Type-safe?
...bar";
This also applies to method arguments, since you are passing explicit types to them:
int AddTwoNumbers(int a, int b)
{
return a + b;
}
If I tried to call that using:
int Sum = AddTwoNumbers(5, "5");
The compiler would throw an error, because I am passing a string ("5"), and it is e...
How to check for an active Internet connection on iOS or macOS?
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Important: This check should always be performed asynchronously. The majority of answers below are synchronous so be careful otherwise you'll freeze up your app.
Swift
1) Install via CocoaPods or Carthage: https://github.com/ashleymills/Reachability.swift
2) Test reachability via closures
let...
How do I create a namespace package in Python?
...you want to release related libraries as separate downloads. For example, with the directories Package-1 and Package-2 in PYTHONPATH ,
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Cocoa Autolayout: content hugging vs content compression resistance priority
... Click Me ]
and you've pinned the edges to a larger superview with priority 500.
Then, if Hugging priority > 500 it'll look like this:
[Click Me]
If Hugging priority < 500 it'll look like this:
[ Click Me ]
If the superview now shrinks then, if the Compression Res...
When to favor ng-if vs. ng-show/ng-hide?
...attach the handler.
ng-show/ng-hide does not remove the elements from DOM. It uses CSS styles to hide/show elements (note: you might need to add your own classes). This way your handlers that were attached to children will not be lost.
ng-if creates a child scope while ng-show/ng-hide does not
Ele...