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What's the difference between the 'ref' and 'out' keywords?
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The ref modifier means that:
The value is already set and
The method can read and modify it.
The out modifier means that:
The Value isn't set and can't be read by the method until it is set.
The method must set it before returning.
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What is the combinatory logic equivalent of intuitionistic type theory?
I recently completed a university course which featured Haskell and Agda (a dependent typed functional programming language), and was wondering if it was possible to replace lambda calculus in these with combinatory logic. With Haskell this seems possible using the S and K combinators, thus making i...
How can I make the Android emulator show the soft keyboard?
...rd display not displaying when it should. However, I don't have a device handy for testing. The problem is that the emulator never shows the soft keyboard .
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instanceof Vs getClass( )
I see gain in performance when using getClass() and == operator over instanceOf operator.
4 Answers
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PHP and Enumerations
...o give predefined values which IDEs' auto-completion features could understand.
37 Answers
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CursorLoader usage without ContentProvider
Android SDK documentation says that startManagingCursor() method is depracated:
5 Answers
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The requested operation cannot be performed on a file with a user-mapped section open
...th Unlocker, even when it was saying that there was no lock over the file, and I couldn't delete the folder until I didn't delete that single file...
After that it compiled.
EDIT:
I found out why in my case this was happening. I had the DLL opened in a text editor inside Visual Studio...
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How to change a nullable column to not nullable in a Rails migration?
I created a date column in a previous migration and set it to be nullable. Now I want to change it to be not nullable. How do I go about doing this assuming there are null rows in that database? I'm ok with setting those columns to Time.now if they're currently null.
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parseInt vs unary plus, when to use which?
...ore like parseFloat since it also accepts decimals.
parseInt on the other hand stops parsing when it sees a non-numerical character, like the period that is intended to be a decimal point ..
+'2.3' === 2.3; //true
parseInt('2.3',10) === 2; //true
parseInt and parseFloat parses and bu...
How to use WinForms progress bar?
...groundWorker. If you have a loop that large in your WinForm it will block and your app will look like it has hanged.
Look at BackgroundWorker.ReportProgress() to see how to report progress back to the UI thread.
For example:
private void Calculate(int i)
{
double pow = Math.Pow(i, i);
}
pri...