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Haskell Type vs Data Constructor
...ta constructor that is a function taking some values as its arguments, and then uses those to construct a new value. If you have done any object-oriented programming, you should recognise this. In OOP, constructors also take some values as arguments and return a new value!
In this case, if we apply...
Returning a value from thread?
...res. Create a variable that will hold the return value from the thread and then capture it in a lambda expression. Assign the "return" value to this variable from the worker thread and then once that thread ends you can use it from the parent thread.
void Main()
{
object value = null; // Used to ...
Handling the window closing event with WPF / MVVM Light Toolkit
..., assign to DataContext etc.
Closing += viewModel.OnWindowClosing;
}
Then add the handler to the ViewModel:
using System.ComponentModel;
public void OnWindowClosing(object sender, CancelEventArgs e)
{
// Handle closing logic, set e.Cancel as needed
}
In this case, you gain exactly noth...
Java “user.dir” property - what exactly does it mean?
...e where the user has permission to run java.
So if you cd into /somedir, then run your program, user.dir will be /somedir.
A different property, user.home, refers to the user directory. As in /Users/myuser or /home/myuser or C:\Users\myuser.
See here for a list of system properties and their de...
back button callback in navigationController in iOS
...ller
[self.navigationController popToRootViewControllerAnimated:YES];
}
Then you can do things like raise an UIAlertView to confirm the action, then pop the view controller, etc.
Or instead of creating a new backbutton, you can conform to the UINavigationController delegate methods to do actions...
Big O, how do you calculate/approximate it?
... 8, ..., 2 * N". Index i actually goes up to 2 * N - 2, the loop will stop then.
– Albert
Feb 12 '16 at 13:12
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show 1 more comment
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A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7
...eipt and all its in-app purchases. First we verify the receipt itself, and then we simply check if the receipt contains the product of the transaction.
Below is the method that we called back at the beginning. From RMStoreAppReceiptVerificator:
- (BOOL)verifyTransaction:(SKPaymentTransaction*)tran...
Can't use modulus on doubles?
... @Paul: That's probably not a bug. If angle is, say, 359.9999999, then both angle and fmod(angle, 360) are likely to be displayed as 360. (Add more 9s as needed.) Try printing the values with, say, 50 digits of precision.
– Keith Thompson
Jan 2 '18 at ...
Android ListView not refreshing after notifyDataSetChanged
...you don't want to pass a new list to your adapter (as it seems you don't), then just use items.addAll after your clear(). This will ensure you are modifying the same list that the adapter has a reference to.
share
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How to automatically generate a stacktrace when my program crashes
... What would happen if the crash comes from inside malloc? Wouldn't you then hold a lock and then get stuck as "backtrace" tries to allocate memory?
– Mattias Nilsson
Apr 17 '12 at 6:39
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