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Why are C# interface methods not declared abstract or virtual?
... a list of interface vtables, one vtable per interface (so that the method order is preserved). This is how COM interfaces are typically implemented as well.
In .NET, though, interfaces are not implemented as distinct vtables for each class. Interface methods are indexed through a global interfac...
Difference between binary tree and binary search tree
...nition ahead) each point to a binary tree.
A binary search tree (BST) or "ordered binary tree" is a type of binary tree where the nodes are arranged in order: for each node, all elements in its left subtree are less to the node (<), and all the elements in its right subtree are greater than the ...
Can hash tables really be O(1)?
...for use in a dictionary does not have to look at every bit in the input in order to calculate the hash. Implementations are free to look at only a fixed number of bits.
For sufficiently many items the number of items will become greater than the number of possible hashes and then you will get colli...
Converting a JS object to an array using jQuery
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@KarelBílek Is iteration order for a JS object ever guaranteed? 'An object is a member of the type Object. It is an unordered collection of properties each of which contains a primitive value, object, or function.'
– Meshaal
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Useful example of a shutdown hook in Java?
...n sequence it will start all registered shutdown hooks in some unspecified order and let them run concurrently. When all the hooks have finished it will then run all uninvoked finalizers if finalization-on-exit has been enabled. Finally, the virtual machine will halt.
That is, a shutdown hook keep...
what is Promotional and Feature graphic in Android Market/Play Store?
...s not required to save and publish your Store Listing, it is
required in order to be featured on Google Play.
Commentary:
To be clear, these "promotions" are chosen at Google's discretion. Even though excellent the "This is a test" app demonstration (above) shows the Feature graphic used in com...
Presenting a UIAlertController properly on an iPad using iOS 8
...here
}];
// note: you can control the order buttons are shown, unlike UIActionSheet
[alertController addAction:destroyAction];
[alertController addAction:otherAction];
[alertController setModalPresentationStyle:UIModalPresentationPopover];
UIPopoverPresentationC...
Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...r cache thrashing, if I can coin a term.
Caches work by indexing with low order bits and tagging with high order bits.
Imaging that your cache has 4 words and your matrix is 4 x 4. When a column is accessed and the row is any power of two in length, then each column element in memory will map to t...
Make div stay at bottom of page's content all the time even when there are scrollbars
...ht : 100%' to the main generated FORM tag as well as HTML and BODY tags in order for this to work.
– msouth
May 28 '15 at 14:38
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What is Inversion of Control?
...rol is inverted... instead of the computer accepting user input in a fixed order, the user controls the order in which the data is entered, and when the data is saved in the database.
Basically, anything with an event loop, callbacks, or execute triggers falls into this category.
...