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Join vs. sub-query
...version-specific and query-specific.
Historically, explicit joins usually win, hence the established wisdom that joins are better, but optimisers are getting better all the time, and so I prefer to write queries first in a logically coherent way, and then restructure if performance constraints warr...
What is the optimal algorithm for the game 2048?
... in action or read the source.
Currently, the program achieves about a 90% win rate running in javascript in the browser on my laptop given about 100 milliseconds of thinking time per move, so while not perfect (yet!) it performs pretty well.
Since the game is a discrete state space, perfect informa...
Finding Number of Cores in Java
...
@universe blowing up and such : or the machine actually has more than 2,147,483,647 logical threads available ? ;)
– Pierre Henry
Oct 22 '12 at 13:08
...
Invoke(Delegate)
...
The answer to this question lies in how C# Controls work
Controls in Windows Forms are bound to a specific thread and are not
thread safe. Therefore, if you are calling a control's method from a
different thread, you must use one of the control's invoke methods to
marshal the call to the...
Can hash tables really be O(1)?
... your runtime depends on the dataset you're running on.
Consider the following pseudocode of the get method of a hash table. Here I'm assuming we handle collision by chaining, so each entry of the table is a linked list of (key,value) pairs. We also assume the number of buckets m is fixed but is O(...
What exactly are unmanaged resources?
...inside does the "dirty work" (communicates with the operating system using Win32 dlls, calling low level functions or even assembler instructions) which really open the file. And this is, what .NET doesn't know about, unmanaged.
But you perhaps can open the file by yourself using assembler instructi...
What is the best way to create constants in Objective-C
...s defined in foundation and compiles to compatible formats for C, C++, and Win32.
As defined in NSObjCRuntime.h
#if defined(__cplusplus)
#define FOUNDATION_EXTERN extern "C"
#else
#define FOUNDATION_EXTERN extern
#endif
#if TARGET_OS_WIN32
#if defined(NSBUILDINGFOUNDATION)
#define FO...
git replacing LF with CRLF
Running git on a Windows XP machine, using bash. I exported my project from SVN, and then cloned a bare repository.
20 Answ...
How is TeamViewer so fast?
...neric desktop usage is linear movement of elements (scrolling text, moving windows, etc. opposed to transformation of elements).
The DirectX 3D performance of 1 FPS seems to confirm my guess to some extent.
share
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What is a message pump?
...
A message loop is a small piece of code that exists in any native Windows program. It roughly looks like this:
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
The GetMessage() Win32 API retrieves a message from Windo...