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Understanding typedefs for function pointers in C
...= (*myFnPtr)(2.0, 5.1);
This makes good reading: http://www.newty.de/fpt/index.html
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Android Camera Preview Stretched
...ion, but SurfaceView doesn't recognize getChildCount () or getChildAt (int index). I think, I got it working eventually with a reference to maLayoutPreview, but it was misbehaving and applied the set ratio to my whole app and it did so after first picture was taken. So I let it go and moved the layo...
What is the difference between user and kernel modes in operating systems?
...al_Descriptor_Table
the segment registers CS, DS, etc., which point to the index of an entry in the GDT.
For example, CS = 0 means the first entry of the GDT is currently active for the executing code.
What can each ring do?
The CPU chip is physically built so that:
ring 0 can do anything
ri...
Why should I avoid using Properties in C#?
...ess constant metadata about themselves.
Interception, thanks to the above.
Indexers, which everyone who has ever had to work with COM interop and the inevitable spew of Item(i) calls will recognize as a wonderful thing.
Work with PropertyDescriptor which is essential for creating designers and for X...
Draw in Canvas by finger, Android
... i;
// now p is just the fractional part [0...1) and i is the index
int c0 = colors[i];
int c1 = colors[i+1];
int a = ave(Color.alpha(c0), Color.alpha(c1), p);
int r = ave(Color.red(c0), Color.red(c1), p);
int g = ave(Color.gre...
GetHashCode Guidelines in C#
...s in the nature of all hashtable implementations, or more generally of any indexed list, that identifying data of objects should never change, while the object is in the list. Unexpected and unpredictable behaviour will occur, if this rule is broken. Somewhere, there may be list implementations, tha...
Difference between variable declaration syntaxes in Javascript (including global variables)?
...
<title>Index.html</title>
<script>
var varDeclaration = true;
noVarDeclaration = true;
window.hungOnWindow = true;
document.hungOnDocument = true;
</script>
<script src="external.js"></scri...
How to count the number of set bits in a 32-bit integer?
...a table-lookup for 4 bits at a time of each byte in parallel. (The 4 bits index a 16 entry table held in a vector register).
On Intel CPUs, the hardware 64bit popcnt instruction can outperform an SSSE3 PSHUFB bit-parallel implementation by about a factor of 2, but only if your compiler gets it just...
How are virtual functions and vtable implemented?
...e, it's indeed structure-like. But in other contexts, but the idea of vtbl index is useful (e.g. ActiveX uses it in the way it describes dual interfaces in typelibs), which is a more array-like view.
– puetzk
Aug 2 '18 at 14:12
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Why doesn't the height of a container element increase if it contains floated elements?
...ck level above the normal floated elements. (Please don't relate this to z-index as that is completely different.)
Taking a case as an example to explain how CSS floats work, assuming we need a simple 2 column layout with a header, footer, and 2 columns, so here is what the blueprint looks like....