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Published on 2009-04-26T18:29:46Z
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2010/04/07
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Why is it that ~2 is -3?
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boost::operators automatically defines operators like + based on manual implementations like += which is very useful. To generate those operators for T, one inherits from boost::operators<T> as shown by the boost example:
class MyInt : boost::operators<MyInt>
I am familiar with the CRTP…
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When you use the comparison operators in SQL with the Where clause, you can remove the columns with null values.
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When you use the comparison operators in SQL with the Where clause, you can remove the columns with null values.
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I have an enumerated type that I would like to define the , <, =, and <= operators for. I know that these operators are implictly created on the basis of the enumerated type (as per the documentation) but I would like to explictly define these operators (for clarity, for control, to know how…
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I'm creating a stack oriented virtual machine, and so I started learning Forth for a general understanding about how it would work. Then I shortlisted the essential stack manipulation operations I would need to implement in my virtual machine:
drop ( a -- )
dup ( a -- a a )
swap ( a b -- b a )
rot…
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What are some real world use cases of the following bitwise operators?
AND
XOR
NOT
OR
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Hi
Could someone translate this statement into pseudo-code (or just plain english)?
var c:uint = 0xFF << 24 | r << 16 | g << 8 | b;
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I've got the following code in a shader:
// v & y are both floats
nPixel = v;
nPixel << 8;
nPixel |= y;
and this gives me the following error in compilation:
shader.fx(80,10): error X3535: Bitwise operations not supported on legacy targets.
shader.fx(92,18): ID3DXEffectCompiler::CompileEffect:…
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I need to make transparency, having 2 pixels:
pixel1: {A, R, G, B} - foreground pixel
pixel2: {A, R, G, B} - background pixel
A,R,G,B are Byte values
each color is represented by byte value
now I'm calculating transparency as:
newR = pixel2_R * alpha / 255 + pixel1_R * (255 - alpha) / 255
newG…
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The challenge is to find the fastest way to determine in C/C++ the length of a c-string using bitwise operations in C.
char thestring[16];
The c-string has a max size of 16 chars and is inside a buffer
If the string is equal to 16 chars doesn't have the null byte at the end.
I am sure can be done…
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