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Is this a “good enough” random algorithm; why isn't it used if it's faster?
...f you wanted get a look at sequences of longer than width*height you could xor the next image with this one pixel-per-pixel. I think the QuickRandom picture is much more aesthetically pleasing though, on account of it being textured like a seaweed carpet.
– Cris Stringfellow
...
__FILE__, __LINE__, and __FUNCTION__ usage in C++
... It's possible with constexpr that uses a lookup table or bitwise XOR, etc. to obfuscate any string literals in your binary. There are various examples out there if you search. Of course obfuscation is just obfuscation and not security, but if you don't want to make your files and functions...
What is the best algorithm for overriding GetHashCode?
... quite how important that is.)
This is better than the common practice of XORing hashcodes for two main reasons. Suppose we have a type with two int fields:
XorHash(x, x) == XorHash(y, y) == 0 for all x, y
XorHash(x, y) == XorHash(y, x) for all x, y
By the way, the earlier algorithm is the one c...
What's the (hidden) cost of Scala's lazy val?
...) and initializes the target field in a synchronized block if the relevant xor of the bitmap indicates it is necessary.
Using:
class Something {
lazy val foo = getFoo
def getFoo = "foo!"
}
produces sample bytecode:
0 aload_0 [this]
1 getfield blevins.example.Something.bitmap$0 : int [15...
How do you set, clear, and toggle a single bit?
... string with the bitwise NOT operator (~), then AND it.
Toggling a bit
The XOR operator (^) can be used to toggle a bit.
number ^= 1UL << n;
That will toggle the nth bit of number.
Checking a bit
You didn't ask for this, but I might as well add it.
To check a bit, shift the number n to the ri...
How can I ensure that a division of integers is always rounded up?
...ositive by checking that the signs of both integers are identical. Integer xor operator '^' on the two values will result in a 0 sign-bit when this is the case, meaning a non-negative result, so the check (a ^ b) >= 0 determines that the result should have been positive before rounding. Also note...
Why is address zero used for the null pointer?
... costly than now. The number zero can be conveniently calculated using an XOR instruction or without the need to load an immediate value. Depending upon the architecture, this could potentially save space.
– Sparky
May 3 '10 at 17:46
...
Is the != check thread safe?
...oll}
0x00000000027dccdb: jmp 0x00000000027dccd1
0x00000000027dccdd: xor ebp,ebp
0x00000000027dccdf: jmp 0x00000000027dccc6
0x00000000027dcce1: mov edx,0xffffff86
0x00000000027dcce6: mov QWORD PTR [rsp+0x20],rbx
0x00000000027dcceb: call 0x00000000027a90a0 ; OopMap{rbp=Oo...
Strange out of memory issue while loading an image to a Bitmap object
... - There's a big problem with that code. ^ doesn't raise 2 to a power, it xors 2 with the result. You want Math.pow(2.0, ...). Otherwise, this looks good.
– DougW
Oct 13 '10 at 7:42
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MFC学习总结 (90个技巧) dlg 上建立View - C/C++ - 清泛网 - 专注C++内核技术
...用于与它要显示的位置的图像做“AND”操作，另一个作“XOR”操作。
透明：用“白色”AND,用“黑色”XOR
反色：用“白色”AND,用“白色”XOR
正常色：用“黑色”AND,用正常颜色XOR.
(2). WIN9X中好像是对像素的操作实现透明的
WIN...