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Possible to do a MySQL foreign key to one of two possible tables?
...oach with "CONSTRAINT CHECK". But it can be improved if we change "OR" to "XOR". That way we insure that only one column from set is NOT NULL
– alex_b
Aug 19 '15 at 14:18
1
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String comparison in Python: is vs. == [duplicate]
...If you have bool_a == 3 and bool_b == 4, then bool_a != bool_b, but bool_a xor bool_b is false (because both terms are true).
– dan04
Jun 7 '10 at 12:57
3
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海量数据相似度计算之simhash和海明距离 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...距离为3。对于二进制字符串的a和b，海明距离为等于在a XOR b运算结果中1的个数（普遍算法）。
为了高效比较，我们预先加载了库里存在文本并转换为simhash code 存储在内存空间。来一条文本先转换为 simhash code，然后和内存里的...
How to get memory available or used in C#
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One note. In C# ^ is bitwise XOR, not power. So just use proc.PrivateMemorySize64 / (1024*1024), or proc.PrivateMemorySize64 / (1 << 20)
– Сергей Рыбаков
May 18 at 6:15
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Renaming the current file in Vim
...ngthy in any project. Is there a solution to this?
– xor
Sep 16 '15 at 13:06
1
That's great! I ke...
filename and line number of python script
..., '__rpow__', '__rrshift__', '__rshift__', '__rsub__', '__rtruediv__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__truediv__', '__trunc__', '__xor__', 'bit_length', 'conjugate', 'denominator', 'imag', 'numerator', 'real']
14
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How to get elements with multiple classes
...ast one class)
var list = document.querySelectorAll(".class1,.class2");
XOR (one class but not the other)
var list = document.querySelectorAll(".class1:not(.class2),.class2:not(.class1)");
NAND (not both classes)
var list = document.querySelectorAll(":not(.class1),:not(.class2)");
NOR (not ...
C# int to byte[]
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The array initializer and the xor (^) and & 0xFF bits are unnecessary.
– dtb
Aug 23 '09 at 16:42
6
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How to remove an item for a OR'd enum?
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What about xor(^)?
Given that the FLAG you are trying to remove is there, it will work.. if not, you will have to use an &.
public enum Colour
{
None = 0, // default value
RED = 2,
BLUE = 4,
GREEN = 8,
YELLOW ...
Move all files except one
...iano Very cool command! Are there more mathematical operations like OR and XOR? I assume a pipe is for AND.
– Léo Léopold Hertz 준영
Mar 22 '09 at 3:39
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