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Is there a way to create multiline comments in Python?
... elif token == '\\or':
do_something_else()
elif token == '\\xor':
'''
Note that we still need to provide support for the deprecated
token \xor. Hopefully we can drop support in libfoo 2.0.
'''
do_a_different_thing()
else:
raise Valu...
How to swap two variables in JavaScript
... swap without using a third variable. For instance you can use the bitwise xor operator:
let a = 1, b = 2;
a = a ^ b;
b = a ^ b;
a = a ^ b;
console.log('a is now:', a);
console.log('b is now:', b);
This is called the XOR swap algorithm. Its theory of operation is described in ...
Ternary operator is twice as slow as an if-else block?
...32: foreach (int i in array)
0000007c 33 D2 xor edx,edx
0000007e 83 7E 04 00 cmp dword ptr [esi+4],0
00000082 7E 1C jle 000000A0
00000084 8B 44 96 08 mov eax,dword ptr [esi+edx*4+8]
33: ...
What is Bit Masking?
...ue
Bitwise ORing in order to set a subset of the bits in the value
Bitwise XORing in order to toggle a subset of the bits in the value
Below is an example of extracting a subset of the bits in the value:
Mask: 00001111b
Value: 01010101b
Applying the mask to the value means that we want to cl...
Sort points in clockwise order?
... xmm4, xmm0, xmm2
vmovss xmm0, DWORD PTR [edx+4]
push ebx
xor ebx, ebx
vxorps xmm3, xmm3, xmm3
vcomiss xmm4, xmm3
vsubss xmm5, xmm0, xmm1
seta bl
xor ecx, ecx
vcomiss xmm5, xmm3
push esi
seta cl
; 30 : const int qa = (1 - dax) + (1 - ...
c/c++如何获取CPU的序列号？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...-----";
char CPUSERIAL[20];
memset(CPUSERIAL,0,20);
__asm{
xor eax,eax
cpuid
mov dword ptr vendor_id,ebx
mov dword ptr vendor_id[+4],edx
mov dword ptr vendor_id[+8],ecx
}
__asm{
mov eax,01h
xor edx,edx
cpuid
mov s1,edx
...
What does value & 0xff do in Java?
... ;//(.....000110)
onWhichThisHasTobeReSet &= thirdBitTobeReSet;
XOR
Just note that if you perform XOR operation twice, will results the same value.
byte toBeEncrypted = 0010 0110
byte salt = 0100 1011
byte encryptedVal = toBeEncrypted ^ salt == 0110 1101
byte decryptedV...
How to encrypt String in Java
...ret key can be easily recovered by an attacker using 2 encrypted messages. XOR 2 encrypted messages and you get the key. That simple!
Pointed out by Moussa
I am using Sun's Base64Encoder/Decoder which is to be found in Sun's JRE, to avoid yet another JAR in lib. That's dangerous from point of usin...
Random row from Linq to Sql
...Shuffle & seed)) & (s.Shuffle | seed)); // ^ seed);
This does an XOR operation in the database and orders by the results of that XOR.
Advantages:-
Efficient: SQL handles the
ordering, no need to fetch the whole
table
Repeatable: (good for
testing) - can use the same random
seed to gener...
How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
... 83 ec 08 sub $0x8,%rsp
4: 31 ff xor %edi,%edi
6: e8 00 00 00 00 callq b <main+0xb>
7: R_X86_64_PC32 time-0x4
b: 48 85 c0 test %rax,%rax
e: 75 14 jne ...