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C++ unordered_map using a custom class type as the key
...arting point for a hash function is one that uses bit shifting and bitwise XOR to combine the individual hash values. For example, assuming a key-type like this:
struct Key
{
std::string first;
std::string second;
int third;
bool operator==(const Key &other) const
{ return (f...
How do function pointers in C work?
... mov ebx,DWORD PTR [ebx]
c: 31 c3 xor ebx,eax # pointless xor-swap
e: 31 d8 xor eax,ebx # instead of just storing with opposite registers
10: 31 c3 xor ebx,eax
12: 8b 4c 2...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...,8), %rbp
addq $4, %rdx
# Reuse "rax" for all the popcnts.
xor %rax, %rax # Break the cross-iteration dependency by zeroing "rax".
popcnt %r9, %rax
add %rax, %rcx
popcnt %r10, %rax
add %rax, %rsi
popcnt %r11, %rax
add %rax, %r8
popcnt %rbp, ...
Fastest hash for non-cryptographic uses?
...33be207f14eeab8b
sha1: 0.07331 417a9e5c9ac7c52e32727cfd25da99eca9339a80
xor: 0.65218 119
xor2: 0.29301 134217728
add: 0.57841 1105
And the code used to generate this is:
$loops = 100000;
$str = "ana are mere";
echo "<pre>";
$tss = microtime(true);
for($i=0; $i<$loop...
Swapping column values in MySQL
...ng the left-to-right evaluation process in MySQL.
Alternatively, just use XOR if they're numbers. You mentioned coordinates, so do you have lovely integer values, or complex strings?
Edit: The XOR stuff works like this by the way:
update swapper set foo = foo ^ bar, bar = foo ^ bar, foo = foo ^ b...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...主要通过BCH Code来计算
然后15个bits还要与101010000010010做XOR操作。这样就保证不会因为我们选用了00的纠错级别和000的Mask，从而造成全部为白色，这会增加我们的扫描器的图像识别的困难。
下面是一个示例：
关于Error Correctio...
How to simplify a null-safe compareTo() implementation?
...
Sweet use of XOR
– James McMahon
Mar 30 '12 at 18:53
9
...
Background color of text in SVG
...od-color="yellow"/>
<feComposite in="SourceGraphic" operator="xor" />
</filter>
</defs>
<text filter="url(#solid)" x="20" y="50" font-size="50">solid background</text>
</svg>
...
How did I get a value larger than 8 bits in size from an 8-bit integer?
...
The assembler code reveals the problem:
:loop
mov esi, ebx
xor eax, eax
mov edi, OFFSET FLAT:.LC2 ;"c: %i\n"
sub ebx, 1
call printf
cmp ebx, -301
jne loop
mov esi, -45
mov edi, OFFSET FLAT:.LC2 ;"c: %i\n"
xor eax, eax
call printf
EBX should be anded with FF post decremen...
Cleanest way to toggle a boolean variable in Java?
... search terms. The code above doesn't. For those who need it, it's bitwise XOR as described here.
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