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What is a regular expression for a MAC Address?
...2})$/i
or
/^([0-9a-F]{1,2}[\.:-]){5}([0-9a-F]{1,2})$/
exm: 00:27:0e:2a:b9:aa, 00-27-0E-2A-B9-AA, 0.27.e.2a.b9.aa ...
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Compile time string hashing
...space my_hash::literals;
void one() {} void two() {} void other() {}
void foo( const std::string& value )
{
switch( my_hash::hash(value) )
{
case "one"_hash: one(); break;
case "two"_hash: two(); break;
/*many more cases*/
default: other(); break;
}
}
live example.
Note...
苹果第三财季大中华区营收132.3亿美元 同比增长112% - 资讯 - 清泛网 - 专...
...营业利润为140.83亿美元，较去年同期的102.82亿美元增长36.9%；
——总营业费用为55.98亿美元，较去年同期的44.53亿美元增长25.7%；
——净利润为106.77亿美元，较去年同期的77.48亿美元增长37.8%；
——每股摊薄收益为1.85美元，较...
What's the difference between passing by reference vs. passing by value?
...here's an example in some C-like language of a function declaration:
void foo(int param) { // line 1
param += 1;
}
And here's an example of calling this function:
void bar() {
int arg = 1; // line 2
foo(arg); // line 3
}
Using this example, I want to define some important bits of t...
Array include any value from another array?
...de? was the fastest, set disjoint the slowest: gist.github.com/jaredmoody/d2a1e83de2f91fd6865920cd01a8b497
– Jared
May 3 '17 at 17:25
4
...
How to fix Git error: object file is empty?
...1 pointer in cache-tree
dangling blob 03511c9868b5dbac4ef1343956776ac508c7c2a2
missing blob 8b61d0135d3195966b443f6c73fb68466264c68e
missing blob e89896b1282fbae6cf046bf21b62dd275aaa32f4
dangling blob dd09f7f1f033632b7ef90876d6802f5b5fede79a
missing blob caab8e3d18f2b8c8947f79af7885cdeeeae192fd
miss...
How can I recursively find all files in current and subfolders based on wildcard matching?
...
Use find for that:
find . -name "foo*"
find needs a starting point, and the . (dot) points to the current directory.
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...
Hash function that produces short hashes?
...
unique_id = uuid.uuid4()
# unique_id = UUID('8da617a7-0bd6-4cce-ae49-5d31f2a5a35f')
hash = hashlib.sha1(str(unique_id).encode("UTF-8"))
# hash.hexdigest() = '882efb0f24a03938e5898aa6b69df2038a2c3f0e'
result = base64.b64encode(hash.digest())
# result = b'iC77DySgOTjliYqmtp3yA4osPw4='
The result ...
Node.js get file extension
...ount: 0,
_maxListeners: undefined,
size: 1047621,
path: '/tmp/upload_2a4ac9ef22f7156180d369162ef08cb8',
name: 'blob',
**type: 'image/png'**,
hash: null,
lastModifiedDate: Wed Jul 20 2016 16:12:21 GMT+0300 (EEST),
_writeStream:
WriteStream {
... },
writable: true,
doma...
Why does Java switch on contiguous ints appear to run faster with added cases?
...cf: pop rbp
0x00000000024f01d0: test DWORD PTR [rip+0xfffffffffdf3fe2a],eax # 0x0000000000430000
; {poll_return}
0x00000000024f01d6: ret
With 18 cases, the assembly looks like this (notice the array of pointers which is used and...