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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...
Custom domain for GitHub project pages
...these are the A records to create:
185.199.108.153
185.199.109.153
185.199.110.153
185.199.111.153
Check the Github docs to confirm these are the most up-to-date IPs.
Create a CNAME record to point www.example.com to YOUR-GITHUB-USERNAME.github.io.
This is the most confusing part.
Note the YOUR-G...
How to check SQL Server version
...ROM sys.databases WHERE database_id=DB_ID() AND [compatibility_level] < 110)
RAISERROR('Database compatibility level must be SQL2008R2 or later (110)!', 16, 1)
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Why is printing to stdout so slow? Can it be sped up?
...
print : 0.261 s
write to file (+fsync) : 0.110 s
print with stdout = /dev/null : 0.050 s
0.26s is MUCH better than 12s! I don't know whether wterm is more intelligent about how it renders to screen along the lines of how I was suggesting (render the 'visible' tail ...
Unicode与UTF-8互转(C语言实现) - C/C++ - 清泛网 - 专注C/C++及内核技术
...unicode是十六进制数4E25, 转换成二进制数足足有15位
(100111000100101), 也就是说这个符号的表示至少需要2个字节. 表示其他更大的符号,
可能需要3个字节或者4个字节, 甚至更多.
这里就有两个严重的问题, 第一个问题是, 如何才能...
What are the differences between Rust's `String` and `str`?
...ally, what used to be ~str is now Box<str>
– jv110
Apr 18 '18 at 17:41
4
@jv110: no, becaus...
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
...
linux下iptables配置详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...-A INPUT -p tcp --dport 80 -j ACCEPT
如果做了邮件服务器,开启25,110端口.
[root@tp ~]# iptables -A INPUT -p tcp --dport 110 -j ACCEPT
[root@tp ~]# iptables -A INPUT -p tcp --dport 25 -j ACCEPT
如果做了FTP服务器,开启21端口
[root@tp ~]# iptables -A INPUT -p tcp --dport 21 -j...
Possible reason for NGINX 499 error codes
... happening in my case is that nginx would error.log an upstream timed out (110: Connection timed out) while reading upstream and then nginx retries "the next proxy server in the backend server group you configured." That's if you have more than one.
Then it tries the next and next till (by default)...
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...