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Ruby custom error classes: inheritance of the message attribute
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Given what the ruby core documentation of Exception, from which all other errors inherit, states about #message
Returns the result of invoking exception.to_s. Normally this returns
the exception’s message or name. By supplying a to_str method,
exceptions are agreeing to be used ...
What is the purpose of Android's tag in XML layouts?
...xtView />
<TextView />
</FrameLayout>
which is functionally equivalent to this single layout:
<FrameLayout>
<FrameLayout>
<TextView />
<TextView />
</FrameLayout>
</FrameLayout>
That FrameLayout in layout2.xml may not be us...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...hyay, D., & Sen, J. (2011). Internet of things: Applications and challenges in technology and standardization. Wireless Personal Communications, 58(1), 4969.
[2] Wolber, D., Abelson, H., Spertus, E., & Looney, L. (2011). App Inventor. ” O’Reilly Media, Inc.”.
[3] Macke...
How to read a text file reversely with iterator in C#
...o process from bottom up. How can I use iterator (yield return) here? Basically I don't like to load everything in memory. I know it is more efficient to use iterator in .NET.
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What is the difference between :first-child and :first-of-type?
...first child of the parent. So far the child elements we're looking at have all been divs, but bear with me, I'll get to that in a bit.
For now, the converse also holds true: any :first-child is also :first-of-type by necessity. Since the first child here is also the first div, it will match both ps...
best practice to generate random token for forgot password
...d reminder token, and, if it is a one-time login credentials, then you actually have a data to protect (which is - whole user account)
So, the code will be as follows:
//$length = 78 etc
$token = bin2hex(random_bytes($length));
Update: previous versions of this answer was referring to uniqid()...
Choice between vector::resize() and vector::reserve()
I am pre-allocating some memory to my a vector member variable. Below code is minimal part
4 Answers
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RRSet of type CNAME with DNS name foo.com. is not permitted at apex in zone bar.com
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As per RFC1912 section 2.4:
A CNAME record is not allowed to coexist with any other data. In
other words, if suzy.podunk.xx is an alias for sue.podunk.xx, you
can't also have an MX record for suzy.podunk.edu, or an A record, or
even a TXT record. Especially do not try t...
how do I initialize a float to its max/min value?
...t;algorithm>) which may be a better choice for finding the largest or smallest value in an array.
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START_STICKY and START_NOT_STICKY
...TICKY tells the OS to recreate the service after it has enough memory and call onStartCommand() again with a null intent. START_NOT_STICKY tells the OS to not bother recreating the service again. There is also a third code START_REDELIVER_INTENT that tells the OS to recreate the service and redeliv...