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What is the meaning of “__attribute__((packed, aligned(4))) ”
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Before answering, I would like to give you some data from Wiki
Data structure alignment is the way data is arranged and accessed in computer memory. It consists of two separate but related issues: data alignment and data structure padding.
When a modern computer reads from ...
How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?
...nd. I did as above and it worked. I then unplugged my (FTDI) serial device from the USB and afterwards it produced the error that you described.
– Warpspace
Jan 29 '19 at 8:30
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Working Soap client example
...id main(String args[]) {
/*
The example below requests from the Web Service at:
http://www.webservicex.net/uszip.asmx?op=GetInfoByCity
To call other WS, change the parameters below, which are:
- the SOAP Endpoint URL (that is, where the ser...
Exit a Script On Error
...ands' error codes cause an automatic exit. Furthermore, "the rules change from one Bash version to another, as Bash attempts to track the extremely slippery POSIX definition of this 'feature'". I agree with @Dennis Williamson and the accepted answer of stackoverflow.com/questions/19622198/… - us...
When is memoization automatic in GHC Haskell?
...new version is much less efficient because it will have to read about 1 GB from memory where y is stored, while the original version would run in constant space and fit in the processor's cache. In fact, under GHC 6.12.1, the function f is almost twice as fast when compiled without optimizations th...
How to get the tag HTML with JavaScript / jQuery?
...t.querySelector("html");
And if you want to use jQuery to get attributes from it...
$(htmlElement).attr(INSERT-ATTRIBUTE-NAME);
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Is the order of elements in a JSON list preserved?
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Yes, the order of elements in JSON arrays is preserved. From RFC 7159 -The JavaScript Object Notation (JSON) Data Interchange Format
(emphasis mine):
An object is an unordered collection of zero or more name/value
pairs, where a name is a string and a value is a string, num...
__lt__ instead of __cmp__
...other<self
Now your class can define just __lt__ and multiply inherit from ComparableMixin (after whatever other bases it needs, if any). A class decorator would be quite similar, just inserting similar functions as attributes of the new class it's decorating (the result might be microscopicall...
How do I discover memory usage of my application in Android?
...of little use, since the Java heap limit is there in part to avoid one app from being able to stress the system to this point.
Going lower-level, you can use the Debug API to get raw kernel-level information about memory usage: android.os.Debug.MemoryInfo
Note starting with 2.0 there is also an AP...
Initialize parent's protected members with initialization list (C++)
...e base class). This causes the something member to be default initialized.
From C++0x draft:
12.6.2 Initializing bases and members
2 Names in a mem-initializer-id are
looked up in the scope of the
constructor’s class and, if not found
in that scope, are looked up in the
scope containing the const...