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What is the __del__ method, How to call it?
...__ is a finalizer. It is called when an object is garbage collected which happens at some point after all references to the object have been deleted.
In a simple case this could be right after you say del x or, if x is a local variable, after the function ends. In particular, unless there are circ...
Measure time in Linux - time vs clock vs getrusage vs clock_gettime vs gettimeofday vs timespec_get?
...s indeed 1 µs. This clock wraps around once it tops out (this typically happens after ~2^32 ticks, which is not very long for a 1 MHz clock). man clock says that since glibc 2.18 it is implemented with clock_gettime(CLOCK_PROCESS_CPUTIME_ID, ...) in Linux.
clock_gettime(CLOCK_MONOTONIC, ...) prov...
Difference between DateTime and Time in Ruby
...value describing the number of seconds since January 1, 1970 UTC, a thin wrapper around a POSIX-standard time_t value, and is bounded:
Time.at(0x7FFFFFFF)
# => Mon Jan 18 22:14:07 -0500 2038
Time.at(-0x7FFFFFFF)
# => Fri Dec 13 15:45:53 -0500 1901
Newer versions of Ruby are able to handle l...
What's the purpose of using braces (i.e. {}) for a single-line if or loop?
... described. There are some benefits. But, IMO, "always" rules don't always apply. So I don't wholly support
Always use a { } block - even for a single line // not OK, why ???
I'm not saying always use a {} block. If it's a simple enough condition & behavior, don't. If you suspect someone m...
Left Align Cells in UICollectionView
...iple cells of differing widths on a line. According to:
https://developer.apple.com/library/content/documentation/WindowsViews/Conceptual/CollectionViewPGforIOS/UsingtheFlowLayout/UsingtheFlowLayout.html
...
Using .NET, how can you find the mime type of a file based on the file signature not the extension
...ype detection, or "data sniffing," refers to the process of determining an appropriate MIME type from binary data. The final result depends on a combination of server-supplied MIME type headers, file extension, and/or the data itself. Usually, only the first 256 bytes of data are significant.
So,...
What is the difference between the states selected, checked and activated in Android?
...ld).setChecked(mCheckStates.get(position));
} else if (getContext().getApplicationInfo().targetSdkVersion
>= android.os.Build.VERSION_CODES.HONEYCOMB) {
child.setActivated(mCheckStates.get(position));
}
}
Note the mCheckStates variable. It keeps track of which positi...
Framework vs. Toolkit vs. Library [duplicate]
...the things they can do without you asking is owning the control flow of an application. I think @Sridhar-Sarnobat's answer is probably better
– neuron
Apr 5 '16 at 16:27
add a...
How do you Encrypt and Decrypt a PHP String?
...et a 16, 24, or 32 character random string in the
key option of the config/app.php file. Otherwise, encrypted values
will not be secure.
When to use EntityManager.find() vs EntityManager.getReference() with JPA
...
@Arthur Ronald what happens if there is a Version annotation in the entity called by getReference?
– David Hofmann
Mar 25 '16 at 13:28
...