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What does ** (double star/asterisk) and * (star/asterisk) do for parameters?
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The single * means that there can be any number of extra positional arguments. foo() can be invoked like foo(1,2,3,4,5). In the body of foo() param2 is a sequence containing 2-5.
The double ** means there can be any number of extra named parameters. bar() can be invoked like...
When to use volatile with multi threading?
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...matter if the other threads do an extra few iterations of their work loops before they terminate, as long as it happens reasonably soon after the flag is set. Of course, this is the ONLY use that I can think of and its rather niche (and may not work on platfo...
What is the difference between Flex/Lex and Yacc/Bison?
...that.
Yacc and Bison are pretty closely compatible, though Bison has some extra tricks it can do.
You probably can't find legitimate copies of (the original, AT&T versions of) Lex and Yacc to install on Ubuntu. I wouldn't necessarily say it is impossible, but I'm not aware of such. Flex and ...
Android: how to make keyboard enter button say “Search” and handle its click?
..."match_parent"
android:layout_height="wrap_content"
android:hint="@string/search"
android:imeOptions="actionSearch"
android:inputType="text"
android:maxLines="1" />
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i...
overlay two images in android to set an imageview
...= DEFAULT_IMAGE_SIZE * 2, MAX_HEIGHT = DEFAULT_IMAGE_SIZE * 2;
private String picassoRequestTag = null;
public MergeImageView(Context context) {
super(context);
}
public MergeImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public M...
How can I find the last element in a List?
...on, how to address the last element of a List safely...
Assuming
List<string> myList = new List<string>();
Then
//NOT safe on an empty list!
string myString = myList[myList.Count -1];
//equivalent to the above line when Count is 0, bad index
string otherString = myList[-1];
"coun...
How can I quickly sum all numbers in a file?
...hat shows a deep understanding on what code -nle actually wraps around the string you give it. My initial thought was that you shouldn't post while intoxicated but then I noticed who you were and remembered some of your other Perl answers :-)
– paxdiablo
Apr 23...
push_back vs emplace_back
...::map<int, Complicated> m;
int anInt = 4;
double aDouble = 5.0;
std::string aString = "C++";
// cross your finger so that the optimizer is really good
m.insert(std::make_pair(4, Complicated(anInt, aDouble, aString)));
// should be easier for the optimizer
m.emplace(4, anInt, aDouble, aStrin...
What type of hash does WordPress use?
..., so you can have many types of hashes with different salts and feeds that string into a function that knows how to match it with some other value.
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Send string to stdin
... use a bash alias, you just use the form command_alias <<< "stdin string", otherwise it will say command not found
– Pyrolistical
Feb 12 '14 at 17:26
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