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Check status of one port on remote host [closed]
I need a command line that can check the port status on a remote host. I tried ping xxx.xxx.xxx.xxx:161 but it doesn't recognize the "host". I thought it was a "good" answer until I did the same command against a host I know has that port open. This is for a batch file on Windows that will chec...
Function Pointers in Java
This may be something common and trivial, but I seem to be having trouble finding a concrete answer. In C# there is a concept of delegates, which relates strongly to the idea of function pointers from C++. Is there a similar functionality in Java? Given that pointers are somewhat absent, what is the...
What are transparent comparators?
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What problem does this solve,
See Dietmar's answer and remyabel's answer.
and does this change how standard containers work?
No, not by default.
The new member function template overloads of find etc. allow you to use a type that is comparable with the container's key,...
How can I check if a command exists in a shell script? [duplicate]
...my first shell script. In my script I would like to check if a certain command exists, and if not, install the executable. How would I check if this command exists?
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get dictionary key by value
...types.FirstOrDefault(x => x.Value == "one").Key;
If values are unique and are inserted less frequently than read, then create an inverse dictionary where values are keys and keys are values.
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Check if a string has white space
...ces.
$ matches the end of the string.
Try replacing the regex with /\s/ (and no quotes)
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How to remove duplicate white spaces in string using Java?
...atches a space, tab, new line, carriage return, form feed or vertical tab, and + says "one or more of those". Thus the above code will collapse all "whitespace substrings" longer than one character, with a single space character.
Source: Java: Removing duplicate white spaces in strings
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Inserting multiple rows in a single SQL query? [duplicate]
... to insert at once, say 4 rows. My table has three columns: Person , Id and Office .
4 Answers
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How to convert a scala.List to a java.util.List?
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Scala List and Java List are two different beasts, because the former is immutable and the latter is mutable. So, to get from one to another, you first have to convert the Scala List into a mutable collection.
On Scala 2.7:
import sca...
How do I call ::std::make_shared on a class with only protected or private constructors?
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This answer is probably better, and the one I'll likely accept. But I also came up with a method that's uglier, but does still let everything still be inline and doesn't require a derived class:
#include <memory>
#include <string>
class A {
p...