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How to get the first element of an array?
...rtant thing to know is that the two above are only an option if your array starts with a [0] index.
There are cases where the first element has been deleted, example with, delete yourArray[0] leaving your array with "holes". Now the element at [0] is simply undefined, but you want to get the first ...
How do you search an amazon s3 bucket?
... crazy simple:
open the bucket, select "none" on the right hand side, and start typing in the file name.
http://docs.aws.amazon.com/AmazonS3/latest/UG/ListingObjectsinaBucket.html
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Restoring MySQL database from physical files
...c location, then I copy those to corresponding location, exactly.
Step 7: Start your Mysql server. Everything come back and enjoy it.
That is it.
See more info at: https://biolinh.wordpress.com/2017/04/01/restoring-mysql-database-from-physical-files-debianubuntu/
...
Best way to extract a subvector from a vector?
...ays, we use spans! So you would write:
#include <gsl/span>
...
auto start_pos = 100000;
auto length = 1000;
auto span_of_myvec = gsl::make_span(myvec);
auto my_subspan = span_of_myvec.subspan(start_pos, length);
to get a span of 1000 elements of the same type as myvec's. Or a more terse form...
How to set Java environment path in Ubuntu
...e and then do the following:
Assuming you are using bash (if you are just starting off, i recommend bash over other shells) you can simply type in bash to start it.
Edit your ~/.bashrc file and add the paths as follows:
for eg. vi ~/.bashrc
insert following lines:
export JAVA_HOME=/usr/java/<...
WebRTC vs Websockets: If WebRTC can do Video, Audio, and Data, why do I need Websockets? [closed]
... signaling.
I maintain a list of WebRTC resources: strongly recommend you start by looking at the 2013 Google I/O presentation about WebRTC.
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Cannot refer to a non-final variable inside an inner class defined in a different method
...ence where the String object "hello" lives in heap
}
}.start();
// change the reference 'shared' points to, with a new value
shared = "other hello";
System.out.println(shared);
}
}
That won't work, because this is what the compiler does under the h...
What's the easiest way to install a missing Perl module?
...
On Unix:
usually you start cpan in your shell:
# cpan
and type
install Chocolate::Belgian
or in short form:
cpan Chocolate::Belgian
On Windows:
If you're using ActivePerl on Windows, the PPM (Perl Package Manager) has much of the same f...
What is “2's Complement”?
... binary.
It basically says,
for zero, use all 0's.
for positive integers, start counting up, with a maximum of 2(number of bits - 1)-1.
for negative integers, do exactly the same thing, but switch the role of 0's and 1's (so instead of starting with 0000, start with 1111 - that's the "complement" p...
What is the difference between URI, URL and URN? [duplicate]
... (A relative URL, only useful in the context of another URL)
URLs always start with a protocol (http) and usually contain information such as the network host name (example.com) and often a document path (/foo/mypage.html). URLs may have query parameters and fragment identifiers.
URN -- Uniform R...