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Saving an Object (Data persistence)
... to show how more than one object could be saved into (and later read back from) the same file.
– martineau
Dec 25 '10 at 9:57
1
...
What is the difference between association, aggregation and composition?
...r bar = new Bar();
}
Aggregation - I have an object which I've borrowed from someone else. When Foo dies, Bar may live on.
public class Foo {
private Bar bar;
Foo(Bar bar) {
this.bar = bar;
}
}
s...
What's the rationale for null terminated strings?
...
From the horse's mouth
None of BCPL, B, or C supports
character data strongly in the
language; each treats strings much
like vectors of integers and
supplements general rules by a few
conventions. In both BCP...
Why do we need a pure virtual destructor in C++?
...e language and there's no need for this rule since no ill-effects can come from allowing a pure virtual destructor.
Nope, plain old virtual is enough.
If you create an object with default implementations for its virtual methods and want to make it abstract without forcing anyone to override any s...
How to determine SSL cert expiration date from a PEM encoded certificate?
...tainer, your expiry_date value will need to have the timezone name removed from the end of it. Add an additional cut to the end of the pipe to do this: | cut -d ' ' -f 1-4
– Droogans
Feb 28 at 10:13
...
Differences between git pull origin master & git pull origin/master
...
git pull origin master will pull changes from the origin remote, master branch and merge them to the local checked-out branch.
git pull origin/master will pull changes from the locally stored branch origin/master and merge that to the local checked-out branch. The ...
How to install psycopg2 with “pip” on Python?
...
Option 2
Install the prerequsisites for building the psycopg2 package from source:
Debian/Ubuntu
Python 3
sudo apt install libpq-dev python3-dev
You might need to install python3.8-dev or similar for e.g. Python 3.8.
Python 21
sudo apt install libpq-dev python-dev
If that's not enough,...
Django REST framework: non-model serializer
...f __init__(self, *args, **kw):
# Initialize any variables you need from the input you get
pass
def do_work(self):
# Do some calculations here
# returns a tuple ((1,2,3, ), (4,5,6,))
result = ((1,2,3, ), (4,5,6,)) # final result
return result
The...
Why does sudo change the PATH?
...
This "annoying function" prevents you from getting trojaned. I say forcing a specific $PATH is a feature, not a bug---it makes you write out the full path to a program that's outside the $PATH.
– Chris Jester-Young
May 18 '0...
Deploying website: 500 - Internal server error
...articles.
Also, this can help: How to enable the detailed error messages (from IIS).
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