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What does it mean for a data structure to be “intrusive”?
...sive data structure would be an ordered list of elements that are mutable. If the element changes, the list needs to be reordered, so the list object has to intrude on the privacy of the elements in order to get their cooperation. ie. the element has to know about the list it is in, and inform it of...
*.h or *.hpp for your class definitions
...
Here are a couple of reasons for having different naming of C vs C++ headers:
Automatic code formatting, you might have different guidelines for formatting C and C++ code. If the headers are separated by extension you can set your editor to apply the appropriate f...
mkdir's “-p” option
...ertips: man mkdir yields this about -p switch:
-p, --parents
no error if existing, make parent directories as needed
Use case example: Assume I want to create directories hello/goodbye but none exist:
$mkdir hello/goodbye
mkdir:cannot create directory 'hello/goodbye': No such file or directo...
PostgreSQL Connection URL
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If you use Libpq binding for respective language, according to its documentation URI is formed as follows:
postgresql://[user[:password]@][netloc][:port][/dbname][?param1=value1&...]
Here are examples from same documen...
Appending to an empty DataFrame in Pandas?
...But the append doesn't happen in-place, so you'll have to store the output if you want it:
>>> df
Empty DataFrame
Columns: []
Index: []
>>> df = df.append(data)
>>> df
A
0 0
1 1
2 2
share
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What is the best regular expression to check if a string is a valid URL?
How can I check if a given string is a valid URL address?
55 Answers
55
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Exactly what is a “third party”? (And who are the first and second party?)
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If you are developing software for a client, then there is a contract between you/your company, and the client/their company. These are the two parties to the contract. Anyone else, not bound by the contract, is a third party...
How can I count occurrences with groupBy?
... you're just looking for the overload which takes another Collector to specify what to do with each group... and then Collectors.counting() to do the counting:
import java.util.*;
import java.util.stream.*;
class Test {
public static void main(String[] args) {
List<String> list =...
How can I give the Intellij compiler more heap space?
... I know this is slightly off-topic but might save someone some hair if they come across this. I was having the same problem, but mine stemmed from when I was doing a mvn install in IntelliJ. The solution was to modify the Settings | Maven | Runner | **VM Options** I must have tried every o...
CSS: Set a background color which is 50% of the width of the window
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Older Browser Support
If older browser support is a must, so you can't go with multiple backgrounds or gradients, you're probably going to want to do something like this on a spare div element:
#background {
position: fixed;
top: 0;
l...