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Java HashMap performance optimization / alternative
...or every object:
public int hashCode() {
// assume that both a and b are sorted
return a[0] + powerOf52(a[1], 1) + powerOf52(b[0], 2) + powerOf52(b[1], 3) + powerOf52(b[2], 4);
}
public static int powerOf52(byte b, int power) {
int result = b;
for (int i = 0; i < p...
How to create a shared library with cmake?
...um_required(VERSION 3.9)
You should declare a project. cmake says it is mandatory and it will define convenient variables PROJECT_NAME, PROJECT_VERSION and PROJECT_DESCRIPTION (this latter variable necessitate cmake 3.9):
project(mylib VERSION 1.0.1 DESCRIPTION "mylib description")
Declare a ne...
Pandas: Setting no. of max rows
...max_rows:
pd.set_option('display.max_rows', 500)
For older versions of pandas (<=0.11.0) you need to change both display.height and display.max_rows.
pd.set_option('display.height', 500)
pd.set_option('display.max_rows', 500)
See also pd.describe_option('display').
You can set an option on...
What's the simplest way to subtract a month from a date in Python?
...// 12
if not m: m = 12
d = min(date.day, [31,
29 if y%4==0 and (not y%100==0 or y%400 == 0) else 28,
31,30,31,30,31,31,30,31,30,31][m-1])
return date.replace(day=d,month=m, year=y)
>>> for m in range(-12, 12):
print(monthdelta(datetime.now(), m))
2009-...
iOS 7 - How to display a date picker in place in a table view?
...uggests displaying picker in place in a table view in iOS 7. How to insert and animate a view between table view cells?
13 ...
Parse v. TryParse
What is the difference between Parse() and TryParse()?
8 Answers
8
...
Difference between setUp() and setUpBeforeClass()
When unit testing with JUnit, there are two similar methods, setUp() and setUpBeforeClass() . What is the difference between these methods? Also, what is the difference between tearDown() and tearDownAfterClass() ?
...
Difference between author and committer in Git?
... is the person who originally wrote the code. The committer, on the other hand, is assumed to be the person who committed the code on behalf of the original author. This is important in Git because Git allows you to rewrite history, or apply patches on behalf of another person. The FREE online Pro G...
Is there a difference between “raise exception()” and “raise exception” without parenthesis?
...
The short answer is that both raise MyException and raise MyException() do the same thing. This first form auto instantiates your exception.
The relevant section from the docs says, "raise evaluates the first expression as the exception object. It must be either a subcla...
Do using statements and await keywords play nicely in c#
...ave a situation where I am making an async call to a method that returns and IDisposable instance. For example:
1 Answe...