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Timer function to provide time in nano seconds using C++
....h>
#include <iostream>
using namespace std;
int main (int argc, char** argv)
{
// reset the clock
timespec tS;
tS.tv_sec = 0;
tS.tv_nsec = 0;
clock_settime(CLOCK_PROCESS_CPUTIME_ID, &tS);
...
... <code to check for the time to be put here>
...
...
psycopg2: insert multiple rows with one query
... 3, cursor.mogrify() returns bytes, cursor.execute() takes either bytes or strings, and ','.join() expects str instance.
So in Python 3 you may need to modify @ant32 's code, by adding .decode('utf-8'):
args_str = ','.join(cur.mogrify("(%s,%s,%s,%s,%s,%s,%s,%s,%s)", x).decode('utf-8') for x in tup...
Good Hash Function for Strings
I'm trying to think up a good hash function for strings. And I was thinking it might be a good idea to sum up the unicode values for the first five characters in the string (assuming it has five, otherwise stop where it ends). Would that be a good idea, or is it a bad one?
...
Ways to implement data versioning in MongoDB
...Mongoid has built in simple versioning
http://mongoid.org/en/mongoid/docs/extras.html#versioning
mongoid-history is a Ruby plugin that provides a significantly more complicated solution with auditing, undo and redo
https://github.com/aq1018/mongoid-history
...
Literal suffix for byte in .NET?
...t
does 0xFFB mean?) and even if we had a solution for that, or another
character than 'B' ('Y' was considered, F# uses this) no one could
remember whether the default was signed or unsigned - .NET bytes are
unsigned by default so it would make sense to pick B and SB but all
the other suffi...
Safely limiting Ansible playbooks to a single machine?
...ok's hosts using a variable, then passing in a specific host address via --extra-vars:
# file: user.yml (playbook)
---
- hosts: '{{ target }}'
user: ...
Running the playbook:
ansible-playbook user.yml --extra-vars "target=imac-2.local"
If {{ target }} isn't defined, the playbook does nothin...
How to change letter spacing in a Textview?
...ntent.Context;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.ScaleXSpan;
import android.util.AttributeSet;
import android.widget.TextView;
public class LetterSpacingTextView extends TextView {
private float letterSpacing = LetterSpacing.BIGGEST;
...
How can I pass a Bitmap object from one activity to another
...mple code.
To store bitmap in a file myImage in internal storage:
public String createImageFromBitmap(Bitmap bitmap) {
String fileName = "myImage";//no .png or .jpg needed
try {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat...
Calculating arithmetic mean (one type of average) in Python
...tinuous integration systems like Travis CI, installing numpy takes several extra minutes. If quick and light build is valuable to you, and you need only the mean, consider.
– Akseli Palén
Mar 7 '16 at 11:36
...
What is the difference between a reference type and value type in c#?
...gregated into "class, struct, enum, delegate, interface". int is a struct, string is a class, Action is a delegate, etc. Your list of "int, bool, float, class, interface, delegate" is a list containing difference kinds of things, in the same way that "10, int" is a list containing different kinds of...