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Push Notifications in Android Platform
I am looking to write an app that receives pushed alerts from a server. I found a couple of methods to do this.
20 Answer...
Why use static_cast(x) instead of (int)x?
I've heard that the static_cast function should be preferred to C-style or simple function-style casting. Is this true? Why?
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Why does Math.round(0.49999999999999994) return 1?
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Should functions return null or an empty object?
What is the best practice when returning data from functions. Is it better to return a Null or an empty object? And why should one do one over the other?
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Does the C++ standard mandate poor performance for iostreams, or am I just dealing with a poor imple
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How can I use numpy.correlate to do autocorrelation?
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To answer your first question, numpy.correlate(a, v, mode) is performing the convolution of a with the reverse of v and giving the results clipped by the specified mode. The definition of convolution, C(t)=∑ -∞ < i < ∞ aivt+i where -∞ < t &l...
How can I hash a password in Java?
...ls(saltAndHash[1]);
}
// using PBKDF2 from Sun, an alternative is https://github.com/wg/scrypt
// cf. http://www.unlimitednovelty.com/2012/03/dont-use-bcrypt.html
private static String hash(String password, byte[] salt) throws Exception {
if (password == null || password.len...
Save PL/pgSQL output from PostgreSQL to a CSV file
... CSV HEADER' > groups.csv
Or on a kubernetes cluster, in docker, over HTTPS??:
kubectl exec -t postgres-2592991581-ws2td 'psql -d mydb -c "COPY groups TO STDOUT WITH CSV HEADER"' > groups.csv
So versatile, much commas!
Do you even?
Yes I did, here are my notes:
The COPYses
Using /copy...
Quicksort vs heapsort
Both quicksort and heapsort do in-place sorting. Which is better? What are the applications and cases in which either is preferred?
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What is the reason for performing a double fork when creating a daemon?
I'm trying to create a daemon in python. I've found the following question , which has some good resources in it which I am currently following, but I'm curious as to why a double fork is necessary. I've scratched around google and found plenty of resources declaring that one is necessary, but not ...