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Ignoring time zones altogether in Rails and PostgreSQL
...m the Postgres epoch, 2000-01-01 00:00:00 UTC.
Postgres also has built-in knowledge of the commonly used UNIX time counting seconds from the UNIX epoch, 1970-01-01 00:00:00 UTC, and uses that in functions to_timestamp(double precision) or EXTRACT(EPOCH FROM timestamptz).
The source code:
* Timestam...
Algorithm to compare two images
...at the minimum) a large human analysed set of test data where matches are known beforehand. If for example in your test data you have 1,000 images where 5% of them match, you now have a reasonably reliable benchmark. An algorithm that finds 10% positives is not as good as one that finds 4% of posi...
How can I reverse a list in Python?
...,2,3,4]
a = a[::-1]
print(a)
>>> [4,3,2,1]
The job is done, and now you have a reversed list.
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JavaScript editor within Eclipse [closed]
... installed Aptana on this threads recommendation and for various reasons I now want to remove it. I've spent 15 minutes trying to figure out how to remove it from my Eclipse 3.4 config with no success - it seems to disable the uninstall buttons - and the only instructions I found on the Aptana site ...
How should equals and hashcode be implemented when using JPA and Hibernate
...ces your entity in bucket #1. b) your entity (within set) is persisted, it now does have an id and thus you're using hashCode() based on that id. It's different from above and would have placed your entity in the bucket #2. Now, assuming you hold a reference to this entity elsewhere, try calling Set...
How are virtual functions and vtable implemented?
We all know what virtual functions are in C++, but how are they implemented at a deep level?
12 Answers
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How can I wait for set of asynchronous callback functions?
...
if (ajaxCallsRemaining <= 0) {
// all data is here now
// look through the returnedData and do whatever processing
// you want on it right here
}
});
}
Note: error handling is important here (not shown because it's specific to how you're...
When should I create a destructor?
...here could have been a thread abort halfway through writing the double and now the finalizer has to deal with a half-initialized half-zero double.
– Eric Lippert
Mar 31 '11 at 14:11
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How to have Android Service communicate with Activity
...answered Mar 17 '10 at 15:54
MrSnowflakeMrSnowflake
4,55422 gold badges2626 silver badges3232 bronze badges
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How can I run code on a background thread on Android?
...k or update UI with data retrieved from background process.
If you don't know how to start here is nice tutorial:
Understanding AsyncTask – Once and
Forever
Note: Also there is possibility to use IntentService with ResultReceiver that works as well.
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