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Abstract functions in Swift Language
...abstractFunction. The protocol would stay the same, and the classes would now look like:
class BaseThing
{
func sharedFunction(thing: Thing)
{
println("All classes share this implementation")
thing.abstractFunction()
}
}
class DerivedThing : BaseThing, Thing
{
fun...
Combining Multiple Commits Into One Prior To Push
...ne with. So it has to be picked or 'p'. Use 'Esc' to exit insert mode.
3) Now, save the editor with the following command.
:wq
When you save that, you have a single commit that introduces the changes of all three previous commits.
Hope this will help you.
...
Gridview with two columns and auto resized images
...white"
android:background="#55000000"/>
</FrameLayout>
Now make some sort of adapter for your GridView:
src/com/example/graphicstest/MyAdapter.java
private final class MyAdapter extends BaseAdapter {
private final List<Item> mItems = new ArrayList<Item>();
p...
How do I automatically update a timestamp in PostgreSQL
...update_modified_column()
RETURNS TRIGGER AS $$
BEGIN
NEW.modified = now();
RETURN NEW;
END;
$$ language 'plpgsql';
Apply the trigger like this:
CREATE TRIGGER update_customer_modtime BEFORE UPDATE ON customer FOR EACH ROW EXECUTE PROCEDURE update_modified_column();
...
FFmpeg on Android
I have got FFmpeg compiled (libffmpeg.so) on Android. Now I have to build either an application like RockPlayer or use existing Android multimedia framework to invoke FFmpeg.
...
How can I list ALL DNS records?
...nswer "${3:-any}"
else
dig +nocmd "$1" +noall +answer "${2:-any}"
fi
Now I use dg example.com to get a nice, clean list of DNS records, or dg example.com x to include a bunch of other popular subdomains.
grep -vE "${wild_ips}" filters out records that could be the result of a wildcard DNS ent...
Querying DynamoDB by date
...ps on the range key only. The hash key is required such that the service knows which partition to look in to find the data.
You can of course perform a scan operation to filter by the date value, however this would require a full table scan, so it is not ideal.
If you need to perform an indexed l...
What are namespaces?
... output() to output the final feed.
When you call output(), how does PHP know whether to use your output() function or the RSS library's output() function? It doesn't. Unless you're using namespaces.
Example
How do we solve having two output() functions? Simple. We stick each output() functio...
Why do we need RESTful Web Services?
...tes that did not exist when the
browser was released? How can the
client know about these sites?
These may sound like inane questions, but if you know the answer, then you can start to see what REST is all about.
Look at StackOverflow for more benefits of REST. When I am looking at a question, I...
Difference between static memory allocation and dynamic memory allocation
I would like to know what is the difference between static memory allocation and dynamic memory allocation?
7 Answers
...