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What is the difference between the GNU Makefile variable assignments =, ?=, := and +=?
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I suggest you do some experiments using "make". Here is a simple demo, showing the difference between = and :=.
/* Filename: Makefile*/
x := foo
y := $(x) bar
x := later
a = foo
b = $(a) bar
a = later
test:
@echo x - $(x)
@echo y - $(y)
@echo a - $(a)
@echo b - $(b)
ma...
Android: ProgressDialog.show() crashes with getApplicationContext
...getApplicationContext());
dialog.show();
}
});
Based on the previous answers that suggested the context was the wrong one, i changed the getApplicationContext() to retrieve the context from the View passed in to the buttons onClick method.
myButton.setOnClickListener(new...
Loadbalancing web sockets
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Put a L3 load-balancer that distributes IP packets based on source-IP-port hash to your WebSocket server farm. Since the L3 balancer maintains no state (using hashed source-IP-port) it will scale to wire speed on low-end hardware (say 10GbE). Since the distribution is determi...
What is the best way to stop people hacking the PHP-based highscore table of a Flash game
...d with the shared secret. This salt value should be stored in a local database of pending queries, and should have a timestamp associated with it so that it can "expire" after perhaps one minute.
The flash game combines the salt value with the shared secret and calculates a hash to verify that this...
ReactJS state vs prop
...it change over time? If not, it probably isn't state.
Can you compute it based on any other state or props in your
component? If so, it's not state.
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Python int to binary string?
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For a more general philosophy, no language or library will give its user base everything that they desire. If you're working in an environment that doesn't provide exactly what you need, you should be collecting snippets of code as you develop to ensure you never have to write the same thing twice...
Any reason to clean up unused imports in Java, other than reducing clutter?
...lain this. After attempting to increase memory settings (this is running a 64 bit JVM on a 64 bit CentOS!) to something well beyond where the clients could compile, I examined the checkins one by one.
There was an improper import that a developer had used and abandoned (they used the class, auto-im...
How to sort a dataframe by multiple column(s)
... Easy enough: dd[ order(-dd[,4], dd[,1]), ], but can't use with for name-based subsetting.
– Dirk Eddelbuettel
Oct 21 '12 at 14:34
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How to determine the memory footprint (size) of a variable?
... not definate. It can depend apparently on the php version and possibly on 64/32 bit.
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What is the difference between instanceof and Class.isAssignableFrom(…)?
... performance:
isInstance
instanceof (+ 0.5%)
isAssignableFrom (+ 2.7%)
Based on a benchmark of 2000 iterations on JAVA 8 Windows x64, with 20 warmup iterations.
In theory
Using a soft like bytecode viewer we can translate each operator into bytecode.
In the context of:
package foo;
public c...