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New self vs. new static
... 5.3's late static bindings, refers to whatever class in the hierarchy you called the method on.
In the following example, B inherits both methods from A. The self invocation is bound to A because it's defined in A's implementation of the first method, whereas static is bound to the called class (a...
How do I prevent site scraping? [closed]
...g well.
There's various types of scraper, and each works differently:
Spiders, such as Google's bot or website copiers like HTtrack, which recursively follow links to other pages in order to get data. These are sometimes used for targeted scraping to get specific data, often in combination with a...
What do hjust and vjust do when making a plot using ggplot?
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I have tried that, and I get Error in grid.Call("L_textBounds", as.graphicsAnnot(x$label), x$x, x$y, : Polygon edge not found (zero-width or zero-height?) for vjust = .72 and higher.
– William Gunn
Sep 3 '11 at 0:48
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In log4j, does checking isDebugEnabled before logging improve performance?
... using Log4J in my application for logging. Previously I was using debug call like:
16 Answers
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jQuery: Can I call delay() between addClass() and such?
...{
$(this).removeClass("error").dequeue();
});
The reason you need to call next or dequeue is to let jQuery know that you are done with this queued item and that it should move on to the next one.
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Getting attribute using XPath
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Thanks! This solved a similar problem I had with a data attribute inside a Div.
<div id="prop_sample" data-want="data I want">data I do not want</div>
Use this xpath: //*[@id="prop_sample"]/@data-want
Hope this helps someone else!
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What is difference between instantiating an object using new vs. without
...trast:
Time* t = new Time(12, 0, 0);
... allocates a block of memory by calling either ::operator new() or Time::operator new(), and subsequently calls Time::Time() with this set to an address within that memory block (and also returned as the result of new), which is then stored in t. As you kno...
Python vs Bash - In which kind of tasks each one outruns the other performance-wise? [closed]
...e files needed are and sets variables and command line parameters, finally calling the program. That's a shell's simplest use.
Linux as we know it however would hardly be Linux without the thousands of shell scripts that startup the system, respond to events, control execution priorities and compil...
Throw keyword in function's signature
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That's just what it comes down to, you probably just will end up with a call to terminate() and your program dying a quick but painful death.
The GOTWs conclusion is:
So here’s what seems to be the best advice we as a community have learned as of today:
Moral #1: Never write an exc...
Can you change what a symlink points to after it is created?
Does any operating system provide a mechanism (system call — not command line program) to change the pathname referenced by a symbolic link (symlink) — other than by unlinking the old one and creating a new one?
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