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C++ Object Instantiation
...a = new B();
a->f();
delete a;
return 0;
}
This will print "B". Now lets see what happens when using Stack:
int main(void) {
A a = B();
a.f();
return 0;
}
This will print "A", which might not be intuitive to those who are familiar with Java or other object oriented languages. The...
How do you change the size of figures drawn with matplotlib?
...
Solved me a problem with imshow, now I'm using this code just after eliminating the space around the plotting area with plt.subplots_adjust(left=0.0, right=1.0, bottom=0.0, top=1.0).
– heltonbiker
Nov 26 '12 at 14:21
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Using 'starts with' selector on individual class names
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now that I think about it, your initial solution works just fine. A DIV that had a class like "apple-brick apple-horse" would still be just selected once into the jQuery object.
– DA.
Fe...
Are Exceptions in C++ really slow
...th a taxi waiting, so I only had time then for a short comment. But having now commented and upvoted and downvoted I’d better add my own answer. Even if Matthieu’s answer already is pretty good.
Are exceptions especially slow in C++, compared to other languages?
Re the claim
“I was wat...
PHP namespaces and “use”
...is equivalent to:
use My\Full\Namespace as Namespace;
// Namespace\Foo is now shorthand for My\Full\Namespace\Foo
If the use operator is used with a class or interface name, it has the following uses:
// after this, "new DifferentName();" would instantiate a My\Full\Classname
use My\Full\Classna...
What is the difference between the 'COPY' and 'ADD' commands in a Dockerfile?
....gz DOES NOT EXTRACT the archive to the filesystem (I double checked right now to be sure and it's confirmed)
– Cecile
Oct 19 '18 at 15:19
50
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How to check if a URL is valid
...:isbn:0451450523" =~ URI::regexp
=> 0
That being said, as far as I know, Ruby doesn't have a default way to parse URLs , so you'll most likely need a gem to do so. If you need to match URLs specifically in HTTP or HTTPS format, you could do something like this:
uri = URI.parse(my_possible_ur...
Which is faster in Python: x**.5 or math.sqrt(x)?
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I've now run it 3 times on codepad.org and all three times a() was much faster than b().
– Jeremy Ruten
Nov 29 '08 at 1:38
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What's the easiest way to install a missing Perl module?
... IIRC the latest ActivePerl no longer has command-line ppm, it now opens a fancy GUI.
– Kev
Nov 8 '08 at 17:18
6
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Git diff against a stash
...hanges un-stashing will make to the current working tree? I would like to know what changes will be made before applying them!
...