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Virtual functions and performance - C++
...the iPhone is a good example of performant code: youtube.com/watch?v=Pdk2cJpSXLg
– Crashworks
Jun 10 '11 at 22:18
13
...
Step-by-step debugging with IPython
... and a list of commands. IPython is now called (edit: part of) Jupyter.
ps: note that an ipdb command takes precedence over python code. So in order to write list(foo) you'd need print list(foo).
Also, if you like the ipython prompt (its emacs and vim modes, history, completions,…) it's easy t...
指定组件的大小 · App Inventor 2 中文网
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指定组件的大小
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指定组件的大小
When you create a visible component in the designer, you are typically given the opportunity to specify its height and width. There a...
How to initialize log4j properly?
...stions in Linux how to determine your classpath value:
$ echo $CLASSPATH
$ ps wuax | grep -i classpath
$ grep -Ri classpath /etc/tomcat? /var/lib/tomcat?/conf /usr/share/tomcat?
or from Java: System.getProperty("java.class.path").
Log4j XML
Below is a basic XML configuration file for log4j in XML f...
Detect URLs in text with JavaScript
...ping inside the text, with JavaScript.
OK so lets just use this one: /(https?:\/\/[^\s]+)/g
Again, this is a bad regex. It will have many false positives. However it's good enough for this example.
function urlify(text) {
var urlRegex = /(https?:\/\/[^\s]+)/g;
return text.replace(urlReg...
What's the best way to iterate over two or more containers simultaneously
... pattern occurs often in your data, consider using another pattern which zips two sequences and produces a range of tuples, corresponding to the paired elements:
for (auto& [a, b] : zip(containerA, containerB)) {
a = b;
}
The implementation of zip is left as an exercise for the reader, bu...
What 'sensitive information' could be disclosed when setting JsonRequestBehavior to AllowGet
... way it should be used then everything is fine! :)
– ps_ttf
May 6 '16 at 9:01
1
I'm not sure what...
Vertically align an image inside a div with responsive height
...time:
Vertical Alignment
1) In this approach, we create an inline-block (pseudo-)element as the first (or last) child of the parent, and set its height property to 100% to take all the height of its parent.
2) Also, adding vertical-align: middle keeps the inline(-block) elements at the middle of ...
How to limit the maximum value of a numeric field in a Django model?
...e I think about this, I realize how useful this would be for many Django apps. Perhaps a IntegerRangeField type could be submitted as a patch for the Django devs to consider adding to trunk.
This is working for me:
from django.db import models
class IntegerRangeField(models.IntegerField):
def...
Difference between wait() and sleep()
...call sleep on Thread.
Yet another point is that you can get spurious wakeups from wait (i.e. the thread which is waiting resumes for no apparent reason). You should always wait whilst spinning on some condition as follows:
synchronized {
while (!condition) { mon.wait(); }
}
...