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What algorithms compute directions from point A to point B on a map?
...ey meet in the middle. This eliminates roughly half the work (2*pi*(r/2)^2 vs pi*r^2).
To avoid exploring the back-alleys of every city between your source and destination, you can have several layers of map data: A 'highways' layer that contains only highways, a 'secondary' layer that contains only...
Where do “pure virtual function call” crashes come from?
...
I use VS2010 and whenever I try calling destructor directly from public method, I get a "pure virtual function call" error during runtime.
template <typename T>
class Foo {
public:
Foo<T>() {};
~Foo<T>() {};
...
How can I get the current language in Django?
... ...), which is a lot more common e.g. www.example.com/en/<somepath> vs www.example.com/fr/<somepath>, use django.utils.translation.get_language_from_request(request, check_path=False). Also, it will always return a valid language set in settings.LANGUAGES
I found it not very easy to fi...
Check if full path given
...ng Files --> Naming Files, Paths, and Namespaces --> Fully Qualified vs. Relative Paths
For Windows API functions that manipulate files, file names can often
be relative to the current directory, while some APIs require a fully
qualified path. A file name is relative to the current dir...
Is there a “not in” operator in JavaScript for checking object properties?
...undefined is much faster (albeit potentially dangerous): jsperf.com/not-in-vs-is-undefined.
– etpinard
May 7 '15 at 14:39
...
Node.js or Erlang
...core 2.4GHz AMD VM). This is from SyncPad's experience of comparing Erlang vs Node.js implementations of their virtual whiteboard server application.
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When should I use ugettext_lazy?
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ugettext() vs. ugettext_lazy()
In definitions like forms or models you should use ugettext_lazy because the code of this definitions is only executed once (mostly on django's startup); ugettext_lazy translates the strings in a lazy fas...
Twitter Bootstrap Customization Best Practices [closed]
...fter where they are included.
...
// Components: Nav
@import "bootstrap/navs.less";
@import "bootstrap/navbar.less";
// overrides
.navbar-fixed-top .navbar-inner, .navbar-fixed-bottom .navbar-inner {
border-radius: 0 0 0 0;
padding: 10px;
}
.nav-tabs, .nav-pills {
text-transform: uppe...
android.view.InflateException: Binary XML file: Error inflating class fragment
...bbard's, but uses a different approach for finding the root cause (logging vs. debugger).
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Does the APNS device token ever change, once created?
...token is invariant for a given device, application, and domain (production vs. sandbox). I believe that this must remain true in order for the system to work reliably. Consider the situation where an application update triggers a new APN token; if I were using the greatest new Twitter-like app, wi...