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Difference between Covariance & Contra-variance
...vide so-called “multiple dispatch” or multi methods (this is basically selecting function overloads at run time, e.g. with CLOS) or get the desired effect by using dynamic typing.
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OPTION (RECOMPILE) is Always Faster; Why?
...y estimates for applying both restrictions and a poor execution plan being selected. The fix in this case would be to create a statistics object linking the two columns, which is not an expensive operation.
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A gentle tutorial to Emacs/Swank/Paredit for Clojure
...mgmt
for finding files, searching, etc
helm – incremental completion
and selection narrowing framework (or
swiper)
Other Resources
If you’re looking for a setup that already has done most/all of this
work for you, a couple options are:
prelude
spacemacs
...
Django dynamic model fields
...y constraint, which may be inefficient on some databases.
You will need to select one of the forks, since the official package is no longer maintained and there is no clear leader.
The usage is pretty straightforward:
import eav
from app.models import Patient, Encounter
eav.register(Encounter)
e...
WebSockets protocol vs HTTP
...a preconceived notion about WebSockets vs HTTP particularly since he never selected an answer nor awarded the bounty.
– kanaka
Feb 15 '13 at 13:06
9
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Best explanation for languages without null
...ilable: isShut==false && isLocked==true. Because the types I have selected as my representation admit this state, I must expend mental effort to ensure that the class never gets into this state (perhaps by explicitly coding an invariant). In contrast, if I were using a language with algebr...
std::function vs template
... in cases with binding, there's a chunk of code which does the adaptation, selected by a code ptr in the function obj, and which picks up data (bound parms) from the function obj (d) the 'bound' function may be inlined into that adaptor, if the compiler can see it.
– greggo
...
How do you parse and process HTML/XML in PHP?
...set to convert XML to an object that can be processed with normal property selectors and array iterators.
SimpleXML is an option when you know the HTML is valid XHTML. If you need to parse broken HTML, don't even consider SimpleXml because it will choke.
A basic usage example can be found at A s...
Big O, how do you calculate/approximate it?
...n't a moron, its average case complexity is O(n log n) and it uses a pivot selection strategy that reduces the odds of hitting the O(n²) case). And both bsearch and qsort can be worse if the comparator function is pathological.
– ShadowRanger
Mar 21 '19 at 14:...
Do sessions really violate RESTfulness?
...H,
is able to create their own transitions at any time (e.g., enter
a URL, select a bookmark, open an editor, etc.)."
Going to the issue of authentication, whether it is accomplished through cookies or headers, as long as the information isn't part of the URI and POST payload, it really has nothi...