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What does “coalgebra” mean in the context of programming?
...rmation Identity → f.
Now we can think about a monad as just an algebra based around some functor f with operations f ∘ f → f and Identity → f. Doesn't this look familiar? It's very similar to a monoid, which was just some type τ with operations τ × τ → τ and () → τ.
So a monad i...
error: request for member '..' in '..' which is of non-class type
...
Adding to the knowledge base, I got the same error for
if(class_iter->num == *int_iter)
Even though the IDE gave me the correct members for class_iter. Obviously, the problem is that "anything"::iterator doesn't have a member called num so I ...
PHP PDO returning single row
...
You can use fetch and LIMIT together. LIMIT has the effect that the database returns only one entry so PHP has to handle very less data. With fetch you get the first (and only) result entry from the database reponse.
You can do more optimizing by setting the fetching type, see http://www.php.net...
How to atomically delete keys matching a pattern using Redis
... you need that feature you should simply partition the data by numetic database or server, and use flush / flushdb
– Marc Gravell♦
Oct 26 '14 at 16:45
11
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Appending a line to a file only if it does not already exist
...es, any competent admin ought to understand it. However, it works as such based on a side effect of the expression evaluation algorithm within shell. So you can call it all you like, except straightforward -- which was my original point.
– Marcelo Ventura
Oct...
PHPUnit assert that an exception was thrown?
... is passed in the message. Your system might display a message to the user based on the Exception message (not the Exception type). In that case, it does matter which message the user sees, hence, you should test the error message.
– Vanja D.
Apr 20 '18 at 15:3...
Why is Visual Studio 2013 very slow?
...gt; General" section and clear the "Automatically adjust visual experience based on client performance" check box. (Refer to the following screen shot for this step.)
Clear the "Use hardware graphics acceleration if available" check box to prevent the use of hardware graphics acceleration.
Select or...
Releasing memory in Python
...does it release 50.5mb in particular - what is the amount that is released based on?
What it's based on is, ultimately, a whole series of coincidences inside Python and malloc that are very hard to predict.
First, depending on how you're measuring memory, you may only be measuring pages actually ...
How would one write object-oriented code in C? [closed]
...n (void) {
int status;
tCommClass commTcp, commHttp;
// Same 'base' class but initialised to different sub-classes.
tcpInit (&commTcp);
httpInit (&commHttp);
// Called in exactly the same manner.
status = (commTcp.open)(&commTcp, "bigiron.box.com:5000");
...
Django URL Redirect
...
You can try the Class Based View called RedirectView
from django.views.generic.base import RedirectView
urlpatterns = patterns('',
url(r'^$', 'macmonster.views.home'),
#url(r'^macmon_home$', 'macmonster.views.home'),
url(r'^macmon_ou...