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REST response code for invalid data
...dy contains well-formed (i.e., syntactically correct), but semantically erroneous, XML instructions.
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'typeid' versus 'typeof' in C++
...t cat derives animal:
animal* a = new cat; // animal has to have at least one virtual function
...
if( typeid(*a) == typeid(cat) )
{
// the object is of type cat! but the pointer is base pointer.
}
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How to expire session due to inactivity in Django?
...e import datetime
from django.http import HttpResponseRedirect
class SessionExpiredMiddleware:
def process_request(request):
last_activity = request.session['last_activity']
now = datetime.now()
if (now - last_activity).minutes > 10:
# Do logout / expire ...
What does the restrict keyword mean in C++?
...ia example is very illuminating.
It clearly shows how as it allows to save one assembly instruction.
Without restrict:
void f(int *a, int *b, int *x) {
*a += *x;
*b += *x;
}
Pseudo assembly:
load R1 ← *x ; Load the value of x pointer
load R2 ← *a ; Load the value of a pointer
add R2 +...
How can I decompress a gzip stream with zlib?
...can provide some guidelines for iterative decompression of gzip stream. In one-shot gzip decompression where your output stream and size should be fixed and sufficient for storing the whole decompressed output. This value depends on gzip decompression effectiveness that can vary according to data en...
How can I push a local Git branch to a remote with a different name easily?
... pull from, defined by branch.newb.merge), rather than pushing branches to ones matching in name (which is the default setting for push.default, matching).
git config push.default upstream
Note that this used to be called tracking not upstream before Git 1.7.4.2, so if you're using an older versi...
Change color of PNG image via CSS?
...
If anyone needs it, here is a TS conversion of this code gist.github.com/dwjohnston/7e60bf5d4b6c071cd869f9f346241c08
– dwjohnston
Oct 15 '19 at 23:45
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When should I use GC.SuppressFinalize()?
...lizer queue. It looks like a C++ destructor, but doesn't act anything like one.
The SuppressFinalize optimization is not trivial, as your objects can live a long time waiting on the finalizer queue. Don't be tempted to call SuppressFinalize on other objects mind you. That's a serious defect waiting...
Script parameters in Bash
...s} in
f) FROM_VAL=${OPTARG} ;;
t) TO_VAL=${OPTARG} ;;
esac
done
getopts is a program that processes command line arguments and conveniently parses them for you.
f:t: specifies that you're expecting 2 parameters that contain values (indicated by the colon). Something like f:t:v say...
Automatically plot different colored lines
...
For a one-off axis: set(gca,'ColorOrder',jet(5));
– Evgeni Sergeev
Sep 30 '13 at 2:41
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