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What does the Q_OBJECT macro do? Why do all Qt objects need this macro?
..._OBJECT may well break an unrelated class that happens to contain a method called metaObject.
– Unslander Monica
Apr 7 '16 at 20:44
...
What exactly does the Access-Control-Allow-Credentials header do?
...with the request, and this behavior can lead to a class of vulnerabilities called cross-site request forgery, or CSRF.
In order to reduce the chance of CSRF vulnerabilities in CORS, CORS requires both the server and the client to acknowledge that it is ok to include cookies on requests. Doing this ...
Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
... 00000000040ED948]:
# tracemem[00000000040ED948 -> 00000000040ED830]: .Call copy $<-.data.table $<-
.Internal(inspect(DT))
# @0000000003B7E2A0 19 VECSXP g0c7 [OBJ,NAM(2),TR,ATT] (len=2, tl=100)
# @00000000040C2288 14 REALSXP g0c2 [NAM(2)] (len=2, tl=0) 1,2
# @00000000040C2250 14 REAL...
What are all the user accounts for IIS/ASP.NET and how do they differ?
...n using the Application Pool Identity feature then a "synthesised" account called IIS AppPool\<pool name> will be created on the fly to used as the pool identity. In this case there will be a synthesised account called IIS AppPool\DefaultAppPool created for the life time of the pool. If you de...
invalid multibyte char (US-ASCII) with Rails and Ruby 1.9
... still have to play this game. Hold on, phone ringing... It was 2033, they called to say they still play it. Oh well, thanks for reminding me, Jarek Zmudzinski from 2010.
– thomax
Sep 16 '13 at 10:09
...
PHP random string generator
...
To answer this question specifically, two problems:
$randstring is not in scope when you echo it.
The characters are not getting concatenated together in the loop.
Here's a code snippet with the corrections:
function generateRandomString($length = 10...
Dynamic constant assignment
...how), the actual string object itself is different each time the method is called. For example:
def foo
p "bar".object_id
end
foo #=> 15779172
foo #=> 15779112
Perhaps if you explained your use case—why you want to change the value of a constant in a method—we could help you with a b...
Does the ternary operator exist in R?
...(xs[[1]] == as.name("<-")) {
xs[[3]] <- r
eval.parent(as.call(xs))
} else {
r
}
}
You can get rid of brackets:
> y <- 1 ? 2*3 : 4
> y
[1] 6
> y <- 0 ? 2*3 : 4
> y
[1] 4
> 1 ? 2*3 : 4
[1] 6
> 0 ? 2*3 : 4
[1] 4
These are not for daily use, ...
std::next_permutation Implementation Explanation
...
Thanks for explanation! This algorithm is called Generation in lexicographic order. There are numbers of such algorithm in Combinatorics, but this is the most classical one.
– chain ro
Mar 10 '15 at 2:59
...
Integrating the ZXing library directly into my Android application
... // Use Intent.putExtra(DATA, string) where string is the phone number to call.
public static final String PHONE = "PHONE_TYPE";
// An SMS type. Use Intent.putExtra(DATA, string) where string is the number to SMS.
public static final String SMS = "SMS_TYPE";
public...