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What does the 'L' in front a string mean in C++?
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'L' means wchar_t, which, as opposed to a normal character, requires 16-bits of storage rather than 8-bits. Here's an example:
"A" = 41
"ABC" = 41 42 43
L"A" = 00 41
L"ABC" = 00 41 00 42 00 43
A wchar_t is twice big as a...
Pass entire form as data in jQuery Ajax function
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what is I need some input with the same name ? I mean, like having them in rows ? how can I send that in an array or something ?
– Francisco Corrales Morales
Feb 9 '15 at 18:02
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Passing data to a bootstrap modal
...').val(bookId); can you tell me what does this do? So if the modal is open meaning the value of the input name bookId is the value from which it was clicked right?
– treblaluch
Feb 4 '16 at 3:28
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Can I use non existing CSS classes?
...ts, and your markup is perfectly valid as it is.
This doesn't necessarily mean that you need to have a class declared in the HTML before you can use it in CSS either. See ruakh's comment. Whether or not a selector is valid depends entirely on the selector syntax, and CSS has its own set of rules fo...
MongoDB Aggregation: How to get total records count?
...sults are stored as an array of documents.
In this particular case, this means that one can do something like this:
$result = $collection->aggregate([
{ ...execute queries, group, sort... },
{ ...execute queries, group, sort... },
{ ...execute queries, group, sort... },
$facet: {
p...
How to get form field's id in Django?
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I think what you mean is that you can use "auto_id" for the id, but you have to use "html_name" for the name. Sadly I find your answer is worded confusingly given the question.
– Steve
Nov 1 '12 at 21:04...
What's the difference between lapply and do.call?
...example with a list :
X <- list(1:3,4:6,7:9)
With lapply you get the mean of every element in the list like this :
> lapply(X,mean)
[[1]]
[1] 2
[[2]]
[1] 5
[[3]]
[1] 8
do.call gives an error, as mean expects the argument "trim" to be 1.
On the other hand, rbind binds all arguments ro...
Assign multiple columns using := in data.table, by group
...hello
# 4: 1 4 hi hello
# 5: 2 5 hi hello
# 6: 3 6 hi hello
x[ , c("mean", "sum") := list(mean(b), sum(b)), by = a][]
# a b col1 col2 mean sum
# 1: 1 1 hi hello 2.5 5
# 2: 2 2 hi hello 3.5 7
# 3: 3 3 hi hello 4.5 9
# 4: 1 4 hi hello 2.5 5
# 5: 2 5 hi hello 3.5 7
#...
Non-Relational Database Design [closed]
...our head against anything that seems impossible?
Not yet. Map/reduce as a means of querying a database is unfamiliar, and requires a lot more thinking than writing SQL. There is a fairly small number of primitives, so getting the results you need is primarily a question of being creative with how y...
How to make an Android Spinner with initial text “Select One”?
...o work in future OS updates. It seems likely that it will, but it is by no means guaranteed.
Normally I wouldn't condone something like this, but this question has been asked enough times and it seems like a reasonable enough request that I thought I would post my solution.
/**
* A modified Spinn...