大约有 40,000 项符合查询结果（耗时：0.0540秒） [XML]
Why use static_cast(x) instead of (int)x?
...e main reason is that classic C casts make no distinction between what we call static_cast<>(), reinterpret_cast<>(), const_cast<>(), and dynamic_cast<>(). These four things are completely different.
A static_cast<>() is usually safe. There is a valid conversion in the...
Is there a way to make R beep/play a sound at the end of a script?
...ion sounds in R which should work cross-platform. Run the following to install beepr and make a sound:
install.packages("beepr")
library(beepr)
beep()
More info at github: https://github.com/rasmusab/beepr
share
...
How do I get a string format of the current date time, in python?
...
#python3
import datetime
print(
'1: test-{date:%Y-%m-%d_%H:%M:%S}.txt'.format( date=datetime.datetime.now() )
)
d = datetime.datetime.now()
print( "2a: {:%B %d, %Y}".format(d))
# see the f" to tell python this is a f string, no .format
print(f"2b: {d:%B %d, %Y}")
print(f"3...
How can you iterate over the elements of an std::tuple?
...rloads for every type the tuple might contain. This works best if you know all the tuple elements will share a common base class or something similar.
share
|
improve this answer
|
...
Express res.sendfile throwing forbidden error
...ath.resolve('../../some/path/to/file.txt');
relative to file: path.resolve(__dirname+'../../some/path/to/file.txt');
From reading the link from @Joe's comment, it sounds like relative paths are a security risk if you accept user input for the path (e.g. sendfile('../.ssh/id_rsa') might be a hacker...
How to avoid warning when introducing NAs by coercion
... na = x %in% na.strings
x[na] = 0
x = as.numeric(x)
x[na] = NA_real_
x
}
as.num(c("1", "2", "X"), na.strings="X")
#[1] 1 2 NA
share
|
improve this answer
|
...
CSS Display an Image Resized and Cropped
...elative on the containing div. If you don't, I've found that IE won't actually clip the image.
– Frank Schwieterman
Jun 26 '09 at 22:56
...
How to merge a transparent png image with another image using PIL
...
To make sure the foreground contains transparency in all cases, use foreground.convert('RGBA') for the mask parameter.
– Mark Ransom
Oct 4 '12 at 2:28
2
...
How do I instantiate a Queue object in java?
...n't want to do this, but it's listed as an option for the sake of covering all the bases.
new Queue<Tree>() {
public Tree element() {
...
};
public boolean offer(Tree element) {
...
};
...
};
...
How do I directly modify a Google Chrome Extension File? (.CRX)
... I found this:
The Google Chrome Extension file type is CRX. It is essentially a compression format. So if you want to see what is behind an extension, the scripts and the code, just change the file-type from “CRX” to “ZIP” .
Unzip the file and you will get all the info you need. This way ...