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When do I use a dot, arrow, or double colon to refer to members of a class in C++?
...
Dot operator is used in direct member selection scenarios.
print(a.b)
Here, we are accessing b, which is a direct member of an object a. So, primarily, a is an object and b is a member (function/ variable etc) of a.
Arrow operator is used in indirect membe...
Regex doesn't work in String.matches()
...wercase letters, you can use .matches(), but you need to match one or more characters: append a + to your character class, as in [a-z]+. Or use ^[a-z]+$ and .find().
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IOCTL Linux device driver [closed]
...vr_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n", DRIVER_RELEASE);
}
static DEVICE_ATTR(version, S_IRUGO, mydrvr_version_show, NULL);
And during driver setup:
device_create_file(dev, &dev_attr_version);
You would then ha...
Rename multiple files by replacing a particular pattern in the filenames using a shell script [dupli
...tern ^([^-]+)-([^.]+) means: from the start of the name, capture 1 or more chars that are NOT -, then expect a dash, then capture 1 or more chars that are not .. $1 is the first capture, $2 is the second.
– erich2k8
Apr 18 '19 at 15:53
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How to check if a String contains another String in a case insensitive manner in Java?
..._INSENSITIVE).matcher(source).find();
EDIT: If s2 contains regex special characters (of which there are many) it's important to quote it first. I've corrected my answer since it is the first one people will see, but vote up Matt Quail's since he pointed this out.
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Resolving ambiguous overload on function pointer and std::function for a lambda using +
...da]/3
The type of the lambda-expression [...] is a unique, unnamed non-union class type — called the closure type — whose properties are described below.
[expr.prim.lambda]/6
The closure type for a lambda-expression with no lambda-capture has a public non-virtual non-explicit const con...
What are rvalues, lvalues, xvalues, glvalues, and prvalues?
...of rvalue, i.e. they're the rvalues that aren't xvalues.
Glvalues are the union of xvalues and lvalues in one group, because they do share a lot of properties in common.
So really, it all comes down to xvalues and the need to restrict movement to exactly and only certain places. Those places are ...
Concept of void pointer in C programming
...l incorrectly, you can safely dereference a void* in two ways. Casting to char* is always acceptable, and if you know the original type it points to you can cast to that type. The void* has lost the type info so it'd have to be stored elsewhere.
– Dan Olson
M...
Disable individual Python unit tests temporarily
...-excursion
(beginning-of-line)
(search-forward "def")
(forward-char)
(if (looking-at "disable_")
(zap-to-char 1 ?_)
(insert "disable_"))))
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Can I use a binary literal in C or C++?
...namespace std;
int main() {
unsigned short b = BOOST_BINARY( 10010 );
char buf[sizeof(b)*8+1];
printf("hex: %04x, dec: %u, oct: %06o, bin: %16s\n", b, b, b, itoa(b, buf, 2));
cout << setfill('0') <<
"hex: " << hex << setw(4) << b << ", " <<
...