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Default function arguments in Rust
...could also use an "arguments" struct and the From/Into traits:
pub struct FooArgs {
a: f64,
b: i32,
}
impl Default for FooArgs {
fn default() -> Self {
FooArgs { a: 1.0, b: 1 }
}
}
impl From<()> for FooArgs {
fn from(_: ()) -> Self {
Self::default()...
What is the difference between == and equals() in Java?
...les have the same references
(aka pointer to a memory address).
String foo = new String("abc");
String bar = new String("abc");
if(foo==bar)
// False (The objects are not the same)
bar = foo;
if(foo==bar)
// True (Now the objects are the same)
Whereas the equals() method tests whether tw...
How and where are Annotations used in Java?
...compiler extensions). Consider for example the Override annotation:
class Foo {
@Override public boolean equals(Object other) {
return ...;
}
}
This one is actually built into the Java JDK. The compiler will signal an error, if some method is tagged with it, which does not overri...
How to exclude a directory in find . command
...files that need to be sent as-is.
Note [1]: If you want to exclude /tmp/foo/bar and you run find like this "find /tmp \(..." then you must specify -path /tmp/foo/bar. If on the other hand you run find like this cd /tmp; find . \(... then you must specify -path ./foo/bar.
...
Use PHP composer to clone git repo
...
I was encountering the following error: The requested package my-foo/bar could not be found in any version, there may be a typo in the package name.
If you're forking another repo to make your own changes you will end up with a new repository.
E.g:
https://github.com/foo/bar.git
=>
h...
What are good uses for Python3's “Function Annotations”
... mm
and an example of use:
from mm import multimethod
@multimethod
def foo(a: int):
return "an int"
@multimethod
def foo(a: int, b: str):
return "an int and a string"
if __name__ == '__main__':
print("foo(1,'a') = {}".format(foo(1,'a')))
print("foo(7) = {}".format(foo(7)))
Th...
Named regular expression group “(?Pregexp)”: what does “P” stand for?
... which all begin with (?P .
Currently there are two of them:
(?P<foo>...) Similar to regular grouping parentheses, but the text
matched by the group is accessible after the match has been performed,
via the symbolic group name "foo".
(?P=foo) Matches the same string as that mat...
Which is better, return value or out parameter?
..., it stops the caller from having to declare the variable separately:
int foo;
GetValue(out foo);
vs
int foo = GetValue();
Out values also prevent method chaining like this:
Console.WriteLine(GetValue().ToString("g"));
(Indeed, that's one of the problems with property setters as well, and i...
Convert string to Python class object?
...s eval() on untrusted strings?)
This seems simplest.
>>> class Foo(object):
... pass
...
>>> eval("Foo")
<class '__main__.Foo'>
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Which comment style should I use in batch files?
...re expanded. Suppose you have (wrongly) set TARGET=C:\Program Files (x86)\"foo.exe", and inside a DO(..) expression you have :: echo %TARGET% you will get an error because the (x86) gets expanded before the whole expression gets evaluated, leading to an invalid DO(..) expression and very inexplicabl...