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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()...
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...
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 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...
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 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...
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 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...