大约有 12,000 项符合查询结果（耗时：0.0390秒） [XML]
How to “perfectly” override a dict?
...ndant __dict__ - therefore taking up more space in memory:
>>> s.foo = 'bar'
>>> s.__dict__
{'foo': 'bar', 'store': {'test': 'test'}}
Actually subclassing dict
We can reuse the dict methods through inheritance. All we need to do is create an interface layer that ensures keys...
Prevent HTML5 video from being downloaded (right-click saved)?
...
People could record their entire screen and audio and fool all workarounds, that is why they can only be slowed down.
– kintsukuroi
Apr 28 at 6:11
1
...
How do I create a class instance from a string name in ruby?
...re ruby:
clazz = Object.const_get('ExampleClass')
with modules:
module Foo
class Bar
end
end
you would use
> clazz = 'Foo::Bar'.split('::').inject(Object) {|o,c| o.const_get c}
=> Foo::Bar
> clazz.new
=> #<Foo::Bar:0x0000010110a4f8>
...
function declaration isn't a prototype
...
In C int foo() and int foo(void) are different functions. int foo() accepts an arbitrary number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing. I suggest that you use void consistently when you ...
When should I make explicit use of the `this` pointer?
...A {
int i;
};
template<class T>
struct B : A<T> {
int foo() {
return this->i;
}
};
int main() {
B<int> b;
b.foo();
}
If you omit this->, the compiler does not know how to treat i, since it may or may not exist in all instantiations of A. In or...
is_null($x) vs $x === null in PHP [duplicate]
...is_null or === null. But be aware when using isset on arrays.
$a = array('foo' => null);
var_dump(isset($a['foo'])); // false
var_dump(is_null($a['foo'])); // true
var_dump(array_key_exists('foo', $a)); // true
share
...
Why #define TRUE (1==1) in a C boolean macro instead of simply as 1?
....
An example of how it integrates better is that for instance if function foo has overloads for int and for bool, then foo(TRUE) will choose the bool overload. If TRUE is just defined as 1, then it won't work nicely in the C++. foo(TRUE) will want the int overload.
Of course, C99 introduced bool, ...
What is the difference between “ is None ” and “ ==None ”
...
class Foo:
def __eq__(self,other):
return True
foo=Foo()
print(foo==None)
# True
print(foo is None)
# False
share
|
...
Working with huge files in VIM
...with those changes:
#!/usr/bin/env ruby
matchers={
%q/^CREATE TABLE `foo`/ => %q/CREATE TABLE IF NOT EXISTS `foo`/,
%q/^DROP TABLE IF EXISTS `foo`;.*$/ => "-- DROP TABLE IF EXISTS `foo`;"
}
matchers.each_pair { |m,r|
STDERR.puts "%s: %s" % [ m, r ]
}
STDIN.each { |line|
#ST...
Is it possible to allow didSet to be called during initialization in Swift?
...nswer, you could wrap the lines in a closure. Eg:
class Classy {
var foo: Int! { didSet { doStuff() } }
init( foo: Int ) {
// closure invokes didSet
({ self.foo = foo })()
}
}
Edit: Brian Westphal's answer is nicer imho. The nice thing about his is that it hints at ...