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How to define “type disjunction” (union types)?
...mplicit object StringWitness extends StringOrInt[String]
}
Next, declare foo like this:
object Bar {
def foo[T: StringOrInt](x: T) = x match {
case _: String => println("str")
case _: Int => println("int")
}
}
And that's it. You can call foo(5) or foo("abc"), and it will work,...
Accessing items in an collections.OrderedDict by index
...ort collections
>>> d = collections.OrderedDict()
>>> d['foo'] = 'python'
>>> d['bar'] = 'spam'
>>> d.items()
[('foo', 'python'), ('bar', 'spam')]
>>> d.items()[0]
('foo', 'python')
>>> d.items()[1]
('bar', 'spam')
Note for Python 3.X
dict.ite...
Custom Python list sorting
...ter alternative to implement the same sorting:
alist.sort(key=lambda x: x.foo)
Or alternatively:
import operator
alist.sort(key=operator.attrgetter('foo'))
Check out the Sorting How To, it is very useful.
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How to suppress “unused parameter” warnings in C?
...ing __attribute__ ((unused)) just before the parameter. For example:
void foo(workerid_t workerId) { }
becomes
void foo(__attribute__((unused)) workerid_t workerId) { }
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The Concept of 'Hold space' and 'Pattern space' in sed
...out each host, with lots of junk in between that I dont care about.
Host: foo1
some junk, doesnt matter
some junk, doesnt matter
Info: about foo1 that I really care about!!
some junk, doesnt matter
some junk, doesnt matter
Info: a second line about foo1 that I really care about!!
some junk, doesnt ...
JSON datetime between Python and JavaScript
...this works:
date = datetime.datetime.now()
>>> json = dumps(dict(foo='bar', innerdict=dict(date=date)))
>>> json
'{"innerdict": {"date": "2010-07-15T13:16:38.365579"}, "foo": "bar"}'
>>> loads(json)
{u'innerdict': {u'date': datetime.datetime(2010, 7, 15, 13, 16, 38, 36557...
Overriding a JavaScript function while referencing the original
...roxy pattern really helped.....Actually I wanted to call a global function foo..
In certain pages i need do to some checks. So I did the following.
//Saving the original func
var org_foo = window.foo;
//Assigning proxy fucnc
window.foo = function(args){
//Performing checks
if(checkConditi...
Best practices to test protected methods with PHPUnit
... $method->setAccessible(true);
return $method;
}
public function testFoo() {
$foo = self::getMethod('foo');
$obj = new MyClass();
$foo->invokeArgs($obj, array(...));
...
}
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Is 'float a = 3.0;' a correct statement?
...ific scenarios.
For performance reasons:
Specifically, consider:
float foo(float x) { return x * 0.42; }
Here the compiler will emit a conversion (that you will pay at runtime) for each returned value. To avoid it you should declare:
float foo(float x) { return x * 0.42f; } // OK, no conversi...
Why do I have to access template base class members through the this pointer?
... int A;
#endif
static const int x = 2;
template <typename T> void foo() { A *x = 0; }
if A is a type, that declares a pointer (with no effect other than to shadow the global x). If A is an object, that's multiplication (and barring some operator overloading it's illegal, assigning to an r...