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How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
...mport scala.reflect.Manifest
private var map= Map.empty[Any,(Manifest[_], Any)]
def register[T](name: Any, item: T)(implicit m: Manifest[T]) {
map = map.updated(name, m -> item)
}
def get[T](key:Any)(implicit m : Manifest[T]): Option[T] = {
map get key flatMap {
ca...
See changes to a specific file using git
...
Use a command like:
git diff file_2.rb
See the git diff documentation for full information on the kinds of things you can get differences for.
Normally, git diff by itself shows all the changes in the whole repository (not just the current directory).
...
Calling method using JavaScript prototype
... and then calling it from the overriden method, like so
MyClass.prototype._do_base = MyClass.prototype.do;
MyClass.prototype.do = function(){
if (this.name === 'something'){
//do something new
}else{
return this._do_base();
}
};
...
Python's many ways of string formatting — are the older ones (going to be) deprecated?
...0}".format(world, greeting='Hello')
and is extensible through the object.__format__() hook used to handle formatting of individual values.
Note that the old system had % and the Template class, where the latter allows you to create subclasses that add or alter its behaviour. The new-style system ...
How to use base class's constructors and assignment operator in C++?
...Base&) { /*...*/ }
};
class Derived : public Base
{
int additional_;
public:
Derived(const Derived& d)
: Base(d) // dispatch to base copy constructor
, additional_(d.additional_)
{
}
Derived& operator=(const Derived& d)
{
Base::operat...
惨不忍睹：说一说你最穷的时候是什么样子 - 创意 - 清泛网 - 专注C/C++及内核技术
...道
@EZ汽车人：在北京一个月吃饭花200
@贰拾壹-_- ：拉屎拉一半，怕饿得快。。。。。。
类型二：不敢出门+避免社交型
@螺丝脱落司机：开启免打扰模式，然后各种宅。
@猪脚L:穷到家里待了一个星...
Collection that allows only unique items in .NET?
...T> List
{
get;
private set;
}
List<T> _internalList;
public static UniqueList<T> NewList
{
get
{
return new UniqueList<T>();
}
}
private UniqueList()
{
_internalList = new L...
What is a regular expression which will match a valid domain name without a subdomain?
...many valid edge cases that I have missed):
^((?!-))(xn--)?[a-z0-9][a-z0-9-_]{0,61}[a-z0-9]{0,1}\.(xn--)?([a-z0-9\-]{1,61}|[a-z0-9-]{1,30}\.[a-z]{2,})$
When choosing a domain validation regex, you should see if the domain matches the following:
xn--stackoverflow.com
stackoverflow.xn--com
stackov...
Simple argparse example wanted: 1 argument, 3 results
...ou started.
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("a")
args = parser.parse_args()
if args.a == 'magic.name':
print 'You nailed it!'
But this positional argument is now required. If you leave it out when invoking this program, you'll get an error about missin...
Eclipse: Enable autocomplete / content assist
... Change the default in Auto activation triggers for Java to ._abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ stackoverflow.com/questions/1959946/…
– ftvs
Nov 6 '13 at 3:52
...