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When should I use the Visitor Design Pattern? [closed]
...virtual void hereIsACat(Cat *c) = 0;
};
Then, we modify the hierarchy in order to accept new operations:
class Animal
{ public: virtual void letsDo(Operation *v) = 0; };
class Dog : public Animal
{ public: void letsDo(Operation *v); };
void Dog::letsDo(Operation *v)
{ v->hereIsADog(this); }
...
How to display an unordered list in two columns?
... contents of the list changes you will need to perform the operation for reordering the list into columns and reprinting. The solution below uses jQuery for brevity.
http://jsfiddle.net/HP85j/19/
HTML:
<div>
<ul class="columns" data-columns="2">
<li>A</li>
...
SAML: Why is the certificate within the Signature?
...me from, and how could you validate it?" - what are you talking about? In order to trust a signature in a SAML message, you must already have a list of trusted public certificates. You could use the Issuer element and store that issuer's certificate against that, and pick that certificate against ...
What is the maven-shade-plugin used for, and why would you want to relocate Java packages?
...Qux's code will not work) or Bar:2.0 (which Foo's code will not work)?
In order to solve this problem, developer of Foo can choose to use shade plugin to rename its usage of Bar, so that all classes in Bar:1.0 jar are embedded in Foo jar, and the package of the embedded Bar classes is changed from ...
Rails extending ActiveRecord::Base
... end
# add your static(class) methods here
class_methods do
#E.g: Order.top_ten
def top_ten
limit(10)
end
end
end
# include the extension
ActiveRecord::Base.send(:include, ActiveRecordExtension)
Create a file in the config/initializers directory called extensions...
Howto: Clean a mysql InnoDB storage engine?
...
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scala vs java, performance and memory? [closed]
...guages Benchmark Game Scala code is written in a rather Java-like style in order to get Java-like performance, and thus has Java-like memory usage. You can do this in Scala: if you write your code to look like high-performance Java code, it will be high-performance Scala code. (You may be able to ...
Functional design patterns [closed]
...s.
Chapters 11-13 cover Functors, Applicative Functors and Monads, in that order. This is helpful - many tutorials introduce Functors and then Monads, and then tack Applicative Functors on at the end (if they cover it at all). The order in LYAH is better, because moving from Functors => Applicati...
Sorting a list using Lambda/Linq to objects
...n direction)
{
if (direction == SortDirection.Ascending)
list = list.OrderBy(sorter);
else
list = list.OrderByDescending(sorter);
}
Now you can specify the field to sort when calling the Sort method.
Sort(ref employees, e => e.DOB, SortDirection.Descending);
...
Why would a static nested interface be used in Java?
...
An inner interface has to be static in order to be accessed. The interface isn't associated with instances of the class, but with the class itself, so it would be accessed with Foo.Bar, like so:
public class Baz implements Foo.Bar {
...
}
In most ways, this ...