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When should I use the Visitor Design Pattern? [closed]
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(Suppose it is a complex hierarchy with a well-established interface.)
Now we want to add a new operation to the hierarchy, namely we want each animal to make its sound. As far as the hierarchy is this simple, you can do it with straight polymorphism:
class Animal
{ public: virtual void makeSou...
How to create P12 certificate for iOS distribution
... convert the PEM to P12, it wants a private key of some sort, and I don't know where to get it.
7 Answers
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How to write to Console.Out during execution of an MSTest test
...thod]
public void TestMethod1()
{
Debug.WriteLine("Time {0}", DateTime.Now);
System.Threading.Thread.Sleep(30000);
Debug.WriteLine("Time {0}", DateTime.Now);
}
Output
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How to concatenate two numbers in javascript?
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You can now make use of ES6 template literals.
const numbersAsString = `${5}${6}`;
console.log(numbersAsString); // Outputs 56
Or, if you have variables:
const someNumber = 5;
const someOtherNumber = 6;
const numbersAsString = `...
Why are Where and Select outperforming just Select?
...);
int result2 = myCollection.Sum(mc => mc.IsValid ? mc.Value : 0);
Now here's the kicker:
LINQ uses deferred execution. Thus, while it may appear that result1 iterates over the collection twice, it actually only iterates over it once. The Where() condition is actually applied during the S...
Simplest way to serve static data from outside the application server in a Java web application
...n the response, you should set the Content-Type header so that the client knows which application to associate with the provided file. And, you should set the Content-Length header so that the client can calculate the download progress, otherwise it will be unknown. And, you should set the Content-D...
Convert list to tuple in Python
...nce you have used a tuple variable to hold a tuple (45, 34) earlier... So, now tuple is an object of type tuple now...
It is no more a type and hence, it is no more Callable.
Never use any built-in types as your variable name... You do have any other name to use. Use any arbitrary name for your va...
Installing PDO driver on MySQL Linux server
...php.ini file and it looks like pdo in enabled by default, i still need to know if i can use both pdo and mysql_*handlers...
– Yuri Scarbaci
Nov 14 '12 at 8:18
1
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Disable firefox same origin policy
...om here
(mirror, may not be updated).
Or download the files from GitHub.
Now it's also on Firefox Marketplace: Download here. In this case, the addon is installed after you click install and you can skip to step 4.
If you downloaded the xpi you can jump to step 3. If you downloaded the zip from G...
Does Foreign Key improve query performance?
...pretty much useless because it doesn't answer the question. It's great to know that foreign keys are not intended to have a (positive) effect on performance, but the question was concerning reality, not intentions.
– John
Mar 15 '17 at 16:04
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