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Why covariance and contravariance do not support value type
...hout any change in representation; the native code itself doesn't need to know what you're doing with the values at all, so long as the infrastructure has guaranteed that it will definitely be valid.
For value types, that doesn't work - to treat an IEnumerable<int> as an IEnumerable<object...
How can I create a copy of an object in Python?
...
@AaronHall Thanks for letting me know! This certainly isn't the greatest answer I wrote, but I kind of agree with the decision that it should not be forcibly deleted. I'll brush it up a bit, but since there are already answers with all the details (notably yo...
Efficiency of Java “Double Brace Initialization”?
... }});
}};
return source;
}
}
The returned Map will now contain a reference to the enclosing instance of ReallyHeavyObject. You probably don't want to risk that:
Image from http://blog.jooq.org/2014/12/08/dont-be-clever-the-double-curly-braces-anti-pattern/
3. You can pret...
Skip List vs. Binary Search Tree
I recently came across the data structure known as a skip list . It seems to have very similar behavior to a binary search tree.
...
What is the difference between the Data Mapper, Table Data Gateway (Gateway), Data Access Object (DA
...ulate the database logic for a specific entity so the calling code has no knowledge of the underlying persistence layer. From my brief research all of them typically implement your standard CRUD methods and abstract away the database-specific details.
...
What is 'Pattern Matching' in functional languages?
...a functional language, the datatypes that you define are usually what are known as discriminated unions or algebraic data types. For instance, what's a (linked) list? A linked list List of things of some type a is either the empty list Nil or some element of type a Consed onto a List a (a list of...
Why it's not possible to use regex to parse HTML/XML: a formal explanation in layman's terms
... closing tags match a previous opening tag. To understand it, you need to know which element is being closed. Without any means to "remember" what opening tags you've seen, no chance.
Note however that most "regex" libraries actually permit more than just the strict definition of regular expression...
What is the difference between C# and .NET?
May I know what is the difference between C# and .NET? When I think of C#, right away I would say it is a .NET language, but when I search for job posts, they require candidates to have C# and .NET experience. Can someone give me an explanation?
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Is it possible to cache POST methods in HTTP?
...nse regardless of the headers. IE behaves more smartly in this respect.
Now, i want to clear up some confusion here regarding RFC 2616 S. 13.10. POST method on a URI doesn't "invalidate the resource for caching" as some have stated here. It makes a previously cached version of that URI stale, ev...
What's the right OAuth 2.0 flow for a mobile app
... identity features that browsers have
makes it impossible for the user to know if they are signing in to the
legitimate site, and even when they are, it trains them that it's OK
to enter credentials without validating the site first.
Aside from the security concerns, web-views do not share the
authe...