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Case objects vs Enumerations in Scala
Are there any best-practice guidelines on when to use case classes (or case objects) vs extending Enumeration in Scala?
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What are some compelling use cases for dependent method types?
...uently, in the absence of dependent method types, attempts to use them outside of that instance can be frustratingly difficult. This can turn designs which initially seem elegant and appealing into monstrosities which are nightmarishly rigid and difficult to refactor.
I'll illustrate that with an e...
What is pseudopolynomial time? How does it differ from polynomial time?
... when we start talking about algorithms that operate on numbers. Let's consider the problem of testing whether a number is prime or not. Given a number n, you can test if n is prime using the following algorithm:
function isPrime(n):
for i from 2 to n - 1:
if (n mod i) = 0, return false...
Why not use always android:configChanges=“keyboardHidden|orientation”?
I was wondering why not use android:configChanges="keyboardHidden|orientation" in every (almost every ;)) activity?
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How is this fibonacci-function memoized?
...cases where we don't want it to do that for us automatically.
(edit:) Consider these re-writes:
fib1 = f fib2 n = f n fib3 n = f n
where where where
f i = xs !! i f i = xs ...
git rebase, keeping track of 'local' and 'remote'
... when resolving conflicts. I sometimes have the impression that they swap sides from one commit to the next.
4 Answers
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Why can't I initialize non-const static member or static array in class?
...ws only static constant integral or enumeration types to be initialized inside the class. This is the reason a is allowed to be initialized while others are not.
Reference:
C++03 9.4.2 Static data members
§4
If a static data member is of const integral or const enumeration type, its declaratio...
Git - Difference Between 'assume-unchanged' and 'skip-worktree'
...hows up when i do 'git status' as something to be staged. I would like to hide this particular change and not commit it. I won't make any other changes to the file.
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git merge: apply changes to code that moved to a different file
... but my colleague moved that code to a new file in his branch. So when I did git merge my_branch his_branch , git did not notice that the code in the new file was the same as the old, and so none of my changes are there.
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Transaction isolation levels relation with locks on table
...implementation and the algorithm they use: MVCC or Two Phase Locking.
CUBRID (open source RDBMS) explains the idea of this two algorithms:
Two-phase locking (2PL)
The first one is when the T2 transaction tries to change the A record,
it knows that the T1 transaction has already cha...