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Functional programming - is immutability expensive? [closed]
... Haskell folks have written the fastest algorithms possible either, but at least some of them probably tried! Then again, some of the Haskell calls C libraries....)
Now, suppose you do want a more reasonable benchmark of Quicksort, recognizing that this is probably one of the worst cases for FP vs...
How to create an object for a Django model with a many to many field?
...e_object.users.add(1,2)
Update: After reading the saverio's answer, I decided to investigate the issue a bit more in depth. Here are my findings.
This was my original suggestion. It works, but isn't optimal. (Note: I'm using Bars and a Foo instead of Users and a Sample, but you get the idea).
ba...
Is there a way to detect if an image is blurry?
... Only one point that's hugely important is that you have to know (at least roughly) what your expected pre-blurred image (frequency) content was. This is true since the frequency spectrum is going to be that of the original image times that of the blurring filter. Thus, if the original image a...
Difference between “@id/” and “@+id/” in Android
In @+id/ the plus symbol + instructs to create a new resource name and add in to the R.java file but what about @id/ ? From the documentation of ID : when referencing an Android resource ID , you do not need the plus symbol, but must add the android package namespace, like so:
...
Difference between
...
@BertF, Good clear explanation, at least 3405691582 times better than the explanation at doc.oracle
– Pacerier
Sep 10 '14 at 17:13
9
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Hibernate vs JPA vs JDO - pros and cons of each? [closed]
...ell this is certainly not like the old days where there would have been at least 17 different pro Hibernate FUD posts (yet only coming from 3 different IP addresses. Do the maths people =) ).
– Volksman
Mar 24 '10 at 2:44
...
How to fix Git error: object file is empty?
... way to fix it, please leave a comment. It did, however, work for me... at least temporarily.
Step 1: Make a backup of .git (in fact I do this in between every step that changes something, but with a new copy-to name, e.g. .git-old-1, .git-old-2, etc.):
cp -a .git .git-old
Step 2: Run git fsc...
How come an array's address is equal to its value in C?
...hemeral rvalue (eg. given int a;, it is just like a + 1) - conceptually at least it is "calculated as needed". The real "value" of my_array is the contents of the entire array - it is just that pinning down this value in C is like trying to catch fog in a jar.
– caf
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C++ performance challenge: integer to std::string conversion
...environment. Both of my algorithms suffer from that, but hopman_fast is at least still competetive.
Note that for those the two or so that don't construct a string I added the following function template:
template <typename T>
std::string itostr(T t) {
std::string ret;
itostr(t, ret)...
What exactly is metaprogramming?
...in that code
is there because it has to be. What
that means is that at least 20-25% of
the code in this program is doing
things that you can't easily do in any
other language. However skeptical the
Blub programmer might be about my
claims for the mysterious powers of
Lisp, this ought...