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RE error: illegal byte sequence on Mac OS X
...that most Unix utilities that process file do not, and usually break or at least misbehave when faced with one. Without a BOM, file correctly identifies an all-7-bit bytes file as ASCII, and one that has valid UTF-8 multi-byte characters as UTF-8. The beauty of UTF-8 is that it is a superset of ASCI...
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...
Swift and mutating struct
...r with proper performance. They may add this feature later, but not now at least.
For Objective-C programmers, mutable/immutable concepts are very familiar. In Objective-C we had two separated classes for each concept, but in Swift, you can do this with one struct. Half work.
For C/C++ programmers...
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...
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
...
mongodb group values by multiple fields
...ems to $push to an array.
db.books.aggregate([
{ "$group": {
"_id": {
"addr": "$addr",
"book": "$book"
},
"bookCount": { "$sum": 1 }
}},
{ "$group": {
"_id": "$_id.addr",
"books": {
"$push": {
"...
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 to efficiently build a tree from a flat structure?
I have a bunch of objects in a flat structure. These objects have an ID and a ParentID property so they can be arranged in trees. They are in no particular order.
Each ParentID property does not necessarily matches with an ID in the structure. Therefore their could be several trees emerging ...
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)...