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When and why should I use fragments in Android applications? [duplicate]
...self the following questions:
Is the lifecycle of the fragment different from the activity's lifecycle?
If the lifecycle is different, you get better handling of the lifecycle using a fragment. For example, if you want to destroy the fragment, but not the activity. Such is the case, when you hav...
Rails update_attributes without save?
...Your example is a little bit misleading since you haven't pasted this line from the model: attr_accessible :is_admin, :as => :admin ;)
– Robin
Sep 5 '12 at 16:12
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How to Deal with Temporary NSManagedObject instances?
...s in other contexts. To get around this use objectID's, to get the object from the child context. eg.
NSManagedObjectID *mid = [myManagedObject objectID];
MyManagedObject *mySafeManagedObject = [childContext objectWithID:mid];
object.relationship=mySafeManagedObject;
Note, saving the child cont...
Remove .php extension with .htaccess
... trailing slashes (Part 1)
I would like to remove all trailing slashes from pages
I'm not sure why you would want to do this as the rewrite guide includes an example for the exact opposite, i.e., always including a trailing slash. The docs suggest that removing the trailing slash has great pot...
What is Bit Masking?
...; value;
}
Here is a fairly common use-case: Extracting individual bytes from a larger word. We define the high-order bits in the word as the first byte. We use two operators for this, &, and >> (shift right). This is how we can extract the four bytes from a 32-bit integer:
void more_...
Git - Difference Between 'assume-unchanged' and 'skip-worktree'
...et --hard or the like), it will pretend it has not been, using the version from the index instead. This persists until the index is discarded.
There is a good summary of the ramifications of this difference and the typical use cases here: http://fallengamer.livejournal.com/93321.html .
From that a...
Has anyone actually implemented a Fibonacci-Heap efficiently?
...'s libboost-dev package) still had the bugs; I had to pull a clean version from the Subversion repository.
Since version 1.49 Boost C++ libraries added a lot of new heaps structs including fibonacci heap.
I was able to compile dijkstra_heap_performance.cpp against a modified version of dijkstra_s...
Getting one value from a tuple
Is there a way to get one value from a tuple in Python using expressions?
2 Answers
2
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Remove blank lines with grep
I tried grep -v '^$' in Linux and that didn't work. This file came from a Windows file system.
14 Answers
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How does password salt help against a rainbow table attack?
...n later "update" it with some salt. You have to take the salt into account from the beginning.
This is the whole reason for why you need a rainbow table in the first place. Because you cannot get to the password from the hash, you precompute all the hashes of the most likely used passwords and then ...