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Why should I use a pointer rather than the object itself?
...an object. The main difference is the storage duration of the object. When doing Object myObject; within a block, the object is created with automatic storage duration, which means it will be destroyed automatically when it goes out of scope. When you do new Object(), the object has dynamic storage ...
How efficient is locking an unlocked mutex? What is the cost of a mutex?
...x? I.e. how much assembler instructions are there likely and how much time do they take (in the case that the mutex is unlocked)?
The precise assembler instructions are the least overhead of a mutex - the memory/cache coherency guarantees are the main overhead. And less often a particular lock is ...
What is a semaphore?
...ghtclub.", args);
Bouncer.WaitOne();
// Do some dancing.
Console.WriteLine("Guest {0} is doing some dancing.", args);
Thread.Sleep(500);
// Let one guest out (release one semaphore).
Console.WriteLine("Guest {0} is l...
Difference between SurfaceView and View?
... simple. Check pierr's answer; it has a link to the detailed architecture doc (source.android.com/devices/graphics/architecture.html), and explains why hardware acceleration of Canvas rendering can make custom Views a better choice.
– fadden
Dec 1 '14 at 17:09...
git rebase: “error: cannot stat 'file': Permission denied”
...base to squash the two commits together before pushing them. (I've never done this before.)
33 Answers
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UITableViewCell Separator disappearing in iOS7
...s, this is exactly what I needed, I added it in a category, so now after I do [tableView reloadData], if this bug happens (in my case the footer separator that was hidden is reappearing), I call [tableView reloadSeparators];
– NiñoScript
Apr 5 '14 at 4:56
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What is the relation between BLAS, LAPACK and ATLAS
I don't understand how BLAS, LAPACK and ATLAS are related and how I should use them together! I have been looking through all of their manuals and I have a general idea of BLAS and LAPACK and how to use them with the very few examples I find, but I can't find any actual examples using ATLAS to see h...
How to skip “Loose Object” popup when running 'git gui'
...e the code which shows up that dialog. I found the hint_gc procedure which does it and the place where it is called. At the same time I noticed that late 2011 there was added a configuration option for disabling the dialog. This change (part of git-gui 0.16.0) was merged to Git's mainline on 2011-12...
Is there a way to “autosign” commits in Git with a GPG key?
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Note: if you don't want to add -S all the time to make sure your commits are signed, there is a proposal (branch 'pu' for now, December 2013, so no guarantee it will make it to a git release) to add a config which will take care of that o...
How to convert string into float in JavaScript?
...numbers after the comma. I've tried parseInt and parseFloat . How can I do this?
8 Answers
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