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Why do x86-64 systems have only a 48 bit virtual address space?
...s a lot. You're not going to see a system which needs more than that any time soon.
So CPU manufacturers took a shortcut. They use an instruction set which allows a full 64-bit address space, but current CPUs just only use the lower 48 bits. The alternative was wasting transistors on handling a big...
What character to use to put an item at the end of an alphabetic list?
I often prepend ' _ ' to the item I want in first position.
Is there some sort of magical character I could use to put an item at the end of the list?
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How to configure Git post commit hook
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As mentioned in "Polling must die: triggering Jenkins builds from a git hook", you can notify Jenkins of a new commit:
With the latest Git plugin 1.1.14 (that I just release now), you can now do this more >easily by simpl...
postgresql port confusion 5433 or 5432?
.../services is only advisory, it's a listing of well-known ports. It doesn't mean that anything is actually running on that port or that the named service will run on that port.
In PostgreSQL's case it's typical to use port 5432 if it is available. If it isn't, most installers will choose the next fr...
iOS 7 style Blur view
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You might be able to modify something like Bin Zhang's RWBlurPopover to do this. That component uses my GPUImage to apply a Gaussian blur to components underneath it, but you could just as easily use a CIGaussianBlur for the same. GPUImage might be a hair...
Is there a standard sign function (signum, sgn) in C/C++?
.../wiki/Sign_function
It's easy enough to write my own, but it seems like something that ought to be in a standard library somewhere.
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How do I set the table cell widths to minimum except last column?
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Can I access constants in settings.py from templates in Django?
I have some stuff in settings.py that I'd like to be able to access from a template, but I can't figure out how to do it. I already tried
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Drag and drop files into WPF
...ent in XAML, as well as setting the AllowDrop attribute.
<StackPanel Name="ImagePanel" Drop="ImagePanel_Drop" AllowDrop="true">
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</StackPanel>
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How do I determine the size of my array in C?
...omputer, ints are 4 bytes long, so n is 68.
To determine the number of elements in the array, we can divide
the total size of the array by the size of the array element.
You could do this with the type, like this:
int a[17];
size_t n = sizeof(a) / sizeof(int);
and get the proper answer (68 / 4 =...