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What's the simplest way to test whether a number is a power of 2 in C++?
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(n & (n - 1)) == 0 is best. However, note that it will incorrectly return true for n=0, so if that is possible, you will want to check for it explicitly.
http://www.graphics.stanford.edu/~seander/bithacks.html has a large collection of clever bit-twiddling algorithms, in...
How to assign string to bytes array
... The OP asked about an array, not a slice. In some cases you need to limit the size of the slice and use an array instead. My answer below trims the extra chars to make sure you do not overflow the array.
– DavidG
Feb 14 '16 at 5:17
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Storing integer values as constants in Enum manner in java [duplicate]
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Well, you can't quite do it that way. PAGE.SIGN_CREATE will never return 1; it will return PAGE.SIGN_CREATE. That's the point of enumerated types.
However, if you're willing to add a few keystrokes, you can add fields to your enums, like th...
Removing rounded corners from a element in Chrome/Webkit
...dius of 0px through my external stylesheet, as well inline on the element itself; I've tried both border-radius:0px and -webkit-border-radius:0px; and I've tried the even more specific border-top-left-radius:0px (along with it's -webkit equivalent).
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How to get the current URL within a Django template?
I was wondering how to get the current URL within a template.
10 Answers
10
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if (key in object) or if(object.hasOwnProperty(key)
...ls us), will only return true if key is available on that object directly (its "owns" the property).
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How to install Homebrew on OS X?
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It's on the top of the Homebrew homepage.
From a Terminal prompt:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
The command brew install wget is an example of how to use Homebrew t...
Can't ignore UserInterfaceState.xcuserstate
I'm using Git for Xcode 4 project version control. I've explicitly added ProjectFolder.xcodeproj/project.xcworkspace/xcuserdata/myUserName.xcuserdatad/UserInterfaceState.xcuserstate to .gitignore , but Git it won't ignore it. Any ideas why this is so?
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Create numpy matrix filled with NaNs
...ou rarely need loops for vector operations in numpy.
You can create an uninitialized array and assign to all entries at once:
>>> a = numpy.empty((3,3,))
>>> a[:] = numpy.nan
>>> a
array([[ NaN, NaN, NaN],
[ NaN, NaN, NaN],
[ NaN, NaN, NaN]])
I hav...
Comparison of DES, Triple DES, AES, blowfish encryption for data
...oes anyone have pros and cons together for comparing these encryption algorithms ?
8 Answers
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