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Single Line Nested For Loops
...ertools.product, which returns an iterable yielding tuples of values from all the iterables you pass it. That is, itertools.product(A, B) yields all values of the form (a, b), where the a values come from A and the b values come from B. For example:
import itertools
A = [50, 60, 70]
B = [0.1, 0.2...
Use C++ with Cocoa Instead of Objective-C?
... superset of C. In Objective-C++, you can make objc-style message passing calls (like [some-objc-object callMethod];) from within a C++ function. Conversely, you can call C++ functions from within ObjC code like:
@interface MyClass {
MyCPPClass *cppInstance;
}
@end
@implementation MyClass
- (i...
What exactly is a C pointer if not a memory address?
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The C standard does not define what a pointer is internally and how it works internally. This is intentional so as not to limit the number of platforms, where C can be implemented as a compiled or interpreted language.
A pointer value can be some kind of ID or handle or a combin...
Implications of foldr vs. foldl (or foldl')
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@Desty because it produces new part of its overall result on each step -- unlike foldl, which collects its overall result and produces it only after all the work is finished and there are no more steps to perform. So e.g. foldl (flip (:)) [] [1..3] == [3,2,1], so scanl (f...
Is there any advantage of using map over unordered_map in case of trivial keys?
... unordered_map.
Something else to keep in mind is that unordered_map generally uses more memory. map just has a few house-keeping pointers, and memory for each object. Contrarily, unordered_map has a big array (these can get quite big in some implementations), and then additional memory for each ob...
How to make the 'cut' command treat same sequental delimiters as one?
... characters to tab. For example: I came here looking for a way to automatically export my display: who am i | tr -s ' ()' '\t' | cut -f5
– Leo
Mar 28 '16 at 23:24
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Git add all files modified, deleted, and untracked?
Is there a way to add all files no matter what you do to them whether it be deleted, untracked, etc? like for a commit. I just don't want to have to git add or git rm all my files every time I commit, especially when I'm working on a large product.
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How can I parse a YAML file from a Linux shell script?
...:// (for URLs)
s/$/"/g appends " to the end of each line
s/ *=/=/g removes all spaces before =
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Could not locate Gemfile
...application on my server using Ruby, Gems, and Bundler. I am trying to install another Ruby on under a different user account but on the same VPS. When I go to run
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How to delete an SMS from the inbox in Android programmatically?
... onReceive() method, before performing anything with your message, simply call abortBroadcast();
EDIT: As of KitKat, this doesn't work anymore apparently.
EDIT2: More info on how to do it on KitKat here:
Delete SMS from android on 4.4.4 (Affected rows = 0(Zero), after deleted)
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