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What is PECS (Producer Extends Consumer Super)?
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tl;dr: "PECS" is from the collection's point of view. If you are only pulling items from a generic collection, it is a producer and you should use extends; if you are only stuffing items in, it is a consumer and you should use super. If you d...
What does auto&& tell us?
...ther an lvalue or an rvalue, your code says: Now that I've got your object from either an lvalue or rvalue expression, I want to preserve whichever valueness it originally had so I can use it most efficiently - this might invalidate it. As in:
auto&& var = some_expression_that_may_be_rvalue...
Undoing accidental git stash pop
...sh commits with git fsck --no-reflog | awk '/dangling commit/ {print $3}' (from the link), and I just manually found the problem from that diff. Thanks!
– nren
Jul 1 '11 at 5:01
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In Python, using argparse, allow only positive integers
...nt('foo', type=check_positive)
This is basically just an adapted example from the perfect_square function in the docs on argparse.
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How to determine if a list of polygon points are in clockwise order?
...ave to link the last point to the first one. If you have N points numbered from 0 to N-1, then you must calculate: Sum( (x[(i+1) mod N] - x[i]) * (y[i] + y[(i+1) mod N]) ) for i = 0 to N-1. I.e., must must take the index Modulo N (N ≡ 0) The formula works only for closed polygons. Polygons have no...
Django - “no module named django.core.management”
I get the following error when trying to run Django from the command line.
21 Answers
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Which commit has this blob?
... of the blob. A prefix, even if unique, will not work. To get the full SHA from a prefix, you can use git rev-parse --verify $theprefix
– John Douthat
Aug 2 '11 at 23:05
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How do I exit a WPF application programmatically?
...supposed to exit my application when the user clicks on the Exit menu item from the File menu.
16 Answers
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Unable to load DLL (Module could not be found HRESULT: 0x8007007E)
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From what I remember on Windows the search order for a dll is:
Current Directory
System folder, C:\windows\system32 or c:\windows\SysWOW64 (for 32-bit process on 64-bit box).
Reading from the Path environment variable
In ...
Why rgb and not cmy? [closed]
...lable as a primary colour. In that case you need to be able to produce red from the three colours that you have and the combination Magenta + Yellow is what makes a colour closest to Red.
– Bazzz
Feb 3 at 13:00
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