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When should you use constexpr capability in C++11?
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Suppose it does something a little more complicated.
constexpr int MeaningOfLife ( int a, int b ) { return a * b; }
const int meaningOfLife = MeaningOfLife( 6, 7 );
Now you have something that can be evaluated down to a constant while...
Parse config files, environment, and command-line arguments, to get a single collection of options
...ommand-line argument parsing ( argparse ). I want to write a program that does all those, and also:
11 Answers
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What does the thread_local mean in C++11?
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Using thread local doesn't solve the problems with strtok. strtok is broken even in a single threaded environment.
– James Kanze
Aug 16 '12 at 10:15
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drag drop files into standard html file input
...tly what I was looking for. Didn't work 2 years ago. Awesome! Of course it doesn't work in IE =) The important question: is there reliable feature detection?, so you can hide the dropzone in IE, bc it won't work.
– Rudie
Aug 17 '16 at 9:57
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Static methods in Python?
...arer.
The following is verbatim from the documentation::
A static method does not receive an implicit first argument. To declare a static method, use this idiom:
class C:
@staticmethod
def f(arg1, arg2, ...): ...
The @staticmethod form is a function decorator – see the description of fu...
Does anyone know what the new Exit icon is used for when editing storyboards using Xcode 4.5?
...ction to any IB elements or corresponding source files. Docs give no love. Doesn't appear in nib files, only storyboards. My assumption is that it's a corollary to segues, but I don't see any new methods to back it up. Anyone?
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What does the “~” (tilde/squiggle/twiddle) CSS selector mean?
...lector
ul ~ ul - Looking outside - Selects all the ul which follows the ul doesn't matter where it is, but both ul should be having the same parent; General Sibling Selector
The one we are looking at here is General Sibling Selector
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ERROR 1452: Cannot add or update a child row: a foreign key constraint fails
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You are getting this constraint check because Ordre table does not have reference OrdreID provided in insert command.
To insert value in Ordrelinje, you first have to enter value in Ordre table and use same OrdreID in Orderlinje table.
Or you can remove not null constraint and ins...
What does .SD stand for in data.table in R
.SD looks useful but I do not really know what I am doing with it. What does it stand for? Why is there a preceding period (full stop). What is happening when I use it?
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Explicitly calling return in a function or not
...nd. Instead, it’s: “why should I use a redundant return? Which benefit does it provide?” As it turns out, the answer is “not much”, or even “none whatsoever”. Your reply fails to appreciate this.
– Konrad Rudolph
Mar 29 '17 at 9:44
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