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dealloc in Swift
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334
deinit {
// perform the deinitialization
}
From the Swift Documentation:
A deinitial...
Why can't the C# constructor infer type?
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133
Is there a philosophical reason why the constructor can't support type inference?
No. When...
Comparing two collections for equality irrespective of the order of items in them
...oreach (T val in enumerable.OrderBy(x => x))
hash = hash * 23 + (val?.GetHashCode() ?? 42);
return hash;
}
}
Sample usage:
var set = new HashSet<IEnumerable<int>>(new[] {new[]{1,2,3}}, new MultiSetComparer<int>());
Console.WriteLine(set.Contains(new [...
What does the “@” symbol mean in reference to lists in Haskell?
...list's tail: pt
Without the @, you'd have to choose between (1) or (2):(3).
This syntax actually works for any constructor; if you have data Tree a = Tree a [Tree a], then t@(Tree _ kids) gives you access to both the tree and its children.
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How do you execute an arbitrary native command from a string?
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323
Invoke-Expression, also aliased as iex. The following will work on your examples #2 and #3:
i...
Inheriting from a template class in c++
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celtschkceltschk
17.7k22 gold badges3232 silver badges6161 bronze badges
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promise already under evaluation: recursive default argument reference or earlier problems?
...instances where they occur we get:
f <- function(x, T) {
10 * sin(0.3 * x) * sin(1.3 * x^2) + 0.001 * x^3 + 0.2 * x + 80
}
g <- function(x, T, f. = f) { ## 1. note f.
exp(-f.(x)/T)
}
test<- function(g. = g, T = 1) { ## 2. note g.
g.(1,T)
}
test()
## [1] 8.560335e-37
...
Java how to replace 2 or more spaces with single space in string and delete leading and trailing spa
... String[] tests = {
" x ", // [x]
" 1 2 3 ", // [1 2 3]
"", // []
" ", // []
};
for (String test : tests) {
System.out.format("[%s]%n",
test.replaceAll("^ +| +$|( )+", "$1")
);
}
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How do I get a class instance of generic type T?
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answered Aug 9 '10 at 7:03
Zsolt TörökZsolt Török
9,11522 gold badges2222 silver badges2424 bronze badges
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Checking for empty arrays: count vs empty
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23
@prodigitalson I would say that count is O(1), since PHP stores the number of elements internally. Check out this answer stackoverflow.com/a...