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When to use std::forward to forward arguments?
...e potentially moving the argument all the way through to the final caller, and once it's moved it's gone, so you cannot then use it again (in the way you probably meant to).
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How can I get this ASP.NET MVC SelectList to work?
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nice. I've added a selected Func, a defaultValue option and a second overload without any defaults to specify and this works a treat. By the way if you want to make the return type IEnumerable<SelectListItem> you can use the yield return syntax to make this look really clea...
Multiple submit buttons in an HTML form
Let's say you create a wizard in an HTML form. One button goes back, and one goes forward. Since the back button appears first in the markup when you press Enter , it will use that button to submit the form.
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Why Doesn't C# Allow Static Methods to Implement an Interface?
...property, which would still allow it to be accessed from a static context, and return that value in the implementation.
public class Animal: IListItem {
/* Can be tough to come up with a different, yet meaningful name!
* A different casing convention, like Java has, would help here.
*...
How to define “type disjunction” (union types)?
...: String => println("str")
case _: Int => println("int")
}
}
And that's it. You can call foo(5) or foo("abc"), and it will work, but try foo(true) and it will fail. This could be side-stepped by the client code by creating a StringOrInt[Boolean], unless, as noted by Randall below, you ...
LINQ to Entities only supports casting EDM primitive or enumeration types with IEntity interface
... Perfect, it's great being able to perform Interface-based queries and still maintain the collection as IQueryable. A bit annoying however that there is basically no way of thinking up this fix, without knowing the inner workings of EF.
– Anders
Dec 9 '...
Get list of JSON objects with Spring RestTemplate
...ntroller methods.
In RestTemplate this class is returned by getForEntity() and exchange().
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Obtaining a powerset of a set in Java
...2^n possible combinations. Here's a working implementation, using generics and sets:
public static <T> Set<Set<T>> powerSet(Set<T> originalSet) {
Set<Set<T>> sets = new HashSet<Set<T>>();
if (originalSet.isEmpty()) {
sets.add(new HashS...
Side-by-side plots with ggplot2
...ut as an alternative to grid.arrange. See the answer by @claus-wilke below and this vignette for an equivalent approach; but the function allows finer controls on plot location and size, based on this vignette.
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Listing all permutations of a string/integer
...from my experience of interviews though) is to take a string or an integer and list every possible permutation.
28 Answers
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