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Is the practice of returning a C++ reference variable evil?
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@Mark: Yes, it does have some strange rules. A temporary's lifetime can only be extended by initialising a const reference (that is not a class member) with it; it then lives until the ref goes out of scope. Sadly, returning a const ref is ...
Opposite of %in%: exclude rows with values specified in a vector
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Using negate from purrr also does the trick quickly and neatly:
`%not_in%` <- purrr::negate(`%in%`)
Then usage is, for example,
c("cat", "dog") %not_in% c("dog", "mouse")
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Code Golf: Collatz Conjecture
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Python - 95 64 51 46 char
Obviously does not produce a stack overflow.
n=input()
while n>1:n=(n/2,n*3+1)[n%2];print n
share
edited ...
How default .equals and .hashCode will work for my classes?
...ch as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming ...
Entity Framework select distinct name
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Maybe a daft question, but does this return all addresses to the C# code layer and then filter them, or does this pass the appropriate query to the database server to return only the unique values?
– D. A.
Jun 20 ...
Using Rails 3.1, where do you put your “page specific” JavaScript code?
To my understanding, all of your JavaScript gets merged into 1 file. Rails does this by default when it adds //= require_tree . to the bottom of your application.js manifest file.
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A definitive guide to API-breaking changes in .NET
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subqestion to this answer: does anybody know the implication of adding a dotnet4 defaultvalue 'public static void bar(int i = 0);' or changing that defaultvalue from one value to an other?
– k3b
Jan 22 '11 at 9:0...
How to add “active” class to Html.ActionLink in ASP.NET MVC
...g to add an"active" class to my bootstrap navbar in MVC, but the following doesn't show the active class when written like this:
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How to “properly” create a custom object in JavaScript?
...his.y;
};
Now to subclass it, in as much as you can call what JavaScript does subclassing. We do that by completely replacing that weird magic prototype property:
function Circle(x, y, r) {
Shape.call(this, x, y); // invoke the base class's constructor function to take co-ords
this.r= r;
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Why not use always android:configChanges=“keyboardHidden|orientation”?
...he locale has changed), your activity will be restarted in the same way it does by an orientation change. If you want you can view a list of all the different types of config changes.
Edit: More importantly, though, as hackbod points out in the comments, your activity will also be restarted when yo...