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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
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Generically, a covariant type parameter is one which is allowed to vary down as the class is subtyped (alternatively, vary with subtyping, hence the "co-" prefix). More concretely:
trait List[+A]
List[Int] is a subtype of List[A...
Covariance, Invariance and Contravariance explained in plain English?
... say it is used to decide whether a method is overwritten or overloaded.
All of the above.
At heart, these terms describe how the subtype relation is affected by type transformations. That is, if A and B are types, f is a type transformation, and ≤ the subtype relation (i.e. A ≤ B means that ...
Differences between ExpandoObject, DynamicObject and dynamic
...c keyword to interact with a normal instance, the DLR performs late-bound calls to the instance's normal methods.
The IDynamicMetaObjectProvider interface allows a class to take control of its late-bound behavior.
When you use the dynamic keyword to interact with an IDynamicMetaObjectProvider imple...
Rebasing and what does one mean by rebasing pushed commits
...al to rebase again after another developer changes topic branch. Essentially, I have been using merge for quite sometime, but we are in same boat as, darwinweb.net/articles/86 and the history is almost unusable.
– Hemant Kumar
Apr 26 '10 at 18:13
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What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
...emember this when you create and access an array.
Array Length
In C#, usually, arrays are 0-based. It means that first element has index 0 and last element has index Length - 1 (where Length is total number of items in the array) so this code doesn't work:
array[array.Length] = 0;
Moreover plea...
When is an interface with a default method initialized?
...ough to trigger the initialization. The default method doesn't have to be called or overridden or even mentioned, nor does the presence of an abstract method trigger initialization.
My speculation is that the HotSpot implementation wanted to avoid adding class/interface initialization checking into...
Parsing JSON using Json.net
... @Marc Gravell: Thanks a lot! I knew nothing about JSon. But this example allowed me easily create configuration file (with hierarchical structure) for my application.
– Peter17
Apr 7 '11 at 15:17
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How to style a checkbox using CSS
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OLDER ANSWER
Here's a useful article about styling checkboxes. Basically, that writer found that it varies tremendously from browser to browser, and that many browsers always display the default checkbox no matter how you style it. So there really isn't an easy way.
It's not hard to imagine ...
Does PostgreSQL support “accent insensitive” collations?
...ch dictionary that removes accents (diacritic
signs) from lexemes.
Install once per database with:
CREATE EXTENSION unaccent;
If you get an error like:
ERROR: could not open extension control file
"/usr/share/postgresql/<version>/extension/unaccent.control": No such file or directory
...
Is a `=default` move constructor equivalent to a member-wise move constructor?
... decl-specifier-seqopt declarator virt-specifier-seqopt = default ;
is called an explicitly-defaulted definition. A function that is explicitly defaulted shall
be a special member function,
have the same declared function type (except for possibly differing ref-qualifiers and except that in the...