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How do I check for nulls in an '==' operator overload without infinite recursion?
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Cast to object in the overload method:
public static bool operator ==(Foo foo1, Foo foo2) {
if ((object) foo1 == null) return (object) foo2 == null;
return foo1.Equals(foo2);
}
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Double not (!!) operator in PHP
... you will get the boolean value FALSE.
It is functionally equivalent to a cast to boolean:
return (bool)$row;
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What is Type-safe?
...hon)), some of them will actually give you a runtime error on invalid type casting.
While its convenient, it opens you up to a lot of errors that can be easily missed, and only identified by testing the running program. Personally, I prefer to have my compiler tell me if I made that mistake.
Now, ...
Java: how do I get a class literal from a generic type?
...pe erasure.
Java generics are little more than syntactic sugar for Object casts. To demonstrate:
List<Integer> list1 = new ArrayList<Integer>();
List<String> list2 = (List<String>)list1;
list2.add("foo"); // perfectly legal
The only instance where generic type information...
Get value of c# dynamic property via string
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-1. This only work with simple .NET objects that were casted to dynamic. It will not work with any custom dynamic object like Expando or ViewBag used ASP.NET MVC
– Philipp Munin
Jan 28 '15 at 19:12
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Can you get the column names from a SqlDataReader?
...lumns = reader.GetSchemaTable().Rows
.Cast<DataRow>()
.Select(r => (string)r["ColumnName"])
.ToList();
//Or
var columns = Enumerable.Range(0, reader.FieldCount)
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Java: Instanceof and Generics
...(Object o) {
try {
abstractMethod((T) o);
} catch (ClassCastException e) {
//...
You are casting the object to T (your generic type), just to fool the compiler. Your cast does nothing at runtime, but you will still get a ClassCastException when you try to pass the wrong type of...
What is the !! (not not) operator in JavaScript?
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An easy way to describe it is: Boolean(5) === !!5; Same casting, fewer characters.
– Micah Snyder
Apr 24 '09 at 18:27
43
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How do I convert a string to enum in TypeScript?
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So we can use typecast: let s = "Green"; let typedColor = <keyof typeof Color> s;
– SergeyT
Jun 8 '17 at 13:06
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Why does integer division in C# return an integer and not a float?
... it, and that every time you do division you'll always need to remember to cast to floating points, you are mistaken.
First off, integer division is quite a bit faster, so if you only need a whole number result, one would want to use the more efficient algorithm.
Secondly, there are a number of al...