You should just be able to use the overloads of Enums ToString method to give it a format string, this will print out the value of the enum as a string. public static class Program { static void Main(string[] args) { var val = Urgency.High; Console.WriteLine(val.ToString(“D”)); } } public enum Urgency { VeryHigh = 1, … Read more
It means you return by reference, which is, at least in this case, probably not desired. It basically means the returned value is an alias to whatever you returned from the function. Unless it’s a persistent object it’s illegal. For example: int& foo () { static int x = 0; return x; } //… int … Read more
Why not just change it to int foo(int x, y) { if (y == 0) throwException(“Doh!”); return x/y; } This gives the same runtime results, and the compiler won’t complain.
I create various return types using enum. It doesn’t defined automatically. That implementation look like factory pattern. public enum SmartReturn { IntegerType, DoubleType; @SuppressWarnings(“unchecked”) public <T> T comeback(String value) { switch (this) { case IntegerType: return (T) Integer.valueOf(value); case DoubleType: return (T) Double.valueOf(value); default: return null; } } } Unit Test: public class MultipleReturnTypeTest { … Read more
It’s perfectly safe, and it’s not wrong to do so. Also: it does not vary by compiler. Usually, when (like your example) your struct is not too big I would argue that this approach is even better than returning a malloc’ed structure (malloc is an expensive operation).
From the Kotlin KEEP: The rationale behind these limitations is that future versions of Kotlin may expand and/or change semantics of functions that return Result type and null-safety operators may change their semantics when used on values of Result type. In order to avoid breaking existing code in the future releases of Kotin and leave … Read more
The canonical example is a .clone()/.copy() method. So you can always do obj = obj->copy(); regardless what obj’s type is. Edit: This clone method would be defined in the Object base class (as it actually is in Java). So if clone wasn’t covariant, you would either have to cast, or would be restricted to methods … Read more
Your code has undefined behavior. It may or may not work as you expect. The reason it has undefined behavior is because of 20.8.11.2.1 [func.wrap.func.con]/p7: Requires: F shall be CopyConstructible. f shall be Callable (20.8.11.2) for argument types ArgTypes and return type R. For f to be Callable for return type R, f must return … Read more
PHP 7.1 Now supports nullable return types. The first RFC I linked to is the one they went for: function nullOrString(int $foo) : ?string { return $foo%2 ? “odd” : null; } old answer: Since my comment was actually an answer to the question: PHP 7 won’t support nullable return-types just yet, but there’s an … Read more
Constructor is internally a nonstatic method with name <init> and void return type. It does not return anything. Internally first object is allocated and then its constructor is called. Object is not allocated with constructor itself. In other words the syntax new Object() not only calls the constructor but also creates new object and after … Read more