Ellipsis notation in C#?
Have a look at the params keyword
variadic-functions
EnumSet from array, shortest variant?
This is two lines, but slightly less complex: EnumSet<Options> temp = EnumSet.noneOf(Options.class); // make an empty enumset temp.addAll(Arrays.asList(options)); // add varargs to it I don’t consider this worse than any other kind of variable declaration for a class which doesn’t have the constructor you want: SomeClass variable = new SomeClass(); // make an empty object … Read more
How to write a Haskell function that takes a variadic function as an argument
The trick is to make a type class for which you will define an instance for functions, and an instance for the return type. The fact that it’s a Bool is not a problem at all. We’re trying to write a function which takes a variadic argument and returns a Bool, so we’ll define a … Read more
Java two varargs in one method
Only one vararg, sorry. But using asList() makes it almost as convenient: public void myMethod(List<Integer> args1, List<Integer> args2) { … } ———– import static java.util.Arrays.asList; myMethod(asList(1,2,3), asList(4,5,6));
Ambiguous overloaded java methods with generics and varargs
An intuitive way to test whether method1 is more specific than method2 is to see whether method1 can be implemented by invoking method2 with the same parameters method1(params1){ method2(params1); // if compiles, method1 is more specific than method2 } If there are varargs, we may need to expand a vararg so that 2 methods have … Read more
Java varargs method param list vs. array
Arrays have been around from the beginning of Java, while varargs are a fairly recent addition. Thus a lot of older code still happily uses arrays. Note also that calling a generic vararg method with an explicit array parameter may silently produce different behaviour than expected: public <T> void foo(T… params) { … } int[] … Read more
Variadic functions parameters pass-through
Variadic functions receive the arguments as a slice of the type. In this case your function receives a []interface{} named args. When you pass that argument to fmt.Sprintf, you are passing it as a single argument of type []interface{}. What you really want is to pass each value in args as a separate argument (the … Read more
varargs and the ‘…’ argument
From the docs on varargs: The three periods after the final parameter’s type indicate that the final argument may be passed as an array or as a sequence of arguments. So you can pass multiple arguments or an array. The following works just fine: class VarargTest { public static void main(String[] args) { Object[] params … Read more
How to handle java variable length arguments in clojure?
Since Java varargs are actually arrays, you can call vararg functions in Clojure by passing an array. You could convert a Clojure seq (maybe by using Clojure’s variety of variable argument functions) into an array: (TestClass/aStaticFunction (into-array Integer [(int 1),(int 2)])) or (defn a-static-function-wrapper [& args] (TestClass/aStaticFunction (into-array Integer args)) Or make an array and … Read more
An example of use of varargs in C
Remember that arguments are passed on the stack. The va_start function contains the “magic” code to initialize the va_list with the correct stack pointer. It must be passed the last named argument in the function declaration or it will not work. What va_arg does is use this saved stack pointer, and extract the correct amount … Read more