variadic-functions

This question already has an answer here: Ambiguous varargs methods 4 answers I do not understand why here in case 1, it is not giving compilation error, contrary in case 2 (varargs), it gives compilation error. Can anyone please elaborate what differences the compiler makes in these two cases? I went through many posts about it, but not able to understand it yet. Case #1 public class Test { public void display(int a) { System.out.println("1"); } public void display(Integer a) { System.out.println("2"); } public static void main(String[] args) { new Test().display(0); } } The Output is: 1 Case

This question already has an answer here: Requiring at least one element in java variable argument list 7 answers I want to force the user to fill in an optional parameter when calling my constructor: public MyClass(String... params) { this.params = params; } Currently, the following code is valid: new MyClass(); I want to prevent it. I thought of this: public MyClass(String param1, String... otherParams) { this.params = new String[1 + otherParams.length]; this.params[0] = param1; // fill 1..N params from otherParams } String[] params is not an option, because I need the ability to use comma

I have two variadic function as foo(format, ...) and bar(format, ...) . I want to implement function foo so that it can invoke bar with the same list of arguments it has. That is, foo(format...) { ... bar(format, ...); } For instance, invoking foo("(ii)", 1, 2) will invoke bar with same arguments bar("(ii)", 1, 2) . How should this foo function be implemented? PS: function bar is from a legacy library which I cant change its interface. Can't be done, as long as all you have is a bunch if functions with ... arguments. You have to plan ahead for things like that and implement each variadic

How can I create a function with a variable number of arguments in Rust? Like this Java code: void foo(String... args) { for (String arg : args) { System.out.println(arg); } } In general, you can't - Rust does not support variadic functions, except when interoperating with C code that uses varargs. In this case, since all of your arguments are the same type, you can accept a slice: fn foo(args: &[&str]) { for arg in args { println!("{}", arg); } } fn main() { foo(&["hello", "world", "I", "am", "arguments"]); } ( Playground ) Beyond that, you can explicitly accept optional arguments: fn foo

This question already has an answer here: cannot make a static reference to a non static method 5 answers Why won't this compile? public class PrimitiveVarArgs { public static void main(String[] args) { int[] ints = new int[]{1, 2, 3, 4, 5}; prints(ints); } void prints(int... ints) { for(int i : ints) System.out.println(i); } } It complains about line 5, saying: method prints in class PrimitiveVarArgs cannot be applied to given types; required: int[] found: int[] reason: varargs mismatch; int[] cannot be converted to int but as far as I ( and others on SO ) know, int... is the same as int[] .

I am using a va_list to construct a string that is rendered. void Text2D::SetText(const char *szText, ...) This is all fine and good, but now the user has the ability to change the language while the application is running. I need to regenerate all the text strings and re-cache the text bitmaps after initialization. I would like to store the va_list and use it whenever the text needs to be generated. To give you some more background, this needs to happen in the case where the key string that I'm translating has a dynamic piece of data in it. "Player Score:%d" That is the key string I need to

I was looking for solutions for calling Javascript constructors with an arbitrary number of arguments, and found some good SO posts, which led me to believe that these three calls should work the same. However, at least in rhino and node.js, they do not: 1. f = Date.bind(Date, 2000,0,1) 2. g = Date.bind.call(Date, 2000, 0, 1) 3. h = Date.bind.apply(Date, [2000, 0, 1]) The first one has the desired result: print(new f()) //=> Sat Jan 01 2000 00:00:00 GMT-0500 (EST) But the other two don't: print(new g()) //=> Thu Feb 01 1900 00:00:00 GMT-0500 (EST) print(new h()) //=> Wed Jun 01 1904 00:00:00