Implicit Constructors

[Steven Schveighoffer]

On 10/13/17 2:33 AM, Jacob Carlborg wrote:
> Hmm, I didn't know that syntax was legal. But apparently it's some form 
> of typesafe variadic function [1]. It also work for built-in types:
> 
> void foo(int i ...){}
> 
> void main()
> {
>      foo(3);
>      foo(3, 4); // error, too many arguments
> }
> 
> Not sure what the purpose of the latter is.
> 
> [1] https://dlang.org/spec/function.html#typesafe_variadic_functions
> 

I believe it probably calls the builtin constructor:

auto i = int(3);

auto i = int(3, 4); // error

Indeed it seems useless to have such a thing, as most builtin ctors 
would be equivalent to passing a convertible value anyway.

-Steve