Default initialization of structs?

[Lodovico Giaretta via Digitalmars-d-learn]

On Friday, 17 June 2016 at 10:50:55 UTC, Gary Willoughby wrote:
> I have a struct where I need to perform default initialization 
> of some members but the compiler doesn't allow to define a 
> default constructor which allow optional arguments.
>
> struct Foo(T)
> {
>     private int _bar;
>
>     this(int bar = 1)
>     {
>         this._bar = bar;
>     }
> }
>
> auto foo = Foo!(string) // error
>
> Are there any patterns or idioms I could use to get the desired 
> result? Or is it just the case if I use a constructor I have to 
> pass values to it?

struct Foo(T)
{
     private int _bar = 1;

     this(int bar)
     {
         this._bar = bar;
     }
}

auto foo = Foo!(string)();

This should do the trick.