Passing structs to functions

[Namespace via Digitalmars-d-learn]

On Saturday, 2 July 2016 at 19:40:53 UTC, phant0m wrote:
> On Saturday, 2 July 2016 at 19:25:37 UTC, ketmar wrote:
>> note the first "()", though: this is effectively a template 
>> function, which compiler will instantiate either with "ref" or 
>> without it.
>
> Yeah, I've noticed it. Always using function template for this 
> use case seems like a weird idea.

Try this little trick:

----
import std.stdio;

struct A {
	private A* _this = null;
	public int id = 0;
	
	this(int id) {
		this.id = id;
	}
	
	ref A byRef() {
		_this = &this;
		
		return *_this;
	}
}

void foo(ref const A a) {
	writeln(a.id);
}

void main() {
	foo(A(42).byRef());
}
----