Required Reading: "How Non-Member Functions Improve Encapsulation"

[codephantom]

On Thursday, 26 October 2017 at 23:29:24 UTC, Walter Bright wrote:
> You can also do things like:
>
> --- s.d -------
> struct S { int x; ref int X() { return x; } }
>
> --- splus.d ----
> public import s;
> int increment(S s) { s.X() += 1; } // note no access to S.x
>
> --- user.d ----
> import splus;
> void foo(ref S s) { s.increment(); }

I'd like to do this too:
-------------------------
import std.stdio;

void main()
{
     //int foo;
     if (int foo.bar != 0)  // no, sorry, you cannot declare foo 
here.
     {
         throw new Exception("foo.bar != 0");
     }
}

auto bar(int x,)
{
     return -10;
}

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