Re: how to achieve C's Token Pasting (##) Operator to generate variable name in D?

[Ali Çehreli via Digitalmars-d-learn]

On 5/31/20 2:26 AM, Ali Çehreli wrote:

Unfortunately, I could not reach the following cleaner syntax with a 
mixin template:

   mixin RW!int.x;

Ok, I solved that too with a very convoluted "eponymous mixin template 
opDispatch." :)

struct RW(T) {
  template opDispatch(string name) {
    static codeImpl() {
      import std.format;

      return format!q{
        private %s _%s;
        public auto %s() { return _%s; }
        public auto %s(%s val) { _%s = val; return this; }
      }(T.stringof, name,
        name, name,
        name, T.stringof, name);
    }

    mixin template opDispatch(alias code = codeImpl()) {
      mixin (code);
    }
  }
}

struct Point {
  mixin RW!int.x;    // <-- NICE :)
  mixin RW!int.y;
    // etc.
}

import std.traits;
import std.stdio;

void main() {
  pragma(msg, FieldNameTuple!(Point));

  auto p = Point(1, 2);
  p.x = 42;
  p.y = 43;
  writeln(p);
}

Ali