Re: Emulation macros and pattern matching on D

[Steven Schveighoffer via Digitalmars-d-learn]

On 6/5/15 9:01 AM, Dennis Ritchie wrote:

Macros and operation of pattern matching `=>` in Rust I can write
something like this:

macro_rules!foo {
     (x => $e:expr) => (println!("mode X: {}", $e));
     (y => $e:expr) => (println!("mode Y: {}", $e));
}

fn main() {
     foo!(y => 3); // mode Y: 3
     foo!(x => 2); // mode X: 2
}

How is it possible to simulate in D?

string foo(string mode, string value)
{
   return `writefln("mode ` ~ mode ~ `: %s", ` ~ value ~ `);`;
}

void main()
{
   mixin(foo("Y", "3"));
   mixin(foo("X", "2"));
}

-Steve