Editing D (programming language) (section)

====Concurrency====
Concurrency is fully implemented in the library, and it does not require support from the compiler. Alternative implementations and methodologies of writing concurrent code are possible. The use of D typing system does help ensure memory safety.

<syntaxhighlight lang="D">
import std.stdio, std.concurrency, std.variant;

void foo() {
    bool cont = true;

    while (cont) {
        receive( // Delegates are used to match the message type.
            (int msg) => writeln("int received: ", msg),
            (Tid sender) { cont = false; sender.send(-1); },
            (Variant v) => writeln("huh?") // Variant matches any type
        );
    }
}

void main() {
    auto tid = spawn(&foo); // spawn a new thread running foo()

    foreach (i; 0 .. 10)
        tid.send(i);   // send some integers

    tid.send(1.0f);    // send a float
    tid.send("hello"); // send a string
    tid.send(thisTid); // send a struct (Tid)

    receive((int x) => writeln("Main thread received message: ", x));
}
</syntaxhighlight>