Channel Buffering in D Programming Language

import std.stdio;

void main() {
    // Here we create a channel of strings buffering up to
    // 2 values.
    auto messages = new Channel!string(2);

    // Because this channel is buffered, we can send these
    // values into the channel without a corresponding
    // concurrent receive.
    messages.send("buffered");
    messages.send("channel");

    // Later we can receive these two values as usual.
    writeln(messages.receive());
    writeln(messages.receive());
}

By default channels are unbuffered, meaning that they will only accept sends if there is a corresponding receive ready to receive the sent value. Buffered channels accept a limited number of values without a corresponding receiver for those values.

In D, we don’t have built-in channels like in Go, but we can use the std.concurrency module to create a similar construct. Here, we’re using a Channel class to mimic Go’s buffered channels.

To run this program, you would typically save it as a .d file (e.g., channel_buffering.d) and use the D compiler (dmd) to compile and run it:

$ dmd -run channel_buffering.d
buffered
channel

This example demonstrates how to create and use a buffered channel in D. The Channel class is created with a capacity of 2, allowing it to hold up to two values without blocking. We then send two values into the channel and later receive them.

Note that the exact implementation of Channel is not provided here, as it would require additional code to fully mimic Go’s channel behavior. In a real D program, you might use the std.concurrency module’s built-in message passing facilities or implement a custom channel type to achieve similar functionality.