Zig – OfdmFORUM

Maybe you’ve heard of it, maybe you haven’t. Zig is a new programming language that seems to be growing in popularity. Let’s do a quick dive into what it is, why it’s unique, and what sort of things you would use it for. (Ed Note: Other than “for great justice“, naturally.)

What Is It?

You’ve likely heard of Rust as it has made significant inroads in critical low-level infrastructures such as operating systems and embedded microcontrollers. As a gross oversimplification, it offers memory safety and many traditional runtime checks pushed to compile time. It has been the darling of many posts here at Hackaday as it offers some unique advantages. With Rust on the rise, it makes sense that there might be some space for some new players. Languages like Julia, Go, Swift, and even Racket are all relative newcomers vying for the highly coveted mindshare of software engineers everywhere.

So let’s talk Zig. In a broad sense, Zig is really trying to provide some of the safety of Rust with the simplicity and ease of C. It touts a few core features such as:

No hidden control flow
No hidden memory allocations
No preprocessor, no macros
First-class support for optional standard library
Interoperable by design
Adjustable Runtime Safety
Compile-time code-execution

The last one, in particular, is perhaps the most interesting, but we’ll come back to that. Let’s look at some code, but skipping past hello world and headed straight to opening a file. Here’s the C++ code:

#include <iostream>
#include <fstream>
#include <string>

using namespace std;
int main (int argc, char const *argv[]) {
  ifstream file("nonexistingfile.txt");

  char buffer[1024];
  file.read(buffer, sizeof(buffer));

  cout << buffer << endl;

  file.close();
  return 0;
}

Now let’s look at some comparable Zig code:

const std = @import("std");

using namespace std.fs;

pub fn main() !void {
    const stdout = std.io.getStdOut().writer();

    const file = try cwd().openFile(
        "nonexistingfile.txt",
        .{ .read = true },
    );
    defer file.close();

    var buffer: [1024]u8 = undefined;
    const size = try file.readAll(buffer[0..]);

    try stdout.writeAll(buffer[0..size]);
}

(Thanks to Erik Engheim for the C++ and Zig sample code.)

As you might have guessed from the file name, the file doesn’t exist. The C++ code doesn’t explicitly check for any errors and in this scenario, it is perfectly valid code that displays no indication that anything failed. Zig, on the other hand, we have to do a try since that file could fail. When it does fail, you get a nice stack trace:

error: FileNotFound
/usr/local/Cellar/zig/0.7.0/lib/zig/std/os.zig:1196:23: 0x10b3ba52e in std.os.openatZ (fileopen)
            ENOENT => return error.FileNotFound,
                      ^
/usr/local/Cellar/zig/0.7.0/lib/zig/std/fs.zig:754:13: 0x10b3b857e in std.fs.Dir.openFileZ (fileopen)
            try os.openatZ(self.fd, sub_path, os_flags, 0);
            ^
/usr/local/Cellar/zig/0.7.0/lib/zig/std/fs.zig:687:9: 0x10b3b6c4b in std.fs.Dir.openFile (fileopen)
        return self.openFileZ(&path_c, flags);
        ^
~/Development/Zig/fileopen.zig:8:18: 0x10b3b6810 in main (fileopen)
    const file = try cwd().openFile(

Removing the try results in a compilation error. The backtrace here is especially impressive because this is a relatively simple language without a garbage collector, runtime, or virtual machine.

Let’s talk about some of Zig’s other

Tag: Zig

Need A New Programming Language? Try Zig

What Is It?