mirror of
https://codeberg.org/andyscott/ziglings.git
synced 2024-12-22 22:13:11 -05:00
54 lines
1.4 KiB
Zig
54 lines
1.4 KiB
Zig
//
|
|
// The power and purpose of async/await becomes more apparent
|
|
// when we do multiple things concurrently. Foo and Bar do not
|
|
// depend on each other and can happen at the same time, but End
|
|
// requires that they both be finished.
|
|
//
|
|
// +---------+
|
|
// | Start |
|
|
// +---------+
|
|
// / \
|
|
// / \
|
|
// +---------+ +---------+
|
|
// | Foo | | Bar |
|
|
// +---------+ +---------+
|
|
// \ /
|
|
// \ /
|
|
// +---------+
|
|
// | End |
|
|
// +---------+
|
|
//
|
|
// We can express this in Zig like so:
|
|
//
|
|
// fn foo() u32 { ... }
|
|
// fn bar() u32 { ... }
|
|
//
|
|
// // Start
|
|
//
|
|
// var foo_frame = async foo();
|
|
// var bar_frame = async bar();
|
|
//
|
|
// var foo_value = await foo_frame;
|
|
// var bar_value = await bar_frame;
|
|
//
|
|
// // End
|
|
//
|
|
// Please await TWO page titles!
|
|
//
|
|
const print = @import("std").debug.print;
|
|
|
|
pub fn main() void {
|
|
var com_frame = async getPageTitle("http://example.com");
|
|
var org_frame = async getPageTitle("http://example.org");
|
|
|
|
var com_title = com_frame;
|
|
var org_title = org_frame;
|
|
|
|
print(".com: {s}, .org: {s}.\n", .{ com_title, org_title });
|
|
}
|
|
|
|
fn getPageTitle(url: []const u8) []const u8 {
|
|
// Please PRETEND this is actually making a network request.
|
|
_ = url;
|
|
return "Example Title";
|
|
}
|