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