What does "-|" mean in zig?

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1

I’m reading the GhostTTY devlogs and the author shows this bit of code:

const padding_x: f32 = (config.@"window-padding-x"* x_dpi) / 72;
const screen_width: u32 = self.width -| @as(u32, @intFromFloat(padding_x * 2));

What does -| mean here?

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2

It’s called “Saturating Subtraction”. It means if you have a unsigned integer type that cannot go below zero, and you subtract a different integer that would cause the difference to be less than zero, it will just return zero instead. You can read more about it here: Documentation - The Zig Programming Language

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Thank you very much, makes sense!

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4

I did not know zig had all of these kinds of operators, very cool.

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