unitscale_macros

Overview

unitscale_macros provides procedural macros to simplify creating unit types and scale constants. This crate depends on unitscale_core and is intended to reduce boilerplate.

It exports two attribute macros:

• #[unit_scale(to = float)]: Declares a scale struct implementing UnitScale.
• #[unit_data]: Generates a generic struct for the unit and implements TryFrom<f64>, Scaled<U>, and new().

Example

use unitscale_core::*;
use unitscale_macros::*;

#[unit_scale(to = 0.1)]
struct Scale0_1;

#[unit_data]
struct Volts;

let v = Volts::<Scale0_1, u16>::try_from(3.2).unwrap();
// v.to_f64() gives back 3.2 within the precision limit of the type (e.g. u16)
assert_eq!(v.scaled_value(), 32);