use std::fmt::{Display, Formatter, Result}; use std::ops::{Add, Sub, AddAssign, SubAssign, Div, Mul, DivAssign, MulAssign}; use crate::metric::Unit; use crate::metric::Primitive; use crate::declare_unit_basics; use crate::declare_simple_unit; declare_simple_unit!(Force, Newton, "N");