qtty_core/
macros.rs

1//! Macros for defining units and conversions.
2
3/// Generates `From` trait implementations for all pairs of units within a dimension.
4#[macro_export]
5macro_rules! impl_unit_conversions {
6    // Base case: single unit, no conversions needed
7    ($unit:ty) => {};
8
9    // Recursive case: implement conversions from first to all others, then recurse
10    ($first:ty, $($rest:ty),+ $(,)?) => {
11        $(
12            impl From<$crate::Quantity<$first>> for $crate::Quantity<$rest> {
13                fn from(value: $crate::Quantity<$first>) -> Self {
14                    value.to::<$rest>()
15                }
16            }
17
18            impl From<$crate::Quantity<$rest>> for $crate::Quantity<$first> {
19                fn from(value: $crate::Quantity<$rest>) -> Self {
20                    value.to::<$first>()
21                }
22            }
23        )+
24
25        // Recurse with the rest of the units
26        $crate::impl_unit_conversions!($($rest),+);
27    };
28}
qtty_core/macros.rs

qtty_core/
macros.rs
