Enum UnitScale 

pub enum UnitScale {
    Static(PositiveFiniteScale),
    Dynamic {
        scale_expr: Expr,
        base_unit_scale: PositiveFiniteScale,
    },
}

How a unit’s scale factor is determined.

Variants

Static(PositiveFiniteScale)

Scale factor known at compile time (e.g., const unit km: Length = 1000 m;).

Dynamic

Scale factor depends on runtime values (e.g., unit EUR: Money = (@rate) USD;).

The final SI scale = eval(scale_expr) * base_unit_scale.

Fields

scale_expr: Expr

The unevaluated scale expression containing @-references.

base_unit_scale: PositiveFiniteScale

The scale factor of the base unit in the definition (resolved at compile time). For (@rate) USD where USD has scale 1.0, this is 1.0.

Implementations

impl UnitScale

pub const fn as_static(&self) -> Option<f64>

Returns the static scale factor, or None if the scale is dynamic.

pub const fn is_static(&self) -> bool

Returns true if the scale is resolved at compile time.

pub const fn is_dynamic(&self) -> bool

Returns true if the scale depends on runtime values.

Trait Implementations

impl Clone for UnitScale

fn clone(&self) -> UnitScale

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UnitScale

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.