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ring_perimeter

geometry_algorithm::length

Function ring_perimeter 

Source 
pub fn ring_perimeter<R>(
    r: &R,
) -> <DefaultPerimeterStrategy<R> as LengthStrategy<R>>::Out
where
    R: Ring,
    <<<R as Geometry>::Point as Point>::Cs as CoordinateSystem>::Family: DefaultPerimeter<<<<R as Geometry>::Point as Point>::Cs as CoordinateSystem>::Family>,
    DefaultPerimeterStrategy<R>: LengthStrategy<R> + Default,
Expand description

Standalone helper to compute the perimeter of a Ring directly, without wrapping it in a polygon. Mirrors Boost’s perimeter(ring) overload which dispatches via the ring_tag arm of algorithms/perimeter.hpp:66-73.