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ring_perimeter

geometry_algorithm::length

Function ring_perimeter 

Source 
pub fn ring_perimeter<R>(
    r: &R,
) -> <CartesianPerimeter as LengthStrategy<R>>::Out
where
    R: Ring,
    CartesianPerimeter: LengthStrategy<R>,
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.