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within

geometry_algorithm::within

Function within 

Source 
pub fn within<P, G>(p: &P, g: &G) -> bool
where
    P: Point,
    G: Geometry,
    G::Kind: WithinStrategyForKind,
    <G::Kind as WithinStrategyForKind>::S: WithinStrategy<P, G>,
Expand description

true iff p lies in the strict interior of g.

Mirrors boost::geometry::within(p, g) from boost/geometry/algorithms/within.hpp. The default strategy is selected per geometry kind by the tag-keyed [geometry_strategy::WithinStrategyForKind] picker (see geometry_strategy::within), mirroring Boost’s services::default_strategy resolution at strategies/cartesian/point_in_poly_winding.hpp:254-258.

Boundary semantics follow Boost: a point on a segment, vertex, or box face returns false from within and true from covered_by. See test/strategies/winding.cpp:34-43 for the reference cases (all corners and sides “officially false”).