Function envelope 

pub fn envelope<G>(
    g: &G,
) -> <<G::Kind as EnvelopeStrategyForKind>::S as EnvelopeStrategy<G>>::Output
where
    G: Geometry,
    G::Kind: EnvelopeStrategyForKind,
    <G::Kind as EnvelopeStrategyForKind>::S: EnvelopeStrategy<G>,

Axis-aligned bounding box of g.

Mirrors boost::geometry::envelope(g, mbr) from boost/geometry/algorithms/envelope.hpp — the C++ side mutates mbr in place; the Rust side returns a fresh geometry_model::Box<G::Point>.

Supported geometry kinds: Point, Linestring, Ring, Polygon, Segment, Box, MultiPoint, MultiLinestring, MultiPolygon — each selected by the tag-keyed [geometry_strategy::EnvelopeStrategyForKind] picker, so any concept-adapted foreign type resolves through the same per-kind impl in geometry_strategy::envelope as the equivalent model value.