Improve graphlib::iterators::Dijkstra API #57
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We only consume `self` for `iterator: VecDequeue`, which is unused outside of this routine and might as well be a local variable.
While here, drop an unnecessary bare `Option::unwrap()`.
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The
Dijkstra::new()API computes the single-source shortest path between a given source and every other vertex in the graph. For a consumer that cares about the shortest path between a given source and two or more other graph nodes (e.g.,A→B,A→C, etc), the SSSP computation can be reused. This is more efficient than recomputing it for every destination node (and part of why SSSP is a great algorithm).These changes make reuse more ergonomic by not consuming the value, and referencing the
Dijkstraobject immutably rather than mutably.Previously, one could reuse the results of the SSSP computation only by
clone()ing the entireDijkstraobject, which is inefficient.Tests continue to pass.