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instance method

TSort#each_strongly_connected_component_from

each_strongly_connected_component_from(node, id_map={}, stack=[]) { |nodes| ... }

# File tmp/rubies/ruby-3.0.5/lib/tsort.rb, line 383
def each_strongly_connected_component_from(node, id_map={}, stack=[], &block) # :yields: nodes
  TSort.each_strongly_connected_component_from(node, method(:tsort_each_child), id_map, stack, &block)
end

Iterates over strongly connected component in the subgraph reachable from node.

Return value is unspecified.

each_strongly_connected_component_from doesn’t call tsort_each_node.

Example

class G
  include TSort
  def initialize(g)
    @g = g
  end
  def tsort_each_child(n, &b) @g[n].each(&b) end
  def tsort_each_node(&b) @g.each_key(&b) end
end

graph = G.new({1=>[2, 3], 2=>[4], 3=>[2, 4], 4=>[]})
graph.each_strongly_connected_component_from(2) {|scc| p scc }
#=> [4]
#   [2]

graph = G.new({1=>[2], 2=>[3, 4], 3=>[2], 4=>[]})
graph.each_strongly_connected_component_from(2) {|scc| p scc }
#=> [4]
#   [2, 3]

See also .each_strongly_connected_component_from #each_strongly_connected_component #strongly_connected_components .tsort_each also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1

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