fixes DiGraph(DiGraph(...)) (#690)

Thanks, @juliohm!
sbromberger · Jul 18, 2017 · 38b4430 · 38b4430
1 parent da0c350
commit 38b4430
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diff --git a/src/graphtypes/simplegraphs/simpledigraph.jl b/src/graphtypes/simplegraphs/simpledigraph.jl
@@ -76,6 +76,7 @@ function (::Type{SimpleDiGraph{T}})(g::SimpleDiGraph) where T<:Integer
     return SimpleDiGraph(ne(g), h_fadj, h_badj)
 end
 
+SimpleDiGraph(g::SimpleDiGraph) = copy(g)
 
 # constructor from abstract graph: DiGraph(graph)
 function SimpleDiGraph(g::AbstractSimpleGraph)

diff --git a/test/graphtypes/simplegraphs/simplegraphs.jl b/test/graphtypes/simplegraphs/simplegraphs.jl
@@ -169,8 +169,11 @@ struct DummySimpleGraph <: AbstractSimpleGraph end
 
     gdx = CompleteDiGraph(4)
     for g in testdigraphs(gdx)
+        h = DiGraph(g)
+        @test g == h
         @test rem_vertex!(g, 2)
         @test nv(g) == 3 && ne(g) == 6
+        @test g != h
     end