From cbf86357a54594e933ef289eb53ba8aeeee0d2e0 Mon Sep 17 00:00:00 2001
From: Seth Bromberger <sbromberger@users.noreply.github.com>
Date: Sun, 19 Aug 2018 12:52:14 -0700
Subject: [PATCH] fixes reverse (#994)

We will probably want to move this into SimpleGraphs at some point, but until then, I think this is good.
---
 src/SimpleGraphs/SimpleGraphs.jl | 4 ++--
 src/operators.jl                 | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/SimpleGraphs/SimpleGraphs.jl b/src/SimpleGraphs/SimpleGraphs.jl
index 5f757fc43..ad10e23ee 100644
--- a/src/SimpleGraphs/SimpleGraphs.jl
+++ b/src/SimpleGraphs/SimpleGraphs.jl
@@ -5,7 +5,7 @@ using LinearAlgebra
 using LightGraphs
 
 import Base:
-    eltype, show, ==, Pair, Tuple, copy, length, issubset, zero, in, iterate
+    eltype, show, ==, Pair, Tuple, copy, length, issubset, reverse, zero, in, iterate
 
 import LightGraphs:
     _NI, AbstractGraph, AbstractEdge, AbstractEdgeIter,
@@ -159,7 +159,7 @@ function rem_vertex!(g::AbstractSimpleGraph, v::Integer)
 end
 
 zero(g::T) where T<:AbstractSimpleGraph = T()
-
+    
 include("./simpleedge.jl")
 include("./simpledigraph.jl")
 include("./simplegraph.jl")
diff --git a/src/operators.jl b/src/operators.jl
index cca4c03cd..257bd79fd 100644
--- a/src/operators.jl
+++ b/src/operators.jl
@@ -41,7 +41,7 @@ original directed graph.
 Preserves the eltype of the input graph.
 """
 function reverse end
-@traitfn function reverse(g::::IsDirected)
+@traitfn function reverse(g::G::IsDirected) where G<:AbstractSimpleGraph
     gnv = nv(g)
     gne = ne(g)
     h = SimpleDiGraph(gnv)
@@ -57,7 +57,7 @@ end
 In-place reverse of a directed graph (modifies the original graph).
 """
 function reverse! end
-@traitfn function reverse!(g::::IsDirected)
+@traitfn function reverse!(g::G::IsDirected) where G<:AbstractSimpleGraph
     g.fadjlist, g.badjlist = g.badjlist, g.fadjlist
     return g
 end