From 9c95545a548471aca956116d2fceda3bb5987fef Mon Sep 17 00:00:00 2001
From: Joey <joeytindall94@googlemail.com>
Date: Mon, 12 Feb 2024 15:26:26 -0500
Subject: [PATCH] Extend union to multiple named graphs

---
 src/abstractnamedgraph.jl | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/abstractnamedgraph.jl b/src/abstractnamedgraph.jl
index 319fbda..8a02734 100644
--- a/src/abstractnamedgraph.jl
+++ b/src/abstractnamedgraph.jl
@@ -381,6 +381,15 @@ function union(graph1::AbstractNamedGraph, graph2::AbstractNamedGraph)
   return union_graph
 end
 
+function union(
+  graph1::AbstractNamedGraph,
+  graph2::AbstractNamedGraph,
+  graph3::AbstractNamedGraph,
+  graph_rest::AbstractNamedGraph...,
+)
+  return union(union(graph1, graph2), graph3, graph_rest...)
+end
+
 function rem_vertex!(graph::AbstractNamedGraph, vertex)
   if vertex ∉ vertices(graph)
     return false