From afad6fbd6cb66231a42b66f558b9d80cf765ef68 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mael=20Rouxel-Labb=C3=A9?=
 <mael.rouxel.labbe@geometryfactory.com>
Date: Wed, 27 May 2020 22:25:10 +0200
Subject: [PATCH] Add missing references

---
 BGL/include/CGAL/boost/graph/IO/INP.h | 10 +++++-----
 BGL/include/CGAL/boost/graph/IO/PLY.h |  6 +++---
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/BGL/include/CGAL/boost/graph/IO/INP.h b/BGL/include/CGAL/boost/graph/IO/INP.h
index 5524b30e3f5..35ec887426c 100644
--- a/BGL/include/CGAL/boost/graph/IO/INP.h
+++ b/BGL/include/CGAL/boost/graph/IO/INP.h
@@ -22,8 +22,8 @@ namespace CGAL {
 
 template <typename FaceGraph, typename CGAL_BGL_NP_TEMPLATE_PARAMETERS>
 bool write_INP(std::ostream& os,
-               const std::string name,
-               const std::string type,
+               const std::string& name,
+               const std::string& type,
                const FaceGraph& g,
                const CGAL_BGL_NP_CLASS& np)
 {
@@ -71,7 +71,7 @@ bool write_INP(std::ostream& os,
 
 template <typename FaceGraph, typename CGAL_BGL_NP_TEMPLATE_PARAMETERS>
 bool write_INP(const char* fname,
-               const std::string type,
+               const std::string& type,
                const FaceGraph& g,
                const CGAL_BGL_NP_CLASS& np)
 {
@@ -80,13 +80,13 @@ bool write_INP(const char* fname,
 }
 
 template <typename FaceGraph>
-bool write_INP(std::ostream& os, const std::string name, const std::string type, const FaceGraph& g)
+bool write_INP(std::ostream& os, const std::string& name, const std::string& type, const FaceGraph& g)
 {
   return write_INP(os, name, type, g, parameters::all_default());
 }
 
 template <typename FaceGraph>
-bool write_INP(const char* fname, const std::string type, const FaceGraph& g)
+bool write_INP(const char* fname, const std::string& type, const FaceGraph& g)
 {
   return write_INP(fname, type, g, parameters::all_default());
 }
diff --git a/BGL/include/CGAL/boost/graph/IO/PLY.h b/BGL/include/CGAL/boost/graph/IO/PLY.h
index 3ac92ae4cb3..8024c0daa4e 100644
--- a/BGL/include/CGAL/boost/graph/IO/PLY.h
+++ b/BGL/include/CGAL/boost/graph/IO/PLY.h
@@ -214,7 +214,7 @@ bool read_PLY(const std::string& fname, FaceGraph& g)
 template <class FaceGraph, class NamedParameters>
 bool write_PLY(std::ostream& os,
                const FaceGraph& g,
-               const std::string comments,
+               const std::string& comments,
                const NamedParameters& np)
 {
   typedef typename boost::graph_traits<FaceGraph>::vertex_descriptor                          vertex_descriptor;
@@ -334,7 +334,7 @@ bool write_PLY(std::ostream& os,
 template <class FaceGraph>
 bool write_PLY(std::ostream& os,
                const FaceGraph& g,
-               const std::string comments)
+               const std::string& comments)
 {
   return write_PLY(os, g, comments, parameters::all_default());
 }
@@ -387,7 +387,7 @@ bool write_PLY(std::ostream& os,
 template <class FaceGraph, class NamedParameters>
 bool write_PLY(const char* fname,
                const FaceGraph& g,
-               const std::string comments,
+               const std::string& comments,
                const NamedParameters& np)
 {
   std::ofstream os(fname);