From 9ea82441c277439479333813e11757a2f74196e7 Mon Sep 17 00:00:00 2001
From: Simon Giraudot <simon.giraudot@geometryfactory.com>
Date: Wed, 5 Aug 2020 10:06:49 +0200
Subject: [PATCH] Use unique_ptr and add copy/move semantics

---
 .../include/CGAL/Small_unordered_set.h        | 43 ++++++++++++++++++-
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/STL_Extension/include/CGAL/Small_unordered_set.h b/STL_Extension/include/CGAL/Small_unordered_set.h
index b55d10c2ac6..86b2f524df4 100644
--- a/STL_Extension/include/CGAL/Small_unordered_set.h
+++ b/STL_Extension/include/CGAL/Small_unordered_set.h
@@ -50,11 +50,50 @@ class Small_unordered_set
   using Set   = std::unordered_set<Key>;
 
   Array m_array;
-  std::shared_ptr<Set> m_set;
+  std::unique_ptr<Set> m_set;
   std::size_t m_size = 0;
 
 public:
 
+  Small_unordered_set() { }
+
+  ~Small_unordered_set() { }
+
+  Small_unordered_set (const Small_unordered_set& other)
+    : m_size (other.m_size)
+  {
+    if (other.m_set)
+      m_set = std::make_unique<Set>(*other.m_set);
+    else
+      m_array = other.m_array;
+  }
+
+  Small_unordered_set (Small_unordered_set&& other)
+    : m_size (other.m_size)
+  {
+    if (other.m_set)
+      m_set = std::move(other.m_set);
+    else
+      m_array = std::move(other.m_array);
+  }
+
+  Small_unordered_set& operator= (const Small_unordered_set& other)
+  {
+    m_size = other.m_size;
+    if (other.m_set)
+      m_set = std::make_unique<Set>(*other.m_set);
+    else
+      m_array = other.m_array;
+  }
+
+  Small_unordered_set& operator= (Small_unordered_set&& other)
+  {
+    if (other.m_set)
+      m_set = std::move(other.m_set);
+    else
+      m_array = std::move(other.m_array);
+  }
+
   bool insert (const Key& key)
   {
     if (m_size != MaxSize)
@@ -68,7 +107,7 @@ public:
 
     if (!m_set)
     {
-      m_set = std::make_shared<Set>();
+      m_set = std::make_unique<Set>();
       m_set->reserve (MaxSize + 1);
       for (const Key& a : m_array)
         m_set->insert(a);