From 596ed37f55576eaedd3ecc42389caa652c8c5700 Mon Sep 17 00:00:00 2001
From: fmontoto <fmontotomonroy@gmail.com>
Date: Mon, 5 Sep 2016 23:10:27 -0300
Subject: [PATCH] fix swap and serialize

---
 include/sdsl/k2_tree.hpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/sdsl/k2_tree.hpp b/include/sdsl/k2_tree.hpp
index 4acfbfe6a..3d20cc9fa 100644
--- a/include/sdsl/k2_tree.hpp
+++ b/include/sdsl/k2_tree.hpp
@@ -330,6 +330,8 @@ class k2_tree
                 k_l = tr.k_l;
                 k_t_rank = tr.k_t_rank;
                 k_t_rank.set_vector(&k_t);
+                k_k = tr.k_k;
+                k_height = tr.k_height;
             }
             return *this;
         }
@@ -339,7 +341,10 @@ class k2_tree
         {
             if (this != &tr) {
                 std::swap(k_t, tr.k_t);
+				std::swap(k_l, tr.k_l);
                 util::swap_support(k_t_rank, tr.k_t_rank, &k_t, &(tr.k_t));
+				std::swap(k_k, tr.k_k);
+				std::swap(k_height, tr.k_height);
             }
         }
 
@@ -457,7 +462,7 @@ class k2_tree
          *  \returns The number of written bytes.
          */
         size_type serialize(std::ostream& out, structure_tree_node* v=nullptr,
-                            std::string name="")
+                            std::string name="") const
         {
             structure_tree_node* child = structure_tree::add_child(
                                              v, name, util::class_name(*this));