From cf42e4c1a445e7635a85f5aa812a5c3edd1fbc52 Mon Sep 17 00:00:00 2001
From: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
Date: Tue, 16 Jun 2015 19:28:24 +0200
Subject: [PATCH] core: Fix enable_lw_shared_from_this<T>::shared_from_this()
 const

Compilation failed when shared_from_this() was called on a const object.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
---
 core/shared_ptr.hh       |  2 +-
 tests/shared_ptr_test.cc | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/core/shared_ptr.hh b/core/shared_ptr.hh
index b474325b90..9e47c1c0d4 100644
--- a/core/shared_ptr.hh
+++ b/core/shared_ptr.hh
@@ -291,7 +291,7 @@ template <typename T>
 inline
 lw_shared_ptr<const T>
 enable_lw_shared_from_this<T>::shared_from_this() const {
-    return lw_shared_ptr<const T>(this);
+    return lw_shared_ptr<const T>(const_cast<enable_lw_shared_from_this*>(this));
 }
 
 template <typename T>
diff --git a/tests/shared_ptr_test.cc b/tests/shared_ptr_test.cc
index 6b3dc3316a..21e8a814bf 100644
--- a/tests/shared_ptr_test.cc
+++ b/tests/shared_ptr_test.cc
@@ -82,3 +82,14 @@ BOOST_AUTO_TEST_CASE(test_lw_const_ptr_2) {
     lw_shared_ptr<const E> pe3 = pe2;
     BOOST_REQUIRE(pe2 == pe3);
 }
+
+struct F : enable_lw_shared_from_this<F> {
+    auto const_method() const {
+        return shared_from_this();
+    }
+};
+
+BOOST_AUTO_TEST_CASE(test_shared_from_this_called_on_const_object) {
+    auto ptr = make_lw_shared<F>();
+    ptr->const_method();
+}