Merge pull request #384 from jpetso/jpetso_refwrap

Support to-object conversions for std::reference_wrapper<const T>.

Author: redboltz

include/msgpack/adaptor/cpp11/reference_wrapper.hpp

@@ -24,6 +24,7 @@
 #include "msgpack/adaptor/check_container_size.hpp"
 
 #include <memory>
+#include <type_traits>
 
 namespace msgpack {
 
@@ -53,14 +54,14 @@ struct pack<std::reference_wrapper<T>> {
 template <typename T>
 struct object<std::reference_wrapper<T> > {
     void operator()(msgpack::object& o, const std::reference_wrapper<T>& v) const {
-        msgpack::adaptor::object<T>()(o, v.get());
+        msgpack::adaptor::object<typename std::remove_const<T>::type>()(o, v.get());
     }
 };
 
 template <typename T>
 struct object_with_zone<std::reference_wrapper<T>> {
     void operator()(msgpack::object::with_zone& o, const std::reference_wrapper<T>& v) const {
-        msgpack::adaptor::object_with_zone<T>()(o, v.get());
+        msgpack::adaptor::object_with_zone<typename std::remove_const<T>::type>()(o, v.get());
     }
 };
 

test/reference_wrapper_cpp11.cpp

@@ -17,7 +17,20 @@ TEST(MSGPACK_REFERENCE_WRAPPER, pack_convert)
     msgpack::object_handle oh = msgpack::unpack(ss.str().data(), ss.str().size());
     int i2 = 0;
     std::reference_wrapper<int> val2(i2);
-    oh.get().convert(val2);;
+    oh.get().convert(val2);
+    EXPECT_EQ(i1, i2);
+}
+
+TEST(MSGPACK_REFERENCE_WRAPPER, pack_convert_const)
+{
+    const int i1 = 42;
+    std::reference_wrapper<const int> val1(i1);
+    std::stringstream ss;
+    msgpack::pack(ss, val1);
+    msgpack::object_handle oh = msgpack::unpack(ss.str().data(), ss.str().size());
+    int i2 = 0;
+    std::reference_wrapper<int> val2(i2);
+    oh.get().convert(val2);
     EXPECT_EQ(i1, i2);
 }
 
@@ -44,6 +57,17 @@ TEST(MSGPACK_REFERENCE_WRAPPER, object)
     EXPECT_EQ(i1, i2);
 }
 
+TEST(MSGPACK_REFERENCE_WRAPPER, object_const)
+{
+    const int i1 = 42;
+    std::reference_wrapper<const int> val1(i1);
+    msgpack::object o(val1);
+    int i2 = 0;
+    std::reference_wrapper<int> val2(i2);
+    o.convert(val2);
+    EXPECT_EQ(i1, i2);
+}
+
 TEST(MSGPACK_REFERENCE_WRAPPER, object_with_zone)
 {
     std::string s1 = "ABC";
@@ -56,4 +80,16 @@ TEST(MSGPACK_REFERENCE_WRAPPER, object_with_zone)
     EXPECT_EQ(s1, s2);
 }
 
+TEST(MSGPACK_REFERENCE_WRAPPER, object_with_zone_const)
+{
+    const std::string s1 = "ABC";
+    std::reference_wrapper<const std::string> val1(s1);
+    msgpack::zone z;
+    msgpack::object o(val1, z);
+    std::string s2 = "DE";
+    std::reference_wrapper<std::string> val2(s2);
+    o.convert(val2);
+    EXPECT_EQ(s1, s2);
+}
+
 #endif // !defined(MSGPACK_USE_CPP03)