diff --git a/src/libraries/turtle/constraints.hpp b/src/libraries/turtle/constraints.hpp
index 4369e92..829d6c8 100644
--- a/src/libraries/turtle/constraints.hpp
+++ b/src/libraries/turtle/constraints.hpp
@@ -11,6 +11,7 @@
 
 #include "constraint.hpp"
 #include "log.hpp"
+#include <boost/ref.hpp>
 #include <boost/utility/enable_if.hpp>
 #include <boost/type_traits/is_convertible.hpp>
 #include <boost/preprocessor/stringize.hpp>
@@ -75,11 +76,11 @@ namespace mock
         return detail::N< T >( t ); \
     }
 
-    MOCK_CONSTRAINT(equal, actual == expected_)
-    MOCK_CONSTRAINT(less, actual < expected_)
-    MOCK_CONSTRAINT(greater, actual > expected_)
-    MOCK_CONSTRAINT(less_equal, actual <= expected_)
-    MOCK_CONSTRAINT(greater_equal, actual >= expected_)
+    MOCK_CONSTRAINT(equal, actual == boost::unwrap_ref( expected_ ))
+    MOCK_CONSTRAINT(less, actual < boost::unwrap_ref( expected_ ))
+    MOCK_CONSTRAINT(greater, actual > boost::unwrap_ref( expected_ ))
+    MOCK_CONSTRAINT(less_equal, actual <= boost::unwrap_ref( expected_ ))
+    MOCK_CONSTRAINT(greater_equal, actual >= boost::unwrap_ref( expected_ ))
 
 #undef MOCK_CONSTRAINT
 
@@ -115,7 +116,7 @@ namespace detail
                 boost::is_convertible< Expected*, Actual >
             >::type* = 0 ) const
         {
-            actual = expected_;
+            actual = boost::unwrap_ref( expected_ );
             return true;
         }
         template< typename Actual >
@@ -124,7 +125,7 @@ namespace detail
                 boost::is_convertible< Expected, Actual >
             >::type* = 0 ) const
         {
-            *actual = expected_;
+            *actual = boost::unwrap_ref( expected_ );
             return true;
         }
         friend std::ostream& operator<<( std::ostream& s, const assign& a )
@@ -173,7 +174,7 @@ namespace detail
         {}
         bool operator()( const std::string& actual ) const
         {
-            return actual.find( expected_ ) != std::string::npos;
+            return actual.find( boost::unwrap_ref( expected_ ) ) != std::string::npos;
         }
         friend std::ostream& operator<<( std::ostream& s, const contain& n )
         {
diff --git a/src/libraries/turtle/log.hpp b/src/libraries/turtle/log.hpp
index 9def4bd..f521f8f 100644
--- a/src/libraries/turtle/log.hpp
+++ b/src/libraries/turtle/log.hpp
@@ -21,6 +21,7 @@ namespace assign_detail
 {
     template< typename T > class generic_list;
 }
+    template< typename T > class reference_wrapper;
 }
 
 namespace mock
@@ -241,6 +242,12 @@ namespace detail
         mock::detail::serialize( s, t.begin(), t.end() );
         return s;
     }
+    template< typename T >
+    stream& operator<<( stream& s,
+        const boost::reference_wrapper< T >& t )
+    {
+        return s << mock::format( t.get() );
+    }
 
     template< typename T >
     BOOST_DEDUCED_TYPENAME boost::enable_if<
diff --git a/src/tests/turtle_test/constraints_test.cpp b/src/tests/turtle_test/constraints_test.cpp
index 6ef92a1..4c7460d 100644
--- a/src/tests/turtle_test/constraints_test.cpp
+++ b/src/tests/turtle_test/constraints_test.cpp
@@ -44,6 +44,22 @@ BOOST_AUTO_TEST_CASE( constraints_can_be_combined_using_the_and_operator )
     mock::less( 0 ) && mock::greater( 0 );
 }
 
+BOOST_AUTO_TEST_CASE( equal )
+{
+    BOOST_CHECK( mock::equal( std::string( "string" ) ).f_( "string" ) );
+    BOOST_CHECK( ! mock::equal( std::string( "string" ) ).f_( "not string" ) );
+    {
+        std::string s;
+        mock::constraint<
+            mock::detail::equal<
+                boost::reference_wrapper< const std::string >
+            >
+        > c = mock::equal( boost::cref( s ) );
+        s = "string";
+        BOOST_CHECK( c.f_( "string" ) );
+    }
+}
+
 BOOST_AUTO_TEST_CASE( same )
 {
     int i = 0;
@@ -71,6 +87,30 @@ BOOST_AUTO_TEST_CASE( assign )
         BOOST_CHECK( mock::assign( &j ).f_( i ) );
         BOOST_CHECK_EQUAL( i, &j );
     }
+    {
+        int i = 0;
+        int j = 0;
+        mock::constraint<
+            mock::detail::assign<
+                boost::reference_wrapper< const int >
+            >
+        > c = mock::assign( boost::cref( j ) );
+        j = 3;
+        BOOST_CHECK( c.f_( i ) );
+        BOOST_CHECK_EQUAL( 3, i );
+    }
+    {
+        int i = 0;
+        int j = 0;
+        mock::constraint<
+            mock::detail::assign<
+                boost::reference_wrapper< const int >
+            >
+        > c = mock::assign( boost::cref( j ) );
+        j = 3;
+        BOOST_CHECK( c.f_( &i ) );
+        BOOST_CHECK_EQUAL( 3, i );
+    }
 }
 
 BOOST_AUTO_TEST_CASE( retrieve )
@@ -184,6 +224,20 @@ BOOST_AUTO_TEST_CASE( contain_with_const_char_ptr )
     BOOST_CHECK( mock::contain( "string" ).f_( std::string( "this is a string" ) ) );
     BOOST_CHECK( ! mock::contain( "not found" ).f_( "this is a string" ) );
     BOOST_CHECK( ! mock::contain( "not found" ).f_( std::string( "this is a string" ) ) );
+    {
+        char* s;
+        mock::constraint<
+            mock::detail::contain<
+                boost::reference_wrapper< char* const >
+            >
+        > c = mock::contain( boost::cref( s ) );
+        s = "string";
+        BOOST_CHECK( c.f_( "this is a string" ) );
+        BOOST_CHECK( c.f_( std::string( "this is a string" ) ) );
+        s = "not found";
+        BOOST_CHECK( ! c.f_( "this is a string" ) );
+        BOOST_CHECK( ! c.f_( std::string( "this is a string" ) ) );
+    }
 }
 
 BOOST_AUTO_TEST_CASE( contain_with_strings )
@@ -192,4 +246,18 @@ BOOST_AUTO_TEST_CASE( contain_with_strings )
     BOOST_CHECK( mock::contain( std::string( "string" ) ).f_( std::string( "this is a string" ) ) );
     BOOST_CHECK( ! mock::contain( std::string( "not found" ) ).f_( "this is a string" ) );
     BOOST_CHECK( ! mock::contain( std::string( "not found" ) ).f_( std::string( "this is a string" ) ) );
+    {
+        std::string s;
+        mock::constraint<
+            mock::detail::contain<
+                boost::reference_wrapper< const std::string >
+            >
+        > c = mock::contain( boost::cref( s ) );
+        s = "string";
+        BOOST_CHECK( c.f_( "this is a string" ) );
+        BOOST_CHECK( c.f_( std::string( "this is a string" ) ) );
+        s = "not found";
+        BOOST_CHECK( ! c.f_( "this is a string" ) );
+        BOOST_CHECK( ! c.f_( std::string( "this is a string" ) ) );
+    }
 }
diff --git a/src/tests/turtle_test/log_with_conversions_test.cpp b/src/tests/turtle_test/log_with_conversions_test.cpp
index 6262433..e462130 100644
--- a/src/tests/turtle_test/log_with_conversions_test.cpp
+++ b/src/tests/turtle_test/log_with_conversions_test.cpp
@@ -410,6 +410,12 @@ BOOST_AUTO_TEST_CASE( boost_assign_map_list_of_are_serialized_with_conversions )
     BOOST_CHECK_EQUAL( "((12,\"12\"),(42,\"42\"))", to_string( boost::assign::map_list_of( 12, "12" )( 42, "42" ) ) );
 }
 
+BOOST_AUTO_TEST_CASE( boost_reference_wrappers_are_serialized_with_conversions )
+{
+    BOOST_CHECK_EQUAL( "3", to_string( boost::cref( 3 ) ) );
+    BOOST_CHECK_EQUAL( "\"string\"", to_string( boost::cref( "string" ) ) );
+}
+
 namespace
 {
     void callable_builtin()
diff --git a/src/tests/turtle_test/log_without_conversions_test.cpp b/src/tests/turtle_test/log_without_conversions_test.cpp
index 84f75e8..b0cdbe5 100644
--- a/src/tests/turtle_test/log_without_conversions_test.cpp
+++ b/src/tests/turtle_test/log_without_conversions_test.cpp
@@ -406,6 +406,12 @@ BOOST_AUTO_TEST_CASE( boost_assign_map_list_of_are_serialized_without_conversion
     BOOST_CHECK_EQUAL( "((12,\"12\"),(42,\"42\"))", to_string( boost::assign::map_list_of( 12, "12" )( 42, "42" ) ) );
 }
 
+BOOST_AUTO_TEST_CASE( boost_reference_wrappers_are_serialized_without_conversions )
+{
+    BOOST_CHECK_EQUAL( "3", to_string( boost::cref( 3 ) ) );
+    BOOST_CHECK_EQUAL( "\"string\"", to_string( boost::cref( "string" ) ) );
+}
+
 namespace
 {
     void callable_builtin()