diff --git a/include/boost/intrusive_ptr.hpp b/include/boost/intrusive_ptr.hpp
index 4ada734..0a62544 100644
--- a/include/boost/intrusive_ptr.hpp
+++ b/include/boost/intrusive_ptr.hpp
@@ -193,6 +193,12 @@ template<class T> T * get_pointer(intrusive_ptr<T> const & p)
     return p.get();
 }
 
+namespace detail {
+  // is_pointerlike_helper enables Signals library to recognize intrusive_ptr
+  template<typename T>
+  type_traits::yes_type is_pointerlike_helper(const intrusive_ptr<T>&, int);
+} // end namespace detail
+
 } // namespace boost
 
 #ifdef BOOST_MSVC
diff --git a/include/boost/scoped_ptr.hpp b/include/boost/scoped_ptr.hpp
index 738ad1b..7adc0e8 100644
--- a/include/boost/scoped_ptr.hpp
+++ b/include/boost/scoped_ptr.hpp
@@ -119,6 +119,12 @@ template<typename T> inline T * get_pointer(scoped_ptr<T> const & p)
     return p.get();
 }
 
+namespace detail {
+  // is_pointerlike_helper enables Signals library to recognize scoped_ptr
+  template<typename T>
+  type_traits::yes_type is_pointerlike_helper(const scoped_ptr<T>&, int);
+} // end namespace detail
+
 } // namespace boost
 
 #endif // #ifndef BOOST_SCOPED_PTR_HPP_INCLUDED
diff --git a/include/boost/shared_ptr.hpp b/include/boost/shared_ptr.hpp
index 8f55948..d9cc25d 100644
--- a/include/boost/shared_ptr.hpp
+++ b/include/boost/shared_ptr.hpp
@@ -25,6 +25,7 @@
 #include <boost/checked_delete.hpp>
 #include <boost/throw_exception.hpp>
 #include <boost/detail/shared_count.hpp>
+#include <boost/type_traits/ice.hpp>
 
 #include <memory>             // for std::auto_ptr
 #include <algorithm>          // for std::swap
@@ -323,6 +324,12 @@ template<typename T> inline T * get_pointer(shared_ptr<T> const & p)
     return p.get();
 }
 
+namespace detail {
+  // is_pointerlike_helper enables Signals library to recognize shared_ptr
+  template<typename T>
+  type_traits::yes_type is_pointerlike_helper(const shared_ptr<T>&, int);
+} // end namespace detail
+
 // shared_from_this() creates a shared_ptr from a raw pointer (usually 'this')
 
 namespace detail
diff --git a/include/boost/weak_ptr.hpp b/include/boost/weak_ptr.hpp
index e04b4f1..dc11ca0 100644
--- a/include/boost/weak_ptr.hpp
+++ b/include/boost/weak_ptr.hpp
@@ -168,6 +168,19 @@ template<class T> shared_ptr<T> make_shared(weak_ptr<T> const & r) // never thro
     }
 }
 
+// mem_fn support
+
+template<class T> T * get_pointer(weak_ptr<T> const & p)
+{
+    return p.get();
+}
+
+namespace detail {
+  // is_pointerlike_helper enables Signals library to recognize intrusive_ptr
+  template<typename T>
+  type_traits::yes_type is_pointerlike_helper(const weak_ptr<T>&, int);
+} // end namespace detail
+
 } // namespace boost
 
 #ifdef BOOST_MSVC