*_ptr.hpp:

- Added detail::is_pointerlike_helper function templates for Signals

weak_ptr.hpp:
  - Added get_pointer function template for weak_ptr


[SVN r15099]

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