diff --git a/include/boost/smart_ptr/detail/shared_count.hpp b/include/boost/smart_ptr/detail/shared_count.hpp
index a3ae638..8dab621 100644
--- a/include/boost/smart_ptr/detail/shared_count.hpp
+++ b/include/boost/smart_ptr/detail/shared_count.hpp
@@ -22,28 +22,25 @@
 # pragma warn -8027     // Functions containing try are not expanded inline
 #endif
 
-#include <boost/config.hpp>
-#include <boost/checked_delete.hpp>
-#include <boost/throw_exception.hpp>
 #include <boost/smart_ptr/bad_weak_ptr.hpp>
 #include <boost/smart_ptr/detail/sp_counted_base.hpp>
 #include <boost/smart_ptr/detail/sp_counted_impl.hpp>
 #include <boost/smart_ptr/detail/sp_disable_deprecated.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
+#include <boost/checked_delete.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/core/addressof.hpp>
+#include <boost/config.hpp>
 #include <boost/config/workaround.hpp>
-// In order to avoid circular dependencies with Boost.TR1
-// we make sure that our include of <memory> doesn't try to
-// pull in the TR1 headers: that's why we use this header 
-// rather than including <memory> directly:
-#include <boost/config/no_tr1/memory.hpp>  // std::auto_ptr
-#include <functional>       // std::less
+#include <boost/cstdint.hpp>
+#include <memory>            // std::auto_ptr
+#include <functional>        // std::less
+#include <cstddef>           // std::size_t
 
 #ifdef BOOST_NO_EXCEPTIONS
 # include <new>              // std::bad_alloc
 #endif
 
-#include <boost/core/addressof.hpp>
-
 #if defined( BOOST_SP_DISABLE_DEPRECATED )
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
@@ -103,6 +100,14 @@ template< class D > struct sp_convert_reference< D& >
     typedef sp_reference_wrapper< D > type;
 };
 
+template<class T> std::size_t sp_hash_pointer( T* p ) BOOST_NOEXCEPT
+{
+    boost::uintptr_t v = reinterpret_cast<boost::uintptr_t>( p );
+
+    // match boost::hash<T*>
+    return static_cast<std::size_t>( v + ( v >> 3 ) );
+}
+
 class weak_count;
 
 class shared_count
@@ -517,6 +522,11 @@ public:
     {
         return pi_? pi_->get_untyped_deleter(): 0;
     }
+
+    std::size_t hash_value() const BOOST_SP_NOEXCEPT
+    {
+        return sp_hash_pointer( pi_ );
+    }
 };
 
 
@@ -643,6 +653,11 @@ public:
     {
         return std::less<sp_counted_base *>()( pi_, r.pi_ );
     }
+
+    std::size_t hash_value() const BOOST_SP_NOEXCEPT
+    {
+        return sp_hash_pointer( pi_ );
+    }
 };
 
 inline shared_count::shared_count( weak_count const & r ): pi_( r.pi_ )
diff --git a/include/boost/smart_ptr/detail/sp_counted_impl.hpp b/include/boost/smart_ptr/detail/sp_counted_impl.hpp
index 1a46fb8..56b9efa 100644
--- a/include/boost/smart_ptr/detail/sp_counted_impl.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_impl.hpp
@@ -18,25 +18,21 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 //
 
-#include <boost/config.hpp>
-
 #if defined(BOOST_SP_USE_STD_ALLOCATOR) && defined(BOOST_SP_USE_QUICK_ALLOCATOR)
 # error BOOST_SP_USE_STD_ALLOCATOR and BOOST_SP_USE_QUICK_ALLOCATOR are incompatible.
 #endif
 
-#include <boost/checked_delete.hpp>
 #include <boost/smart_ptr/detail/sp_counted_base.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
+#include <boost/checked_delete.hpp>
 #include <boost/core/addressof.hpp>
+#include <boost/config.hpp>
 
 #if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
 #include <boost/smart_ptr/detail/quick_allocator.hpp>
 #endif
 
-#if defined(BOOST_SP_USE_STD_ALLOCATOR)
-#include <memory>           // std::allocator
-#endif
-
+#include <memory>           // std::allocator, std::allocator_traits
 #include <cstddef>          // std::size_t
 
 namespace boost
diff --git a/include/boost/smart_ptr/shared_ptr.hpp b/include/boost/smart_ptr/shared_ptr.hpp
index c8b2885..4264b06 100644
--- a/include/boost/smart_ptr/shared_ptr.hpp
+++ b/include/boost/smart_ptr/shared_ptr.hpp
@@ -14,23 +14,16 @@
 //  See http://www.boost.org/libs/smart_ptr/ for documentation.
 //
 
-#include <boost/config.hpp>   // for broken compiler workarounds
-
-// In order to avoid circular dependencies with Boost.TR1
-// we make sure that our include of <memory> doesn't try to
-// pull in the TR1 headers: that's why we use this header 
-// rather than including <memory> directly:
-#include <boost/config/no_tr1/memory.hpp>  // std::auto_ptr
-
-#include <boost/assert.hpp>
-#include <boost/checked_delete.hpp>
-#include <boost/throw_exception.hpp>
 #include <boost/smart_ptr/detail/shared_count.hpp>
-#include <boost/config/workaround.hpp>
 #include <boost/smart_ptr/detail/sp_convertible.hpp>
 #include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
 #include <boost/smart_ptr/detail/sp_disable_deprecated.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
+#include <boost/checked_delete.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
 
 #if !defined(BOOST_SP_NO_ATOMIC_ACCESS)
 #include <boost/smart_ptr/detail/spinlock_pool.hpp>
@@ -40,6 +33,7 @@
 #include <functional>           // for std::less
 #include <typeinfo>             // for std::bad_cast
 #include <cstddef>              // for std::size_t
+#include <memory>               // for std::auto_ptr
 
 #if !defined(BOOST_NO_IOSTREAM)
 #if !defined(BOOST_NO_IOSFWD)
@@ -787,6 +781,11 @@ public:
         return pn == rhs.pn;
     }
 
+    std::size_t owner_hash_value() const BOOST_SP_NOEXCEPT
+    {
+        return pn.hash_value();
+    }
+
     void * _internal_get_deleter( boost::detail::sp_typeinfo_ const & ti ) const BOOST_SP_NOEXCEPT
     {
         return pn.get_deleter( ti );
diff --git a/include/boost/smart_ptr/weak_ptr.hpp b/include/boost/smart_ptr/weak_ptr.hpp
index ddc8bfb..16eea67 100644
--- a/include/boost/smart_ptr/weak_ptr.hpp
+++ b/include/boost/smart_ptr/weak_ptr.hpp
@@ -13,10 +13,11 @@
 //  See http://www.boost.org/libs/smart_ptr/ for documentation.
 //
 
-#include <memory> // boost.TR1 include order fix
 #include <boost/smart_ptr/detail/shared_count.hpp>
 #include <boost/smart_ptr/shared_ptr.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
+#include <memory>
+#include <cstddef>
 
 namespace boost
 {
@@ -247,6 +248,11 @@ public:
         return pn == rhs.pn;
     }
 
+    std::size_t owner_hash_value() const BOOST_SP_NOEXCEPT
+    {
+        return pn.hash_value();
+    }
+
 // Tasteless as this may seem, making all members public allows member templates
 // to work in the absence of member template friends. (Matthew Langston)
 
@@ -280,6 +286,40 @@ template<class T> weak_ptr( shared_ptr<T> ) -> weak_ptr<T>;
 
 #endif
 
+// hash_value
+
+template< class T > std::size_t hash_value( boost::weak_ptr<T> const & p ) BOOST_SP_NOEXCEPT
+{
+    return p.owner_hash_value();
+}
+
 } // namespace boost
 
+// std::hash, std::equal_to
+
+namespace std
+{
+
+#if !defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
+
+template<class T> struct hash< ::boost::weak_ptr<T> >
+{
+    std::size_t operator()( ::boost::weak_ptr<T> const & p ) const BOOST_SP_NOEXCEPT
+    {
+        return p.owner_hash_value();
+    }
+};
+
+#endif // #if !defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
+
+template<class T> struct equal_to< ::boost::weak_ptr<T> >
+{
+    bool operator()( ::boost::weak_ptr<T> const & a, ::boost::weak_ptr<T> const & b ) const BOOST_SP_NOEXCEPT
+    {
+        return a.owner_equals( b );
+    }
+};
+
+} // namespace std
+
 #endif  // #ifndef BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED
diff --git a/test/Jamfile b/test/Jamfile
index 3619273..69938e1 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -398,3 +398,8 @@ run weak_ptr_mt_test.cpp
   : : : <threading>multi ;
 
 compile sp_report_implementation.cpp ;
+
+run sp_owner_hash_value_test.cpp ;
+
+run wp_hash_test.cpp ;
+run wp_hash_test2.cpp ;
diff --git a/test/sp_owner_hash_value_test.cpp b/test/sp_owner_hash_value_test.cpp
new file mode 100644
index 0000000..d1912b9
--- /dev/null
+++ b/test/sp_owner_hash_value_test.cpp
@@ -0,0 +1,85 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+int main()
+{
+    {
+        boost::shared_ptr<int> p1( new int );
+        boost::shared_ptr<int> p2( p1 );
+
+        BOOST_TEST_EQ( p1.owner_hash_value(), p2.owner_hash_value() );
+
+        boost::shared_ptr<int> p3( new int );
+
+        BOOST_TEST_NE( p1.owner_hash_value(), p3.owner_hash_value() );
+
+        boost::shared_ptr<int> p4;
+        boost::shared_ptr<int> p5;
+
+        BOOST_TEST_EQ( p4.owner_hash_value(), p5.owner_hash_value() );
+        BOOST_TEST_NE( p4.owner_hash_value(), p3.owner_hash_value() );
+
+        boost::shared_ptr<int> p6( static_cast<int*>(0) );
+
+        BOOST_TEST_NE( p4.owner_hash_value(), p6.owner_hash_value() );
+
+        boost::shared_ptr<void> p7( p1 );
+
+        BOOST_TEST_EQ( p1.owner_hash_value(), p7.owner_hash_value() );
+
+        boost::shared_ptr<void> p8;
+
+        BOOST_TEST_NE( p1.owner_hash_value(), p8.owner_hash_value() );
+        BOOST_TEST_EQ( p4.owner_hash_value(), p8.owner_hash_value() );
+
+        boost::weak_ptr<int> q1( p1 );
+
+        BOOST_TEST_EQ( p1.owner_hash_value(), q1.owner_hash_value() );
+
+        boost::weak_ptr<int> q2( p1 );
+
+        BOOST_TEST_EQ( q1.owner_hash_value(), q2.owner_hash_value() );
+
+        boost::weak_ptr<int> q3( p3 );
+
+        BOOST_TEST_NE( p1.owner_hash_value(), q3.owner_hash_value() );
+        BOOST_TEST_NE( q1.owner_hash_value(), q3.owner_hash_value() );
+
+        boost::weak_ptr<int> q4;
+
+        BOOST_TEST_EQ( p4.owner_hash_value(), q4.owner_hash_value() );
+        BOOST_TEST_NE( q1.owner_hash_value(), q4.owner_hash_value() );
+
+        boost::weak_ptr<void> q5;
+
+        BOOST_TEST_EQ( q4.owner_hash_value(), q5.owner_hash_value() );
+
+        boost::weak_ptr<void> q7( p7 );
+
+        BOOST_TEST_EQ( p1.owner_hash_value(), q7.owner_hash_value() );
+        BOOST_TEST_EQ( q1.owner_hash_value(), q7.owner_hash_value() );
+
+        p1.reset();
+        p2.reset();
+        p3.reset();
+        p7.reset();
+
+        BOOST_TEST( q1.expired() );
+        BOOST_TEST( q2.expired() );
+        BOOST_TEST( q3.expired() );
+        BOOST_TEST( q7.expired() );
+
+        BOOST_TEST_EQ( q1.owner_hash_value(), q2.owner_hash_value() );
+        BOOST_TEST_EQ( q1.owner_hash_value(), q7.owner_hash_value() );
+
+        BOOST_TEST_NE( q1.owner_hash_value(), q3.owner_hash_value() );
+        BOOST_TEST_NE( q1.owner_hash_value(), q4.owner_hash_value() );
+    }
+
+    return boost::report_errors();
+}
diff --git a/test/wp_hash_test.cpp b/test/wp_hash_test.cpp
new file mode 100644
index 0000000..b4b2878
--- /dev/null
+++ b/test/wp_hash_test.cpp
@@ -0,0 +1,76 @@
+// Copyright 2011, 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/weak_ptr.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/functional/hash.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+int main()
+{
+    {
+        boost::hash< boost::weak_ptr<int> > hasher;
+
+        boost::shared_ptr<int> p1, p2( p1 ), p3( new int ), p4( p3 ), p5( new int );
+        boost::weak_ptr<int> q1( p1 ), q2( p2 ), q3( p3 ), q4( p4 ), q5( p5 );
+
+        BOOST_TEST_EQ( hasher( q1 ), hasher( q2 ) );
+        BOOST_TEST_NE( hasher( q1 ), hasher( q3 ) );
+        BOOST_TEST_EQ( hasher( q3 ), hasher( q4 ) );
+        BOOST_TEST_NE( hasher( q3 ), hasher( q5 ) );
+
+        p3.reset();
+        p4.reset();
+        p5.reset();
+
+        BOOST_TEST_EQ( hasher( q1 ), hasher( q2 ) );
+        BOOST_TEST_NE( hasher( q1 ), hasher( q3 ) );
+        BOOST_TEST_EQ( hasher( q3 ), hasher( q4 ) );
+        BOOST_TEST_NE( hasher( q3 ), hasher( q5 ) );
+    }
+
+    {
+        boost::hash< boost::weak_ptr<int[]> > hasher;
+
+        boost::shared_ptr<int[]> p1, p2( p1 ), p3( new int[1] ), p4( p3 ), p5( new int[1] );
+        boost::weak_ptr<int[]> q1( p1 ), q2( p2 ), q3( p3 ), q4( p4 ), q5( p5 );
+
+        BOOST_TEST_EQ( hasher( q1 ), hasher( q2 ) );
+        BOOST_TEST_NE( hasher( q1 ), hasher( q3 ) );
+        BOOST_TEST_EQ( hasher( q3 ), hasher( q4 ) );
+        BOOST_TEST_NE( hasher( q3 ), hasher( q5 ) );
+
+        p3.reset();
+        p4.reset();
+        p5.reset();
+
+        BOOST_TEST_EQ( hasher( q1 ), hasher( q2 ) );
+        BOOST_TEST_NE( hasher( q1 ), hasher( q3 ) );
+        BOOST_TEST_EQ( hasher( q3 ), hasher( q4 ) );
+        BOOST_TEST_NE( hasher( q3 ), hasher( q5 ) );
+    }
+
+    {
+        boost::hash< boost::weak_ptr<int[1]> > hasher;
+
+        boost::shared_ptr<int[1]> p1, p2( p1 ), p3( new int[1] ), p4( p3 ), p5( new int[1] );
+        boost::weak_ptr<int[1]> q1( p1 ), q2( p2 ), q3( p3 ), q4( p4 ), q5( p5 );
+
+        BOOST_TEST_EQ( hasher( q1 ), hasher( q2 ) );
+        BOOST_TEST_NE( hasher( q1 ), hasher( q3 ) );
+        BOOST_TEST_EQ( hasher( q3 ), hasher( q4 ) );
+        BOOST_TEST_NE( hasher( q3 ), hasher( q5 ) );
+
+        p3.reset();
+        p4.reset();
+        p5.reset();
+
+        BOOST_TEST_EQ( hasher( q1 ), hasher( q2 ) );
+        BOOST_TEST_NE( hasher( q1 ), hasher( q3 ) );
+        BOOST_TEST_EQ( hasher( q3 ), hasher( q4 ) );
+        BOOST_TEST_NE( hasher( q3 ), hasher( q5 ) );
+    }
+
+    return boost::report_errors();
+}
diff --git a/test/wp_hash_test2.cpp b/test/wp_hash_test2.cpp
new file mode 100644
index 0000000..77db2fd
--- /dev/null
+++ b/test/wp_hash_test2.cpp
@@ -0,0 +1,61 @@
+// Copyright 2011, 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/weak_ptr.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <functional>
+
+#if defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)
+
+int main() {}
+
+#else
+
+int main()
+{
+    {
+        boost::shared_ptr<int> p1, p2( new int );
+        boost::weak_ptr<int> q1( p1 ), q2( p2 ), q3;
+
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int> >()( q1 ), q1.owner_hash_value() );
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int> >()( q2 ), q2.owner_hash_value() );
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int> >()( q3 ), q3.owner_hash_value() );
+
+        p2.reset();
+
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int> >()( q2 ), q2.owner_hash_value() );
+    }
+
+    {
+        boost::shared_ptr<int[]> p1, p2( new int[1] );
+        boost::weak_ptr<int[]> q1( p1 ), q2( p2 ), q3;
+
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int[]> >()( q1 ), q1.owner_hash_value() );
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int[]> >()( q2 ), q2.owner_hash_value() );
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int[]> >()( q3 ), q3.owner_hash_value() );
+
+        p2.reset();
+
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int[]> >()( q2 ), q2.owner_hash_value() );
+    }
+
+    {
+        boost::shared_ptr<int[1]> p1, p2( new int[1] );
+        boost::weak_ptr<int[1]> q1( p1 ), q2( p2 ), q3;
+
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int[1]> >()( q1 ), q1.owner_hash_value() );
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int[1]> >()( q2 ), q2.owner_hash_value() );
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int[1]> >()( q3 ), q3.owner_hash_value() );
+
+        p2.reset();
+
+        BOOST_TEST_EQ( std::hash< boost::weak_ptr<int[1]> >()( q2 ), q2.owner_hash_value() );
+    }
+
+    return boost::report_errors();
+}
+
+#endif // #if defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)