diff --git a/doc/91_relnotes.qbk b/doc/91_relnotes.qbk
index 228760d..d34861b 100644
--- a/doc/91_relnotes.qbk
+++ b/doc/91_relnotes.qbk
@@ -11,6 +11,12 @@
 
 [section:relnotes Release Notes]
 
+[heading Boost Release 1.67]
+
+* Fixed [@https://github.com/boostorg/optional/issues/46 issue #46].
+* Fixed `-Wzero-as-null-pointer-constant` warnings.
+
+
 [heading Boost Release 1.66]
 
 * On newer compilers `optional` is now trivially-copyable for scalar `T`s. This uses a different storage (just `T` rather than `aligned_storage`). We require the compiler to support defaulted functions.
diff --git a/include/boost/optional/detail/old_optional_implementation.hpp b/include/boost/optional/detail/old_optional_implementation.hpp
index 4e888ed..62c31ee 100644
--- a/include/boost/optional/detail/old_optional_implementation.hpp
+++ b/include/boost/optional/detail/old_optional_implementation.hpp
@@ -147,7 +147,7 @@ class optional_base : public optional_tag
     }
 #endif
 
-    // Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialzed optional<T>.
+    // Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialized optional<T>.
     // Can throw if T::T(T const&) does
     optional_base ( bool cond, argument_type val )
       :
@@ -730,7 +730,7 @@ class optional : public optional_detail::optional_base<T>
   explicit optional ( Expr&& expr, 
                       BOOST_DEDUCED_TYPENAME boost::disable_if_c<
                         (boost::is_base_of<optional_detail::optional_tag, BOOST_DEDUCED_TYPENAME boost::decay<Expr>::type>::value) || 
-                        boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<Expr>::type, none_t>::value >::type* = 0 
+                        boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<Expr>::type, none_t>::value, bool >::type = true 
   ) 
     : base(boost::forward<Expr>(expr),boost::addressof(expr)) 
     {optional_detail::prevent_binding_rvalue_ref_to_optional_lvalue_ref<T, Expr&&>();}
diff --git a/include/boost/optional/detail/optional_reference_spec.hpp b/include/boost/optional/detail/optional_reference_spec.hpp
index ce55875..012e91a 100644
--- a/include/boost/optional/detail/optional_reference_spec.hpp
+++ b/include/boost/optional/detail/optional_reference_spec.hpp
@@ -132,11 +132,11 @@ public:
     
     // the following two implement a 'conditionally explicit' constructor: condition is a hack for buggy compilers with srewed conversion construction from const int
     template <class U>
-      explicit optional(U& rhs, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::is_same_decayed<T, U>::value && detail::is_const_integral_bad_for_conversion<U>::value>::type* = 0) BOOST_NOEXCEPT
+      explicit optional(U& rhs, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::is_same_decayed<T, U>::value && detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT
       : ptr_(boost::addressof(rhs)) {}
       
     template <class U>
-      optional(U& rhs, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::is_same_decayed<T, U>::value && !detail::is_const_integral_bad_for_conversion<U>::value>::type* = 0) BOOST_NOEXCEPT
+      optional(U& rhs, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::is_same_decayed<T, U>::value && !detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT
       : ptr_(boost::addressof(rhs)) {}
 
     optional& operator=(const optional& rhs) BOOST_NOEXCEPT { ptr_ = rhs.get_ptr(); return *this; }
@@ -165,11 +165,11 @@ public:
     optional(T&& /* rhs */) BOOST_NOEXCEPT { detail::prevent_binding_rvalue<T&&>(); }
     
     template <class R>
-        optional(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::no_unboxing_cond<T, R> >::type* = 0) BOOST_NOEXCEPT
+        optional(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::no_unboxing_cond<T, R>, bool>::type = true) BOOST_NOEXCEPT
         : ptr_(boost::addressof(r)) { detail::prevent_binding_rvalue<R>(); }
         
     template <class R>
-        optional(bool cond, R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R> >::type* = 0) BOOST_NOEXCEPT
+        optional(bool cond, R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) BOOST_NOEXCEPT
         : ptr_(cond ? boost::addressof(r) : 0) { detail::prevent_binding_rvalue<R>(); }
         
     template <class R>
@@ -177,19 +177,19 @@ public:
         operator=(R&& r) BOOST_NOEXCEPT { detail::prevent_binding_rvalue<R>(); ptr_ = boost::addressof(r); return *this; }
         
     template <class R>
-        void emplace(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R> >::type* = 0) BOOST_NOEXCEPT
+        void emplace(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) BOOST_NOEXCEPT
         { detail::prevent_binding_rvalue<R>(); ptr_ = boost::addressof(r); }
         
     template <class R>
-      T& get_value_or(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R> >::type* = 0) const BOOST_NOEXCEPT
+      T& get_value_or(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) const BOOST_NOEXCEPT
       { detail::prevent_binding_rvalue<R>(); return ptr_ ? *ptr_ : r; }
       
     template <class R>
-        T& value_or(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R> >::type* = 0) const BOOST_NOEXCEPT
+        T& value_or(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) const BOOST_NOEXCEPT
         { detail::prevent_binding_rvalue<R>(); return ptr_ ? *ptr_ : r; }
         
     template <class R>
-      void reset(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R> >::type* = 0) BOOST_NOEXCEPT
+      void reset(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) BOOST_NOEXCEPT
       { detail::prevent_binding_rvalue<R>(); ptr_ = boost::addressof(r); }
       
     template <class F>
@@ -200,15 +200,15 @@ public:
     
     // the following two implement a 'conditionally explicit' constructor
     template <class U>
-      explicit optional(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::no_unboxing_cond<T, U>::value && detail::is_const_integral_bad_for_conversion<U>::value >::type* = 0) BOOST_NOEXCEPT
+      explicit optional(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::no_unboxing_cond<T, U>::value && detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT
       : ptr_(boost::addressof(v)) { }
       
     template <class U>
-      optional(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::no_unboxing_cond<T, U>::value && !detail::is_const_integral_bad_for_conversion<U>::value >::type* = 0) BOOST_NOEXCEPT
+      optional(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::no_unboxing_cond<T, U>::value && !detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT
       : ptr_(boost::addressof(v)) { }
         
     template <class U>
-      optional(bool cond, U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U> >::type* = 0) BOOST_NOEXCEPT : ptr_(cond ? boost::addressof(v) : 0) {}
+      optional(bool cond, U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) BOOST_NOEXCEPT : ptr_(cond ? boost::addressof(v) : 0) {}
 
     template <class U>
       BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, optional<T&>&>::type
@@ -219,19 +219,19 @@ public:
       }
 
     template <class U>
-        void emplace(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U> >::type* = 0) BOOST_NOEXCEPT
+        void emplace(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) BOOST_NOEXCEPT
         { ptr_ = boost::addressof(v); }
         
     template <class U>
-      T& get_value_or(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U> >::type* = 0) const BOOST_NOEXCEPT
+      T& get_value_or(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) const BOOST_NOEXCEPT
       { return ptr_ ? *ptr_ : v; }
       
     template <class U>
-        T& value_or(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U> >::type* = 0) const BOOST_NOEXCEPT
+        T& value_or(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) const BOOST_NOEXCEPT
         { return ptr_ ? *ptr_ : v; }
         
     template <class U>
-      void reset(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U> >::type* = 0) BOOST_NOEXCEPT
+      void reset(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) BOOST_NOEXCEPT
       { ptr_ = boost::addressof(v); }
       
     template <class F>
diff --git a/include/boost/optional/optional.hpp b/include/boost/optional/optional.hpp
index c0f10e1..74ef49c 100644
--- a/include/boost/optional/optional.hpp
+++ b/include/boost/optional/optional.hpp
@@ -149,7 +149,7 @@ class optional_base : public optional_tag
     }
 #endif
 
-    // Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialzed optional<T>.
+    // Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialized optional<T>.
     // Can throw if T::T(T const&) does
     optional_base ( bool cond, argument_type val )
       :
@@ -160,7 +160,7 @@ class optional_base : public optional_tag
     }
 
 #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
-    // Creates an optional<T> initialized with 'move(val)' IFF cond is true, otherwise creates an uninitialzed optional<T>.
+    // Creates an optional<T> initialized with 'move(val)' IFF cond is true, otherwise creates an uninitialized optional<T>.
     // Can throw if T::T(T &&) does
     optional_base ( bool cond, rval_reference_type val )
       :
@@ -747,7 +747,7 @@ class optional_base : public optional_tag
 
   private :
 
-#if BOOST_WORKAROUND(BOOST_MSVC, <= 1600)
+#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1900))
     void destroy_impl ( ) { m_storage.ptr_ref()->~T() ; m_initialized = false ; }
 #else
     void destroy_impl ( ) { m_storage.ref().T::~T() ; m_initialized = false ; }
@@ -884,7 +884,7 @@ class optional
     template<class U>
     explicit optional ( optional<U> const& rhs
 #ifndef BOOST_OPTIONAL_DETAIL_NO_SFINAE_FRIENDLY_CONSTRUCTORS
-                        ,typename boost::enable_if< optional_detail::is_optional_constructible<T, U const&> >::type* = 0
+                        ,BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_constructible<T, U const&>, bool>::type = true
 #endif
                       )
       :
@@ -901,7 +901,7 @@ class optional
     template<class U>
     explicit optional ( optional<U> && rhs
 #ifndef BOOST_OPTIONAL_DETAIL_NO_SFINAE_FRIENDLY_CONSTRUCTORS
-                        ,typename boost::enable_if< optional_detail::is_optional_constructible<T, U> >::type* = 0
+                        ,BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_constructible<T, U>, bool>::type = true
 #endif
                       )
       :
@@ -927,7 +927,7 @@ class optional
 
   template<class Expr>
   explicit optional ( Expr&& expr, 
-                      BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_val_init_candidate<T, Expr> >::type* = 0 
+                      BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_val_init_candidate<T, Expr>, bool>::type = true 
   ) 
     : base(boost::forward<Expr>(expr),boost::addressof(expr)) 
     {}
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 129dd49..edc2e14 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -43,6 +43,7 @@ import testing ;
     [ run optional_test_emplace.cpp ]
     [ run optional_test_minimum_requirements.cpp ]
     [ run optional_test_msvc_bug_workaround.cpp ]
+    [ run optional_test_member_T.cpp ]
     [ run optional_test_tc_base.cpp ]
     [ compile optional_test_sfinae_friendly_ctor.cpp ]
     [ compile-fail optional_test_ref_convert_assign_const_int_prevented.cpp ]
diff --git a/test/optional_test_member_T.cpp b/test/optional_test_member_T.cpp
new file mode 100644
index 0000000..325838d
--- /dev/null
+++ b/test/optional_test_member_T.cpp
@@ -0,0 +1,44 @@
+// Copyright (C) 2014 Andrzej Krzemienski.
+//
+// Use, modification, and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/optional/optional.hpp"
+
+#ifdef __BORLANDC__
+#pragma hdrstop
+#endif
+
+#include "boost/core/lightweight_test.hpp"
+
+struct Status
+{
+  enum T
+  {
+    DISCONNECTED,
+    CONNECTING,
+    CONNECTED,
+  };
+
+  T mValue;
+};
+
+void test_member_T()
+{
+  boost::optional<Status> x = Status();
+  x->mValue = Status::CONNECTED;
+  
+  BOOST_TEST(x->mValue == Status::CONNECTED);
+}
+
+int main()
+{
+  test_member_T();
+  return boost::report_errors();
+}