Fix autoptr/unique_ptr ifdef for VS2017.

Author: garyfurnish

include/boost/python/make_constructor.hpp

@@ -45,7 +45,7 @@ namespace detail
       template <class U>
       void dispatch(U* x, detail::true_) const
       {
-#if __cplusplus < 201103L
+#if defined(BOOST_NO_CXX11_SMART_PTR)
 	std::auto_ptr<U> owner(x);
 	dispatch(owner, detail::false_());
 #else
@@ -63,7 +63,7 @@ namespace detail
 
           void* memory = holder::allocate(this->m_self, offsetof(instance_t, storage), sizeof(holder));
           try {
-#if __cplusplus < 201103L
+#if defined(BOOST_NO_CXX11_SMART_PTR)
               (new (memory) holder(x))->install(this->m_self);
 #else
               (new (memory) holder(std::move(x)))->install(this->m_self);

include/boost/python/object/make_ptr_instance.hpp

@@ -21,7 +21,7 @@ struct make_ptr_instance
     template <class Arg>
     static inline Holder* construct(void* storage, PyObject*, Arg& x)
     {
-#if __cplusplus < 201103L
+#if defined(BOOST_NO_CXX11_SMART_PTR)
       return new (storage) Holder(x);
 #else
       return new (storage) Holder(std::move(x));

include/boost/python/object/pointer_holder.hpp

@@ -106,7 +106,7 @@ struct pointer_holder_back_reference : instance_holder
 
 template <class Pointer, class Value>
 inline pointer_holder<Pointer,Value>::pointer_holder(Pointer p)
-#if __cplusplus < 201103L
+#if defined(BOOST_NO_CXX11_SMART_PTR)
     : m_p(p)
 #else
     : m_p(std::move(p))
@@ -116,7 +116,7 @@ inline pointer_holder<Pointer,Value>::pointer_holder(Pointer p)
 
 template <class Pointer, class Value>
 inline pointer_holder_back_reference<Pointer,Value>::pointer_holder_back_reference(Pointer p)
-#if __cplusplus < 201103L
+#if defined(BOOST_NO_CXX11_SMART_PTR)
     : m_p(p)
 #else
     : m_p(std::move(p))

include/boost/python/object/py_function.hpp

@@ -135,7 +135,7 @@ struct py_function
     {}
 
     py_function(py_function const& rhs)
-#if __cplusplus < 201103L
+#if defined(BOOST_NO_CXX11_SMART_PTR)
       : m_impl(rhs.m_impl)
 #else
       : m_impl(std::move(rhs.m_impl))
@@ -168,7 +168,7 @@ struct py_function
     }
 
  private:
-#if __cplusplus < 201103L
+#if defined(BOOST_NO_CXX11_SMART_PTR)
     mutable std::auto_ptr<py_function_impl_base> m_impl;
 #else
     mutable std::unique_ptr<py_function_impl_base> m_impl;