Added boost header

test/external/boost/python/back_reference.hpp

@@ -0,0 +1,102 @@
+// Copyright David Abrahams 2002.
+// Distributed under 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)
+#ifndef BACK_REFERENCE_DWA2002510_HPP
+# define BACK_REFERENCE_DWA2002510_HPP
+
+# include <boost/python/detail/prefix.hpp>
+
+# include <boost/python/object_fwd.hpp>
+# include <boost/python/detail/dependent.hpp>
+# include <boost/python/detail/raw_pyobject.hpp>
+
+namespace boost { namespace python { 
+
+template <class T>
+struct back_reference
+{
+ private: // types
+    typedef typename detail::dependent<object,T>::type source_t;
+ public:
+    typedef T type;
+    
+    back_reference(PyObject*, T);
+    source_t const& source() const;
+    T get() const;
+ private:
+    source_t m_source;
+    T m_value;
+};
+
+# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+template<typename T>
+class is_back_reference
+{
+ public:
+    BOOST_STATIC_CONSTANT(bool, value = false); 
+};
+
+template<typename T>
+class is_back_reference<back_reference<T> >
+{
+ public:
+    BOOST_STATIC_CONSTANT(bool, value = true);
+};
+
+# else // no partial specialization
+
+}} // namespace boost::python
+
+#include <boost/type.hpp>
+
+namespace boost { namespace python {
+
+namespace detail
+{
+  typedef char (&yes_back_reference_t)[1];
+  typedef char (&no_back_reference_t)[2];
+      
+  no_back_reference_t is_back_reference_test(...);
+
+  template<typename T>
+  yes_back_reference_t is_back_reference_test(boost::type< back_reference<T> >);
+}
+
+template<typename T>
+class is_back_reference
+{
+ public:
+    BOOST_STATIC_CONSTANT(
+        bool, value = (
+            sizeof(detail::is_back_reference_test(boost::type<T>()))
+            == sizeof(detail::yes_back_reference_t)));
+};
+
+# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+//
+// implementations
+//
+template <class T>
+back_reference<T>::back_reference(PyObject* p, T x)
+    : m_source(detail::borrowed_reference(p))
+      , m_value(x)
+{
+}
+
+template <class T>
+typename back_reference<T>::source_t const& back_reference<T>::source() const
+{
+    return m_source;
+}
+
+template <class T>
+T back_reference<T>::get() const
+{
+    return m_value;
+}
+
+}} // namespace boost::python
+
+#endif // BACK_REFERENCE_DWA2002510_HPP