Added boost header

test/external/boost/python/with_custodian_and_ward.hpp

@@ -0,0 +1,125 @@
+// 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 WITH_CUSTODIAN_AND_WARD_DWA2002131_HPP
+# define WITH_CUSTODIAN_AND_WARD_DWA2002131_HPP
+
+# include <boost/python/detail/prefix.hpp>
+
+# include <boost/python/default_call_policies.hpp>
+# include <boost/python/object/life_support.hpp>
+# include <algorithm>
+
+namespace boost { namespace python { 
+
+namespace detail
+{
+  template <std::size_t N>
+  struct get_prev
+  {
+      template <class ArgumentPackage>
+      static PyObject* execute(ArgumentPackage const& args, PyObject* = 0)
+      {
+          int const pre_n = static_cast<int>(N) - 1; // separate line is gcc-2.96 workaround
+          return detail::get(mpl::int_<pre_n>(), args);
+      }
+  };
+  template <>
+  struct get_prev<0>
+  {
+      template <class ArgumentPackage>
+      static PyObject* execute(ArgumentPackage const&, PyObject* zeroth)
+      {
+          return zeroth;
+      }
+  };
+}
+template <
+    std::size_t custodian
+  , std::size_t ward
+  , class BasePolicy_ = default_call_policies
+>
+struct with_custodian_and_ward : BasePolicy_
+{
+    BOOST_STATIC_ASSERT(custodian != ward);
+    BOOST_STATIC_ASSERT(custodian > 0);
+    BOOST_STATIC_ASSERT(ward > 0);
+
+    template <class ArgumentPackage>
+    static bool precall(ArgumentPackage const& args_)
+    {
+        unsigned arity_ = detail::arity(args_);
+        if (custodian > arity_ || ward > arity_)
+        {
+            PyErr_SetString(
+                PyExc_IndexError
+              , "boost::python::with_custodian_and_ward: argument index out of range"
+            );
+            return false;
+        }
+
+        PyObject* patient = detail::get_prev<ward>::execute(args_);
+        PyObject* nurse = detail::get_prev<custodian>::execute(args_);
+
+        PyObject* life_support = python::objects::make_nurse_and_patient(nurse, patient);
+        if (life_support == 0)
+            return false;
+    
+        bool result = BasePolicy_::precall(args_);
+
+        if (!result) {
+            Py_DECREF(life_support);
+        }
+    
+        return result;
+    }
+};
+
+template <std::size_t custodian, std::size_t ward, class BasePolicy_ = default_call_policies>
+struct with_custodian_and_ward_postcall : BasePolicy_
+{
+    BOOST_STATIC_ASSERT(custodian != ward);
+    
+    template <class ArgumentPackage>
+    static PyObject* postcall(ArgumentPackage const& args_, PyObject* result)
+    {
+        std::size_t arity_ = detail::arity(args_);
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+        if ( custodian > arity_ || ward > arity_ )
+#else
+        // check if either custodian or ward exceeds the arity
+        // (this weird formulation avoids "always false" warnings
+        // for arity_ = 0)
+        if ( (std::max)(custodian, ward) > arity_ )
+#endif
+        {
+            PyErr_SetString(
+                PyExc_IndexError
+              , "boost::python::with_custodian_and_ward_postcall: argument index out of range"
+            );
+            return 0;
+        }
+        
+        PyObject* patient = detail::get_prev<ward>::execute(args_, result);
+        PyObject* nurse = detail::get_prev<custodian>::execute(args_, result);
+
+        if (nurse == 0) return 0;
+    
+        result = BasePolicy_::postcall(args_, result);
+        if (result == 0)
+            return 0;
+            
+        if (python::objects::make_nurse_and_patient(nurse, patient) == 0)
+        {
+            Py_XDECREF(result);
+            return 0;
+        }
+        return result;
+    }
+};
+
+
+}} // namespace boost::python
+
+#endif // WITH_CUSTODIAN_AND_WARD_DWA2002131_HPP