comparison DEPENDENCIES/generic/include/boost/python/detail/def_helper.hpp @ 16:2665513ce2d3

Add boost headers

+// 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 DEF_HELPER_DWA200287_HPP
+# define DEF_HELPER_DWA200287_HPP
+
+# include <boost/python/args.hpp>
+# include <boost/type_traits/ice.hpp>
+# include <boost/type_traits/same_traits.hpp>
+# include <boost/python/detail/indirect_traits.hpp>
+# include <boost/mpl/not.hpp>
+# include <boost/mpl/and.hpp>
+# include <boost/mpl/or.hpp>
+# include <boost/type_traits/add_reference.hpp>
+# include <boost/mpl/lambda.hpp>
+# include <boost/mpl/apply.hpp>
+# include <boost/tuple/tuple.hpp>
+# include <boost/python/detail/not_specified.hpp>
+# include <boost/python/detail/def_helper_fwd.hpp>
+
+namespace boost { namespace python {
+
+struct default_call_policies;
+
+namespace detail
+{
+  // tuple_extract<Tuple,Predicate>::extract(t) returns the first
+  // element of a Tuple whose type E satisfies the given Predicate
+  // applied to add_reference<E>. The Predicate must be an MPL
+  // metafunction class.
+  template <class Tuple, class Predicate>
+  struct tuple_extract;
+
+  // Implementation class for when the tuple's head type does not
+  // satisfy the Predicate
+  template <bool matched>
+  struct tuple_extract_impl
+  {
+      template <class Tuple, class Predicate>
+      struct apply
+      {
+          typedef typename Tuple::head_type result_type;
+          
+          static typename Tuple::head_type extract(Tuple const& x)
+          {
+              return x.get_head();
+          }
+      };
+  };
+
+  // Implementation specialization for when the tuple's head type
+  // satisfies the predicate
+  template <>
+  struct tuple_extract_impl<false>
+  {
+      template <class Tuple, class Predicate>
+      struct apply
+      {
+          // recursive application of tuple_extract on the tail of the tuple
+          typedef tuple_extract<typename Tuple::tail_type, Predicate> next;
+          typedef typename next::result_type result_type;
+          
+          static result_type extract(Tuple const& x)
+          {
+              return next::extract(x.get_tail());
+          }
+      };
+  };
+
+  // A metafunction which selects a version of tuple_extract_impl to
+  // use for the implementation of tuple_extract
+  template <class Tuple, class Predicate>
+  struct tuple_extract_base_select
+  {
+      typedef typename Tuple::head_type head_type;
+      typedef typename mpl::apply1<Predicate, typename add_reference<head_type>::type>::type match_t;
+      BOOST_STATIC_CONSTANT(bool, match = match_t::value);
+      typedef typename tuple_extract_impl<match>::template apply<Tuple,Predicate> type;
+  };
+  
+  template <class Tuple, class Predicate>
+  struct tuple_extract
+      : tuple_extract_base_select<
+         Tuple
+         , typename mpl::lambda<Predicate>::type
+      >::type
+  {
+  };
+
+
+  //
+  // Specialized extractors for the docstring, keywords, CallPolicies,
+  // and default implementation of virtual functions
+  //
+
+  template <class Tuple>
+  struct doc_extract
+      : tuple_extract<
+        Tuple
+        , mpl::not_<
+           mpl::or_<
+               indirect_traits::is_reference_to_class<mpl::_1>
+             , indirect_traits::is_reference_to_member_function_pointer<mpl::_1 >
+           >
+        >
+     >
+  {
+  };
+  
+  template <class Tuple>
+  struct keyword_extract
+      : tuple_extract<Tuple, is_reference_to_keywords<mpl::_1 > >
+  {
+  };
+
+  template <class Tuple>
+  struct policy_extract
+      : tuple_extract<
+          Tuple
+          , mpl::and_<
+             mpl::not_<is_same<not_specified const&,mpl::_1> >
+              , indirect_traits::is_reference_to_class<mpl::_1 >
+              , mpl::not_<is_reference_to_keywords<mpl::_1 > >
+          >
+        >
+  {
+  };
+
+  template <class Tuple>
+  struct default_implementation_extract
+      : tuple_extract<
+          Tuple
+          , indirect_traits::is_reference_to_member_function_pointer<mpl::_1 >
+          >
+  {
+  };
+
+  //
+  // A helper class for decoding the optional arguments to def()
+  // invocations, which can be supplied in any order and are
+  // discriminated by their type properties. The template parameters
+  // are expected to be the types of the actual (optional) arguments
+  // passed to def().
+  //
+  template <class T1, class T2, class T3, class T4>
+  struct def_helper
+  {
+      // A tuple type which begins with references to the supplied
+      // arguments and ends with actual representatives of the default
+      // types.
+      typedef boost::tuples::tuple<
+          T1 const&
+          , T2 const&
+          , T3 const&
+          , T4 const&
+          , default_call_policies
+          , detail::keywords<0>
+          , char const*
+          , void(not_specified::*)()   // A function pointer type which is never an
+                                       // appropriate default implementation
+          > all_t;
+
+      // Constructors; these initialize an member of the tuple type
+      // shown above.
+      def_helper(T1 const& a1) : m_all(a1,m_nil,m_nil,m_nil) {}
+      def_helper(T1 const& a1, T2 const& a2) : m_all(a1,a2,m_nil,m_nil) {}
+      def_helper(T1 const& a1, T2 const& a2, T3 const& a3) : m_all(a1,a2,a3,m_nil) {}
+      def_helper(T1 const& a1, T2 const& a2, T3 const& a3, T4 const& a4) : m_all(a1,a2,a3,a4) {}
+
+   private: // types
+      typedef typename default_implementation_extract<all_t>::result_type default_implementation_t;
+      
+   public: // Constants which can be used for static assertions.
+
+      // Users must not supply a default implementation for non-class
+      // methods.
+      BOOST_STATIC_CONSTANT(
+          bool, has_default_implementation = (
+              !is_same<default_implementation_t, void(not_specified::*)()>::value));
+      
+   public: // Extractor functions which pull the appropriate value out
+           // of the tuple
+      char const* doc() const
+      {
+          return doc_extract<all_t>::extract(m_all);
+      }
+      
+      typename keyword_extract<all_t>::result_type keywords() const
+      {
+          return keyword_extract<all_t>::extract(m_all);
+      }
+      
+      typename policy_extract<all_t>::result_type policies() const
+      {
+          return policy_extract<all_t>::extract(m_all);
+      }
+
+      default_implementation_t default_implementation() const
+      {
+          return default_implementation_extract<all_t>::extract(m_all);
+      }
+      
+   private: // data members
+      all_t m_all; 
+      not_specified m_nil; // for filling in not_specified slots
+  };
+}
+
+}} // namespace boost::python::detail
+
+#endif // DEF_HELPER_DWA200287_HPP