ceph/src/boost/boost/python/def.hpp

   1 // Copyright David Abrahams 2002.
   2 // Distributed under the Boost Software License, Version 1.0. (See
   3 // accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5 #ifndef DEF_DWA200292_HPP
   6 # define DEF_DWA200292_HPP
   7
   8 # include <boost/python/detail/prefix.hpp>
   9
  10 # include <boost/python/object_fwd.hpp>
  11 # include <boost/python/make_function.hpp>
  12 # include <boost/python/detail/def_helper.hpp>
  13 # include <boost/python/detail/overloads_fwd.hpp>
  14 # include <boost/python/scope.hpp>
  15 # include <boost/python/signature.hpp>
  16 # include <boost/python/detail/scope.hpp>
  17
  18 namespace boost { namespace python {
  19
  20 namespace detail
  21 {
  22   namespace error
  23   {
  24     // Compile-time error messages
  25     template <bool> struct multiple_functions_passed_to_def;
  26     template <> struct multiple_functions_passed_to_def<false> { typedef char type; };
  27   }
  28
  29   //
  30   // def_from_helper --
  31   //
  32   // Use a def_helper to define a regular wrapped function in the current scope.
  33   template <class F, class Helper>
  34   void def_from_helper(
  35       char const* name, F const& fn, Helper const& helper)
  36   {
  37       // Must not try to use default implementations except with method definitions.
  38       typedef typename error::multiple_functions_passed_to_def<
  39           Helper::has_default_implementation
  40           >::type assertion BOOST_ATTRIBUTE_UNUSED;
  41
  42       detail::scope_setattr_doc(
  43           name, boost::python::make_function(
  44               fn
  45               , helper.policies()
  46               , helper.keywords())
  47           , helper.doc()
  48           );
  49   }
  50
  51   //
  52   // These two overloads discriminate between def() as applied to
  53   // regular functions and def() as applied to the result of
  54   // BOOST_PYTHON_FUNCTION_OVERLOADS(). The final argument is used to
  55   // discriminate.
  56   //
  57   template <class Fn, class A1>
  58   void
  59   def_maybe_overloads(
  60       char const* name
  61       , Fn fn
  62       , A1 const& a1
  63       , ...)
  64   {
  65       detail::def_from_helper(name, fn, def_helper<A1>(a1));
  66   }
  67
  68   template <class StubsT, class SigT>
  69   void def_maybe_overloads(
  70       char const* name
  71       , SigT sig
  72       , StubsT const& stubs
  73       , detail::overloads_base const*)
  74   {
  75       scope current;
  76
  77       detail::define_with_defaults(
  78           name, stubs, current, detail::get_signature(sig));
  79   }
  80
  81   template <class T>
  82   object make_function1(T fn, ...) { return make_function(fn); }
  83
  84   inline
  85   object make_function1(object const& x, object const*) { return x; }
  86 }
  87
  88 template <class Fn>
  89 void def(char const* name, Fn fn)
  90 {
  91     detail::scope_setattr_doc(name, detail::make_function1(fn, &fn), 0);
  92 }
  93
  94 template <class Arg1T, class Arg2T>
  95 void def(char const* name, Arg1T arg1, Arg2T const& arg2)
  96 {
  97     detail::def_maybe_overloads(name, arg1, arg2, &arg2);
  98 }
  99
 100 template <class F, class A1, class A2>
 101 void def(char const* name, F f, A1 const& a1, A2 const& a2)
 102 {
 103     detail::def_from_helper(name, f, detail::def_helper<A1,A2>(a1,a2));
 104 }
 105
 106 template <class F, class A1, class A2, class A3>
 107 void def(char const* name, F f, A1 const& a1, A2 const& a2, A3 const& a3)
 108 {
 109     detail::def_from_helper(name, f, detail::def_helper<A1,A2,A3>(a1,a2,a3));
 110 }
 111
 112 }} // namespace boost::python
 113
 114 #endif // DEF_DWA200292_HPP