ceph/src/boost/libs/python/include/boost/python/to_python_converter.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 TO_PYTHON_CONVERTER_DWA200221_HPP
   6 # define TO_PYTHON_CONVERTER_DWA200221_HPP
   7
   8 # include <boost/python/detail/prefix.hpp>
   9
  10 # include <boost/python/converter/registry.hpp>
  11 # include <boost/python/converter/as_to_python_function.hpp>
  12 #ifndef BOOST_PYTHON_NO_PY_SIGNATURES
  13 # include <boost/python/converter/pytype_function.hpp>
  14 #endif
  15 # include <boost/python/type_id.hpp>
  16
  17 namespace boost { namespace python {
  18
  19 #if 0 //get_pytype member detection
  20 namespace detail
  21 {
  22     typedef char yes_type;
  23     typedef struct {char a[2]; } no_type;
  24     template<PyTypeObject const * (*f)()> struct test_get_pytype1 { };
  25     template<PyTypeObject * (*f)()>          struct test_get_pytype2 { };
  26
  27     template<class T> yes_type tester(test_get_pytype1<&T::get_pytype>*);
  28
  29     template<class T> yes_type tester(test_get_pytype2<&T::get_pytype>*);
  30
  31     template<class T> no_type tester(...);
  32
  33     template<class T>
  34     struct test_get_pytype_base
  35     {
  36         BOOST_STATIC_CONSTANT(bool, value= (sizeof(detail::tester<T>(0)) == sizeof(yes_type)));
  37     };
  38
  39     template<class T>
  40     struct test_get_pytype : boost::mpl::bool_<test_get_pytype_base<T>::value>
  41     {
  42     };
  43
  44 }
  45 #endif
  46
  47 template < class T, class Conversion, bool has_get_pytype=false >
  48 struct to_python_converter
  49 {
  50 #ifndef BOOST_PYTHON_NO_PY_SIGNATURES
  51     typedef boost::mpl::bool_<has_get_pytype> HasGetPytype;
  52
  53     static PyTypeObject const* get_pytype_1(boost::mpl::true_ *)
  54     {
  55         return Conversion::get_pytype();
  56     }
  57
  58     static PyTypeObject const* get_pytype_1(boost::mpl::false_ *)
  59     {
  60         return 0;
  61     }
  62     static PyTypeObject const* get_pytype_impl()
  63     {
  64         return get_pytype_1((HasGetPytype*)0);
  65     }
  66 #endif
  67
  68     to_python_converter();
  69 };
  70
  71 //
  72 // implementation
  73 //
  74
  75 template <class T, class Conversion ,bool has_get_pytype>
  76 to_python_converter<T,Conversion, has_get_pytype>::to_python_converter()
  77 {
  78     typedef converter::as_to_python_function<
  79         T, Conversion
  80         > normalized;
  81
  82     converter::registry::insert(
  83         &normalized::convert
  84         , type_id<T>()
  85 #ifndef BOOST_PYTHON_NO_PY_SIGNATURES
  86         , &get_pytype_impl
  87 #endif
  88         );
  89 }
  90
  91 }} // namespace boost::python
  92
  93 #endif // TO_PYTHON_CONVERTER_DWA200221_HPP
  94