boost/python/object_operators.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 OBJECT_OPERATORS_DWA2002617_HPP
   6 # define OBJECT_OPERATORS_DWA2002617_HPP
   7
   8 # include <boost/python/detail/prefix.hpp>
   9
  10 # include <boost/python/object_core.hpp>
  11 # include <boost/python/call.hpp>
  12 # include <boost/iterator/detail/enable_if.hpp>
  13 # include <boost/mpl/bool.hpp>
  14
  15 # include <boost/iterator/detail/config_def.hpp>
  16
  17 namespace boost { namespace python { namespace api {
  18
  19 template <class X>
  20 char is_object_operators_helper(object_operators<X> const*);
  21
  22 typedef char (&no_type)[2];
  23 no_type is_object_operators_helper(...);
  24
  25 template <class X> X* make_ptr();
  26
  27 template <class L, class R = L>
  28 struct is_object_operators
  29 {
  30     enum {
  31         value
  32         = (sizeof(api::is_object_operators_helper(api::make_ptr<L>()))
  33            + sizeof(api::is_object_operators_helper(api::make_ptr<R>()))
  34            < 4
  35         )
  36     };
  37     typedef mpl::bool_<value> type;
  38 };
  39
  40 # if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_IS_CONVERTIBLE)
  41 template <class L, class R, class T>
  42 struct enable_binary
  43   : boost::iterators::enable_if<is_object_operators<L,R>, T>
  44 {};
  45 #  define BOOST_PYTHON_BINARY_RETURN(T) typename enable_binary<L,R,T>::type
  46 # else
  47 #  define BOOST_PYTHON_BINARY_RETURN(T) T
  48 # endif
  49
  50 template <class U>
  51 object object_operators<U>::operator()() const
  52 {
  53     object_cref2 f = *static_cast<U const*>(this);
  54     return call<object>(f.ptr());
  55 }
  56
  57
  58 template <class U>
  59 inline
  60 object_operators<U>::operator bool_type() const
  61 {
  62     object_cref2 x = *static_cast<U const*>(this);
  63     return PyObject_IsTrue(x.ptr()) ? &object::ptr : 0;
  64 }
  65
  66 template <class U>
  67 inline bool
  68 object_operators<U>::operator!() const
  69 {
  70     object_cref2 x = *static_cast<U const*>(this);
  71     return !PyObject_IsTrue(x.ptr());
  72 }
  73
  74 # define BOOST_PYTHON_COMPARE_OP(op, opid)                              \
  75 template <class L, class R>                                             \
  76 BOOST_PYTHON_BINARY_RETURN(object) operator op(L const& l, R const& r)    \
  77 {                                                                       \
  78     return PyObject_RichCompare(                                    \
  79         object(l).ptr(), object(r).ptr(), opid);                        \
  80 }
  81 # undef BOOST_PYTHON_COMPARE_OP
  82
  83 # define BOOST_PYTHON_BINARY_OPERATOR(op)                               \
  84 BOOST_PYTHON_DECL object operator op(object const& l, object const& r); \
  85 template <class L, class R>                                             \
  86 BOOST_PYTHON_BINARY_RETURN(object) operator op(L const& l, R const& r)  \
  87 {                                                                       \
  88     return object(l) op object(r);                                      \
  89 }
  90 BOOST_PYTHON_BINARY_OPERATOR(>)
  91 BOOST_PYTHON_BINARY_OPERATOR(>=)
  92 BOOST_PYTHON_BINARY_OPERATOR(<)
  93 BOOST_PYTHON_BINARY_OPERATOR(<=)
  94 BOOST_PYTHON_BINARY_OPERATOR(==)
  95 BOOST_PYTHON_BINARY_OPERATOR(!=)
  96 BOOST_PYTHON_BINARY_OPERATOR(+)
  97 BOOST_PYTHON_BINARY_OPERATOR(-)
  98 BOOST_PYTHON_BINARY_OPERATOR(*)
  99 BOOST_PYTHON_BINARY_OPERATOR(/)
 100 BOOST_PYTHON_BINARY_OPERATOR(%)
 101 BOOST_PYTHON_BINARY_OPERATOR(<<)
 102 BOOST_PYTHON_BINARY_OPERATOR(>>)
 103 BOOST_PYTHON_BINARY_OPERATOR(&)
 104 BOOST_PYTHON_BINARY_OPERATOR(^)
 105 BOOST_PYTHON_BINARY_OPERATOR(|)
 106 # undef BOOST_PYTHON_BINARY_OPERATOR
 107
 108
 109 # define BOOST_PYTHON_INPLACE_OPERATOR(op)                              \
 110 BOOST_PYTHON_DECL object& operator op(object& l, object const& r);      \
 111 template <class R>                                                      \
 112 object& operator op(object& l, R const& r)                              \
 113 {                                                                       \
 114     return l op object(r);                                              \
 115 }
 116 BOOST_PYTHON_INPLACE_OPERATOR(+=)
 117 BOOST_PYTHON_INPLACE_OPERATOR(-=)
 118 BOOST_PYTHON_INPLACE_OPERATOR(*=)
 119 BOOST_PYTHON_INPLACE_OPERATOR(/=)
 120 BOOST_PYTHON_INPLACE_OPERATOR(%=)
 121 BOOST_PYTHON_INPLACE_OPERATOR(<<=)
 122 BOOST_PYTHON_INPLACE_OPERATOR(>>=)
 123 BOOST_PYTHON_INPLACE_OPERATOR(&=)
 124 BOOST_PYTHON_INPLACE_OPERATOR(^=)
 125 BOOST_PYTHON_INPLACE_OPERATOR(|=)
 126 # undef BOOST_PYTHON_INPLACE_OPERATOR
 127
 128 }}} // namespace boost::python
 129
 130 #include <boost/iterator/detail/config_undef.hpp>
 131
 132 #endif // OBJECT_OPERATORS_DWA2002617_HPP