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Editing: object_core.hpp

// 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 OBJECT_CORE_DWA2002615_HPP
# define OBJECT_CORE_DWA2002615_HPP

# define BOOST_PYTHON_OBJECT_HAS_IS_NONE // added 2010-03-15 by rwgk

# include <boost/python/detail/prefix.hpp>

# include <boost/type.hpp>

# include <boost/python/call.hpp>
# include <boost/python/handle_fwd.hpp>
# include <boost/python/errors.hpp>
# include <boost/python/refcount.hpp>
# include <boost/python/detail/preprocessor.hpp>
# include <boost/python/tag.hpp>
# include <boost/python/def_visitor.hpp>

# include <boost/python/detail/raw_pyobject.hpp>
# include <boost/python/detail/dependent.hpp>

# include <boost/python/object/forward.hpp>
# include <boost/python/object/add_to_namespace.hpp>

# include <boost/preprocessor/iterate.hpp>
# include <boost/preprocessor/debug/line.hpp>

# include <boost/python/detail/is_xxx.hpp>
# include <boost/python/detail/string_literal.hpp>
# include <boost/python/detail/def_helper_fwd.hpp>
# include <boost/python/detail/type_traits.hpp>

namespace boost { namespace python {

namespace detail
{
  class kwds_proxy; 
  class args_proxy; 
}

namespace converter
{
 template <class T> struct arg_to_python;
}

// Put this in an inner namespace so that the generalized operators won't take over
namespace api
{
  
// This file contains the definition of the object class and enough to
// construct/copy it, but not enough to do operations like
// attribute/item access or addition.

template <class Policies> class proxy;
 
 struct const_attribute_policies;
 struct attribute_policies;
 struct const_objattribute_policies;
 struct objattribute_policies;
 struct const_item_policies;
 struct item_policies;
 struct const_slice_policies;
 struct slice_policies;
 class slice_nil;

typedef proxy<const_attribute_policies> const_object_attribute;
 typedef proxy<attribute_policies> object_attribute;
 typedef proxy<const_objattribute_policies> const_object_objattribute;
 typedef proxy<objattribute_policies> object_objattribute;
 typedef proxy<const_item_policies> const_object_item;
 typedef proxy<item_policies> object_item;
 typedef proxy<const_slice_policies> const_object_slice;
 typedef proxy<slice_policies> object_slice;

//
  // is_proxy -- proxy type detection
  //
  BOOST_PYTHON_IS_XXX_DEF(proxy, boost::python::api::proxy, 1)

template <class T> struct object_initializer;
 
 class object;
 typedef PyObject* (object::*bool_type)() const;
 
 template <class U>
 class object_operators : public def_visitor
 {
 protected:
 typedef object const& object_cref;
 public:
 // function call
 //
 object operator()() const;

# define BOOST_PP_ITERATION_PARAMS_1 (3, (1, BOOST_PYTHON_MAX_ARITY, <boost/python/object_call.hpp>))
# include BOOST_PP_ITERATE()
 
 detail::args_proxy operator* () const; 
 object operator()(detail::args_proxy const &args) const; 
 object operator()(detail::args_proxy const &args, 
 detail::kwds_proxy const &kwds) const;

// truth value testing
      //
      operator bool_type() const;
      bool operator!() const; // needed for vc6

// Attribute access
      //
      const_object_attribute attr(char const*) const;
      object_attribute attr(char const*);
      const_object_objattribute attr(object const&) const;
      object_objattribute attr(object const&);

// Wrap 'in' operator (aka. __contains__)
 template <class T>
 object contains(T const& key) const;
 
 // item access
 //
 const_object_item operator[](object_cref) const;
 object_item operator[](object_cref);
 
 template <class T>
 const_object_item
 operator[](T const& key) const;
 
 template <class T>
 object_item
 operator[](T const& key);

// slicing
      //
      const_object_slice slice(object_cref, object_cref) const;
      object_slice slice(object_cref, object_cref);

const_object_slice slice(slice_nil, object_cref) const;
      object_slice slice(slice_nil, object_cref);
                             
      const_object_slice slice(object_cref, slice_nil) const;
      object_slice slice(object_cref, slice_nil);

const_object_slice slice(slice_nil, slice_nil) const;
      object_slice slice(slice_nil, slice_nil);

template <class T, class V>
 const_object_slice
 slice(T const& start, V const& end) const;
 
 template <class T, class V>
 object_slice
 slice(T const& start, V const& end);
 
 private: // def visitation for adding callable objects as class methods
 
 template <class ClassT, class DocStringT>
 void visit(ClassT& cl, char const* name, python::detail::def_helper<DocStringT> const& helper) const
 {
 // It's too late to specify anything other than docstrings if
 // the callable object is already wrapped.
 BOOST_STATIC_ASSERT(
 (detail::is_same<char const*,DocStringT>::value
 || detail::is_string_literal<DocStringT const>::value));
 
 objects::add_to_namespace(cl, name, this->derived_visitor(), helper.doc());
 }

friend class python::def_visitor_access;
 
 private:
 // there is a confirmed CWPro8 codegen bug here. We prevent the
 // early destruction of a temporary by binding a named object
 // instead.
# if __MWERKS__ < 0x3000 || __MWERKS__ > 0x3003
 typedef object const& object_cref2;
# else
 typedef object const object_cref2;
# endif
 };

// VC6 and VC7 require this base class in order to generate the
 // correct copy constructor for object. We can't define it there
 // explicitly or it will complain of ambiguity.
 struct object_base : object_operators<object>
 {
 // copy constructor without NULL checking, for efficiency. 
 inline object_base(object_base const&);
 inline object_base(PyObject* ptr);
 
 inline object_base& operator=(object_base const& rhs);
 inline ~object_base();
 
 // Underlying object access -- returns a borrowed reference
 inline PyObject* ptr() const;

inline bool is_none() const;

private:
      PyObject* m_ptr;
  };

template <class T, class U>
 struct is_derived
 : boost::python::detail::is_convertible<
 typename detail::remove_reference<T>::type*
 , U const*
 >
 {};

template <class T>
 typename objects::unforward_cref<T>::type do_unforward_cref(T const& x)
 {
 return x;
 }

class object;
 
 template <class T>
 PyObject* object_base_initializer(T const& x)
 {
 typedef typename is_derived<
 BOOST_DEDUCED_TYPENAME objects::unforward_cref<T>::type
 , object
 >::type is_obj;

return object_initializer<
 BOOST_DEDUCED_TYPENAME unwrap_reference<T>::type
 >::get(
 x
 , is_obj()
 );
 }
 
 class object : public object_base
 {
 public:
 // default constructor creates a None object
 object();
 
 // explicit conversion from any C++ object to Python
 template <class T>
 explicit object(T const& x)
 : object_base(object_base_initializer(x))
 {
 }

// Throw error_already_set() if the handle is null.
 BOOST_PYTHON_DECL explicit object(handle<> const&);
 private:
 
 public: // implementation detail -- for internal use only
 explicit object(detail::borrowed_reference);
 explicit object(detail::new_reference);
 explicit object(detail::new_non_null_reference);
 };

// Macros for forwarding constructors in classes derived from
  // object. Derived classes will usually want these as an
  // implementation detail
# define BOOST_PYTHON_FORWARD_OBJECT_CONSTRUCTORS(derived, base)               \
    inline explicit derived(::boost::python::detail::borrowed_reference p)     \
        : base(p) {}                                                           \
    inline explicit derived(::boost::python::detail::new_reference p)          \
        : base(p) {}                                                           \
    inline explicit derived(::boost::python::detail::new_non_null_reference p) \
        : base(p) {}

//
 // object_initializer -- get the handle to construct the object with,
 // based on whether T is a proxy or derived from object
 //
 template <bool is_proxy = false, bool is_object_manager = false>
 struct object_initializer_impl
 {
 static PyObject*
 get(object const& x, detail::true_)
 {
 return python::incref(x.ptr());
 }
 
 template <class T>
 static PyObject*
 get(T const& x, detail::false_)
 {
 return python::incref(converter::arg_to_python<T>(x).get());
 }
 };
 
 template <>
 struct object_initializer_impl<true, false>
 {
 template <class Policies>
 static PyObject* 
 get(proxy<Policies> const& x, detail::false_)
 {
 return python::incref(x.operator object().ptr());
 }
 };

template <>
 struct object_initializer_impl<false, true>
 {
 template <class T, class U>
 static PyObject*
 get(T const& x, U)
 {
 return python::incref(get_managed_object(x, boost::python::tag));
 }
 };

template <>
 struct object_initializer_impl<true, true>
 {}; // empty implementation should cause an error

template <class T>
 struct object_initializer : object_initializer_impl<
 is_proxy<T>::value
 , converter::is_object_manager<T>::value
 >
 {};

}
using api::object;
template <class T> struct extract;

//
// implementation
//

namespace detail 
{

class call_proxy 
{ 
public: 
 call_proxy(object target) : m_target(target) {} 
 operator object() const { return m_target;} 
 
 private: 
 object m_target; 
}; 
 
class kwds_proxy : public call_proxy 
{ 
public: 
 kwds_proxy(object o = object()) : call_proxy(o) {} 
}; 
class args_proxy : public call_proxy 
{ 
public: 
 args_proxy(object o) : call_proxy(o) {} 
 kwds_proxy operator* () const { return kwds_proxy(*this);} 
}; 
} 
 
template <typename U> 
detail::args_proxy api::object_operators::operator* () const 
{ 
 object_cref2 x = *static_cast(this); 
 return boost::python::detail::args_proxy(x); 
} 
 
template <typename U> 
object api::object_operators::operator()(detail::args_proxy const &args) const 
{ 
 U const& self = *static_cast(this); 
 PyObject *result = PyObject_Call(get_managed_object(self, boost::python::tag), 
 args.operator object().ptr(), 
 0); 
 return object(boost::python::detail::new_reference(result)); 
 
} 
 
template <typename U> 
object api::object_operators::operator()(detail::args_proxy const &args, 
 detail::kwds_proxy const &kwds) const 
{ 
 U const& self = *static_cast(this); 
 PyObject *result = PyObject_Call(get_managed_object(self, boost::python::tag), 
 args.operator object().ptr(), 
 kwds.operator object().ptr()); 
 return object(boost::python::detail::new_reference(result)); 
 
}

template <typename U>
template <class T>
object api::object_operators::contains(T const& key) const
{
 return this->attr("__contains__")(object(key));
}

inline object::object()
    : object_base(python::incref(Py_None))
{}

// copy constructor without NULL checking, for efficiency
inline api::object_base::object_base(object_base const& rhs)
    : m_ptr(python::incref(rhs.m_ptr))
{}

inline api::object_base::object_base(PyObject* p)
    : m_ptr(p)
{}

inline api::object_base& api::object_base::operator=(api::object_base const& rhs)
{
    Py_INCREF(rhs.m_ptr);
    Py_DECREF(this->m_ptr);
    this->m_ptr = rhs.m_ptr;
    return *this;
}

inline api::object_base::~object_base()
{
    assert( Py_REFCNT(m_ptr) > 0 );
    Py_DECREF(m_ptr);
}

inline object::object(detail::borrowed_reference p)
    : object_base(python::incref((PyObject*)p))
{}

inline object::object(detail::new_reference p)
    : object_base(expect_non_null((PyObject*)p))
{}

inline object::object(detail::new_non_null_reference p)
    : object_base((PyObject*)p)
{}

inline PyObject* api::object_base::ptr() const
{
    return m_ptr;
}

inline bool api::object_base::is_none() const
{
    return (m_ptr == Py_None);
}

//
// Converter specialization implementations
//
namespace converter
{
 template <class T> struct object_manager_traits;
 
 template <>
 struct object_manager_traits<object>
 {
 BOOST_STATIC_CONSTANT(bool, is_specialized = true);
 static bool check(PyObject*) { return true; }
 
 static python::detail::new_non_null_reference adopt(PyObject* x)
 {
 return python::detail::new_non_null_reference(x);
 }
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
 static PyTypeObject const *get_pytype() {return 0;}
#endif
 };
}

inline PyObject* get_managed_object(object const& x, tag_t)
{
    return x.ptr();
}

}} // namespace boost::python

# include <boost/python/slice_nil.hpp>

#endif // OBJECT_CORE_DWA2002615_HPP

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