613 lines
18 KiB
Plaintext
613 lines
18 KiB
Plaintext
// Copyright David Abrahams 2002.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef CLASS_DWA200216_HPP
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# define CLASS_DWA200216_HPP
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# include <boost/python/detail/prefix.hpp>
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# include <boost/noncopyable.hpp>
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# include <boost/python/class_fwd.hpp>
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# include <boost/python/object/class.hpp>
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# include <boost/python/object.hpp>
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# include <boost/python/type_id.hpp>
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# include <boost/python/data_members.hpp>
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# include <boost/python/make_function.hpp>
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# include <boost/python/signature.hpp>
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# include <boost/python/init.hpp>
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# include <boost/python/args_fwd.hpp>
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# include <boost/python/object/class_metadata.hpp>
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# include <boost/python/object/pickle_support.hpp>
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# include <boost/python/object/add_to_namespace.hpp>
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# include <boost/python/detail/overloads_fwd.hpp>
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# include <boost/python/detail/operator_id.hpp>
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# include <boost/python/detail/def_helper.hpp>
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# include <boost/python/detail/force_instantiate.hpp>
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# include <boost/python/detail/unwrap_type_id.hpp>
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# include <boost/python/detail/unwrap_wrapper.hpp>
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# include <boost/type_traits/is_same.hpp>
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# include <boost/type_traits/is_member_function_pointer.hpp>
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# include <boost/type_traits/is_polymorphic.hpp>
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# include <boost/mpl/size.hpp>
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# include <boost/mpl/for_each.hpp>
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# include <boost/mpl/bool.hpp>
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# include <boost/mpl/not.hpp>
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# include <boost/detail/workaround.hpp>
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# if BOOST_WORKAROUND(__MWERKS__, <= 0x3004) \
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/* pro9 reintroduced the bug */ \
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|| (BOOST_WORKAROUND(__MWERKS__, > 0x3100) \
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&& BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
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# define BOOST_PYTHON_NO_MEMBER_POINTER_ORDERING 1
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# endif
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# ifdef BOOST_PYTHON_NO_MEMBER_POINTER_ORDERING
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# include <boost/mpl/and.hpp>
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# include <boost/type_traits/is_member_pointer.hpp>
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# endif
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namespace boost { namespace python {
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template <class DerivedVisitor> class def_visitor;
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enum no_init_t { no_init };
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namespace detail
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{
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// This function object is used with mpl::for_each to write the id
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// of the type a pointer to which is passed as its 2nd compile-time
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// argument. into the iterator pointed to by its runtime argument
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struct write_type_id
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{
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write_type_id(type_info**p) : p(p) {}
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// Here's the runtime behavior
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template <class T>
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void operator()(T*) const
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{
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*(*p)++ = type_id<T>();
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}
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type_info** p;
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};
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template <class T>
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struct is_data_member_pointer
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: mpl::and_<
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is_member_pointer<T>
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, mpl::not_<is_member_function_pointer<T> >
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>
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{};
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# ifdef BOOST_PYTHON_NO_MEMBER_POINTER_ORDERING
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# define BOOST_PYTHON_DATA_MEMBER_HELPER(D) , detail::is_data_member_pointer<D>()
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# define BOOST_PYTHON_YES_DATA_MEMBER , mpl::true_
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# define BOOST_PYTHON_NO_DATA_MEMBER , mpl::false_
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# elif defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
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# define BOOST_PYTHON_DATA_MEMBER_HELPER(D) , 0
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# define BOOST_PYTHON_YES_DATA_MEMBER , int
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# define BOOST_PYTHON_NO_DATA_MEMBER , ...
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# else
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# define BOOST_PYTHON_DATA_MEMBER_HELPER(D)
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# define BOOST_PYTHON_YES_DATA_MEMBER
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# define BOOST_PYTHON_NO_DATA_MEMBER
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# endif
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namespace error
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{
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//
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// A meta-assertion mechanism which prints nice error messages and
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// backtraces on lots of compilers. Usage:
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//
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// assertion<C>::failed
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//
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// where C is an MPL metafunction class
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//
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template <class C> struct assertion_failed { };
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template <class C> struct assertion_ok { typedef C failed; };
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template <class C>
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struct assertion
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: mpl::if_<C, assertion_ok<C>, assertion_failed<C> >::type
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{};
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//
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// Checks for validity of arguments used to define virtual
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// functions with default implementations.
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//
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template <class Default>
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void not_a_derived_class_member(Default) {}
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template <class T, class Fn>
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struct virtual_function_default
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{
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template <class Default>
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static void
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must_be_derived_class_member(Default const&)
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{
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// https://svn.boost.org/trac/boost/ticket/5803
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//typedef typename assertion<mpl::not_<is_same<Default,Fn> > >::failed test0;
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# if !BOOST_WORKAROUND(__MWERKS__, <= 0x2407)
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typedef typename assertion<is_polymorphic<T> >::failed test1 BOOST_ATTRIBUTE_UNUSED;
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# endif
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typedef typename assertion<is_member_function_pointer<Fn> >::failed test2 BOOST_ATTRIBUTE_UNUSED;
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not_a_derived_class_member<Default>(Fn());
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}
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};
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}
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}
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// This is the primary mechanism through which users will expose
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// C++ classes to Python.
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template <
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class W // class being wrapped
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, class X1 // = detail::not_specified
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, class X2 // = detail::not_specified
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, class X3 // = detail::not_specified
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>
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class class_ : public objects::class_base
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{
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public: // types
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typedef objects::class_base base;
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typedef class_<W,X1,X2,X3> self;
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typedef typename objects::class_metadata<W,X1,X2,X3> metadata;
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typedef W wrapped_type;
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private: // types
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// A helper class which will contain an array of id objects to be
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// passed to the base class constructor
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struct id_vector
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{
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typedef typename metadata::bases bases;
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id_vector()
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{
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// Stick the derived class id into the first element of the array
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ids[0] = detail::unwrap_type_id((W*)0, (W*)0);
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// Write the rest of the elements into succeeding positions.
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type_info* p = ids + 1;
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mpl::for_each(detail::write_type_id(&p), (bases*)0, (add_pointer<mpl::_>*)0);
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}
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BOOST_STATIC_CONSTANT(
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std::size_t, size = mpl::size<bases>::value + 1);
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type_info ids[size];
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};
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friend struct id_vector;
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public: // constructors
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// Construct with the class name, with or without docstring, and default __init__() function
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class_(char const* name, char const* doc = 0);
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// Construct with class name, no docstring, and an uncallable __init__ function
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class_(char const* name, no_init_t);
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// Construct with class name, docstring, and an uncallable __init__ function
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class_(char const* name, char const* doc, no_init_t);
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// Construct with class name and init<> function
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template <class DerivedT>
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inline class_(char const* name, init_base<DerivedT> const& i)
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: base(name, id_vector::size, id_vector().ids)
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{
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this->initialize(i);
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}
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// Construct with class name, docstring and init<> function
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template <class DerivedT>
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inline class_(char const* name, char const* doc, init_base<DerivedT> const& i)
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: base(name, id_vector::size, id_vector().ids, doc)
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{
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this->initialize(i);
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}
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public: // member functions
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// Generic visitation
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template <class Derived>
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self& def(def_visitor<Derived> const& visitor)
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{
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visitor.visit(*this);
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return *this;
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}
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// Wrap a member function or a non-member function which can take
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// a T, T cv&, or T cv* as its first parameter, a callable
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// python object, or a generic visitor.
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template <class F>
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self& def(char const* name, F f)
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{
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this->def_impl(
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detail::unwrap_wrapper((W*)0)
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, name, f, detail::def_helper<char const*>(0), &f);
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return *this;
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}
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template <class A1, class A2>
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self& def(char const* name, A1 a1, A2 const& a2)
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{
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this->def_maybe_overloads(name, a1, a2, &a2);
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return *this;
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}
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template <class Fn, class A1, class A2>
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self& def(char const* name, Fn fn, A1 const& a1, A2 const& a2)
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{
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// The arguments are definitely:
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// def(name, function, policy, doc_string)
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// def(name, function, doc_string, policy)
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this->def_impl(
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detail::unwrap_wrapper((W*)0)
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, name, fn
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, detail::def_helper<A1,A2>(a1,a2)
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, &fn);
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return *this;
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}
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template <class Fn, class A1, class A2, class A3>
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self& def(char const* name, Fn fn, A1 const& a1, A2 const& a2, A3 const& a3)
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{
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this->def_impl(
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detail::unwrap_wrapper((W*)0)
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, name, fn
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, detail::def_helper<A1,A2,A3>(a1,a2,a3)
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, &fn);
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return *this;
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}
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//
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// Data member access
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//
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template <class D>
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self& def_readonly(char const* name, D const& d, char const* doc=0)
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{
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return this->def_readonly_impl(name, d, doc BOOST_PYTHON_DATA_MEMBER_HELPER(D));
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}
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template <class D>
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self& def_readwrite(char const* name, D const& d, char const* doc=0)
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{
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return this->def_readwrite_impl(name, d, doc BOOST_PYTHON_DATA_MEMBER_HELPER(D));
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}
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template <class D>
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self& def_readonly(char const* name, D& d, char const* doc=0)
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{
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return this->def_readonly_impl(name, d, doc BOOST_PYTHON_DATA_MEMBER_HELPER(D));
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}
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template <class D>
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self& def_readwrite(char const* name, D& d, char const* doc=0)
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{
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return this->def_readwrite_impl(name, d, doc BOOST_PYTHON_DATA_MEMBER_HELPER(D));
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}
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// Property creation
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template <class Get>
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self& add_property(char const* name, Get fget, char const* docstr = 0)
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{
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base::add_property(name, this->make_getter(fget), docstr);
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return *this;
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}
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template <class Get, class Set>
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self& add_property(char const* name, Get fget, Set fset, char const* docstr = 0)
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{
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base::add_property(
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name, this->make_getter(fget), this->make_setter(fset), docstr);
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return *this;
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}
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template <class Get>
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self& add_static_property(char const* name, Get fget)
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{
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base::add_static_property(name, object(fget));
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return *this;
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}
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template <class Get, class Set>
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self& add_static_property(char const* name, Get fget, Set fset)
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{
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base::add_static_property(name, object(fget), object(fset));
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return *this;
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}
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template <class U>
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self& setattr(char const* name, U const& x)
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{
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this->base::setattr(name, object(x));
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return *this;
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}
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// Pickle support
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template <typename PickleSuiteType>
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self& def_pickle(PickleSuiteType const& x)
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{
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error_messages::must_be_derived_from_pickle_suite(x);
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detail::pickle_suite_finalize<PickleSuiteType>::register_(
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*this,
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&PickleSuiteType::getinitargs,
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&PickleSuiteType::getstate,
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&PickleSuiteType::setstate,
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PickleSuiteType::getstate_manages_dict());
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return *this;
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}
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self& enable_pickling()
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{
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this->base::enable_pickling_(false);
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return *this;
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}
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self& staticmethod(char const* name)
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{
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this->make_method_static(name);
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return *this;
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}
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private: // helper functions
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// Builds a method for this class around the given [member]
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// function pointer or object, appropriately adjusting the type of
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// the first signature argument so that if f is a member of a
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// (possibly not wrapped) base class of T, an lvalue argument of
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// type T will be required.
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//
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// @group PropertyHelpers {
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template <class F>
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object make_getter(F f)
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{
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typedef typename api::is_object_operators<F>::type is_obj_or_proxy;
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return this->make_fn_impl(
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detail::unwrap_wrapper((W*)0)
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, f, is_obj_or_proxy(), (char*)0, detail::is_data_member_pointer<F>()
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);
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}
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template <class F>
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object make_setter(F f)
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{
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typedef typename api::is_object_operators<F>::type is_obj_or_proxy;
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return this->make_fn_impl(
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detail::unwrap_wrapper((W*)0)
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, f, is_obj_or_proxy(), (int*)0, detail::is_data_member_pointer<F>()
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);
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}
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template <class T, class F>
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object make_fn_impl(T*, F const& f, mpl::false_, void*, mpl::false_)
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{
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return python::make_function(f, default_call_policies(), detail::get_signature(f, (T*)0));
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}
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template <class T, class D, class B>
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object make_fn_impl(T*, D B::*pm_, mpl::false_, char*, mpl::true_)
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{
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D T::*pm = pm_;
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return python::make_getter(pm);
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}
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template <class T, class D, class B>
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object make_fn_impl(T*, D B::*pm_, mpl::false_, int*, mpl::true_)
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{
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D T::*pm = pm_;
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return python::make_setter(pm);
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}
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template <class T, class F>
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object make_fn_impl(T*, F const& x, mpl::true_, void*, mpl::false_)
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{
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return x;
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}
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// }
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template <class D, class B>
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self& def_readonly_impl(
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char const* name, D B::*pm_, char const* doc BOOST_PYTHON_YES_DATA_MEMBER)
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{
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return this->add_property(name, pm_, doc);
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}
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template <class D, class B>
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self& def_readwrite_impl(
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char const* name, D B::*pm_, char const* doc BOOST_PYTHON_YES_DATA_MEMBER)
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{
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return this->add_property(name, pm_, pm_, doc);
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}
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template <class D>
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self& def_readonly_impl(
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char const* name, D& d, char const* BOOST_PYTHON_NO_DATA_MEMBER)
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{
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return this->add_static_property(name, python::make_getter(d));
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}
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template <class D>
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self& def_readwrite_impl(
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char const* name, D& d, char const* BOOST_PYTHON_NO_DATA_MEMBER)
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{
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return this->add_static_property(name, python::make_getter(d), python::make_setter(d));
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}
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template <class DefVisitor>
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inline void initialize(DefVisitor const& i)
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{
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metadata::register_(); // set up runtime metadata/conversions
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typedef typename metadata::holder holder;
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this->set_instance_size( objects::additional_instance_size<holder>::value );
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this->def(i);
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}
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inline void initialize(no_init_t)
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{
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metadata::register_(); // set up runtime metadata/conversions
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this->def_no_init();
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}
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//
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// These two overloads discriminate between def() as applied to a
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// generic visitor and everything else.
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//
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// @group def_impl {
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template <class T, class Helper, class LeafVisitor, class Visitor>
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inline void def_impl(
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T*
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, char const* name
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, LeafVisitor
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, Helper const& helper
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, def_visitor<Visitor> const* v
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)
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{
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v->visit(*this, name, helper);
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}
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template <class T, class Fn, class Helper>
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inline void def_impl(
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T*
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, char const* name
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, Fn fn
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, Helper const& helper
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, ...
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)
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{
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objects::add_to_namespace(
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*this
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, name
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, make_function(
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fn
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, helper.policies()
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, helper.keywords()
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, detail::get_signature(fn, (T*)0)
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)
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, helper.doc()
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);
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this->def_default(name, fn, helper, mpl::bool_<Helper::has_default_implementation>());
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}
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// }
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//
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// These two overloads handle the definition of default
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// implementation overloads for virtual functions. The second one
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// handles the case where no default implementation was specified.
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//
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// @group def_default {
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template <class Fn, class Helper>
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inline void def_default(
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char const* name
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, Fn
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, Helper const& helper
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, mpl::bool_<true>)
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{
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detail::error::virtual_function_default<W,Fn>::must_be_derived_class_member(
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helper.default_implementation());
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objects::add_to_namespace(
|
|
*this, name,
|
|
make_function(
|
|
helper.default_implementation(), helper.policies(), helper.keywords())
|
|
);
|
|
}
|
|
|
|
template <class Fn, class Helper>
|
|
inline void def_default(char const*, Fn, Helper const&, mpl::bool_<false>)
|
|
{ }
|
|
// }
|
|
|
|
//
|
|
// These two overloads discriminate between def() as applied to
|
|
// regular functions and def() as applied to the result of
|
|
// BOOST_PYTHON_FUNCTION_OVERLOADS(). The final argument is used to
|
|
// discriminate.
|
|
//
|
|
// @group def_maybe_overloads {
|
|
template <class OverloadsT, class SigT>
|
|
void def_maybe_overloads(
|
|
char const* name
|
|
, SigT sig
|
|
, OverloadsT const& overloads
|
|
, detail::overloads_base const*)
|
|
|
|
{
|
|
// convert sig to a type_list (see detail::get_signature in signature.hpp)
|
|
// before calling detail::define_with_defaults.
|
|
detail::define_with_defaults(
|
|
name, overloads, *this, detail::get_signature(sig));
|
|
}
|
|
|
|
template <class Fn, class A1>
|
|
void def_maybe_overloads(
|
|
char const* name
|
|
, Fn fn
|
|
, A1 const& a1
|
|
, ...)
|
|
{
|
|
this->def_impl(
|
|
detail::unwrap_wrapper((W*)0)
|
|
, name
|
|
, fn
|
|
, detail::def_helper<A1>(a1)
|
|
, &fn
|
|
);
|
|
|
|
}
|
|
// }
|
|
};
|
|
|
|
|
|
//
|
|
// implementations
|
|
//
|
|
|
|
template <class W, class X1, class X2, class X3>
|
|
inline class_<W,X1,X2,X3>::class_(char const* name, char const* doc)
|
|
: base(name, id_vector::size, id_vector().ids, doc)
|
|
{
|
|
this->initialize(init<>());
|
|
// select_holder::assert_default_constructible();
|
|
}
|
|
|
|
template <class W, class X1, class X2, class X3>
|
|
inline class_<W,X1,X2,X3>::class_(char const* name, no_init_t)
|
|
: base(name, id_vector::size, id_vector().ids)
|
|
{
|
|
this->initialize(no_init);
|
|
}
|
|
|
|
template <class W, class X1, class X2, class X3>
|
|
inline class_<W,X1,X2,X3>::class_(char const* name, char const* doc, no_init_t)
|
|
: base(name, id_vector::size, id_vector().ids, doc)
|
|
{
|
|
this->initialize(no_init);
|
|
}
|
|
|
|
}} // namespace boost::python
|
|
|
|
# undef BOOST_PYTHON_DATA_MEMBER_HELPER
|
|
# undef BOOST_PYTHON_YES_DATA_MEMBER
|
|
# undef BOOST_PYTHON_NO_DATA_MEMBER
|
|
# undef BOOST_PYTHON_NO_MEMBER_POINTER_ORDERING
|
|
|
|
#endif // CLASS_DWA200216_HPP
|