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pure_virtual.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\python\pure_virtual.hpp
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// Copyright David Abrahams 2003. // 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 PURE_VIRTUAL_DWA2003810_HPP # define PURE_VIRTUAL_DWA2003810_HPP # include
# include
# include
# include
# include
namespace boost { namespace python { namespace detail { // // @group Helpers for pure_virtual_visitor. { // // Raises a Python RuntimeError reporting that a pure virtual // function was called. void BOOST_PYTHON_DECL pure_virtual_called(); // Replace the two front elements of S with T1 and T2 template
struct replace_front2 { // Metafunction forwarding seemed to confound vc6 typedef typename mpl::push_front< typename mpl::push_front< typename mpl::pop_front< typename mpl::pop_front< S >::type >::type , T2 >::type , T1 >::type type; }; // Given an MPL sequence representing a member function [object] // signature, returns a new MPL sequence whose return type is // replaced by void, and whose first argument is replaced by C&. template
typename replace_front2
::type error_signature(S BOOST_APPEND_EXPLICIT_TEMPLATE_TYPE(C)) { typedef typename replace_front2
::type r; return r(); } // // } // // // A def_visitor which defines a method as usual, then adds a // corresponding function which raises a "pure virtual called" // exception unless it's been overridden. // template
struct pure_virtual_visitor : def_visitor
> { pure_virtual_visitor(PointerToMemberFunction pmf) : m_pmf(pmf) {} private: friend class python::def_visitor_access; template
void visit(C_& c, char const* name, Options& options) const { // This should probably be a nicer error message BOOST_STATIC_ASSERT(!Options::has_default_implementation); // Add the virtual function dispatcher c.def( name , m_pmf , options.doc() , options.keywords() , options.policies() ); typedef BOOST_DEDUCED_TYPENAME C_::metadata::held_type held_type; // Add the default implementation which raises the exception c.def( name , make_function( detail::nullary_function_adaptor
(pure_virtual_called) , default_call_policies() , detail::error_signature
(detail::get_signature(m_pmf)) ) ); } private: // data members PointerToMemberFunction m_pmf; }; } // // Passed a pointer to member function, generates a def_visitor which // creates a method that only dispatches to Python if the function has // been overridden, either in C++ or in Python, raising a "pure // virtual called" exception otherwise. // template
detail::pure_virtual_visitor
pure_virtual(PointerToMemberFunction pmf) { return detail::pure_virtual_visitor
(pmf); } }} // namespace boost::python #endif // PURE_VIRTUAL_DWA2003810_HPP
pure_virtual.hpp
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