mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-25 14:22:14 +03:00
125 lines
3.7 KiB
C++
Executable File
125 lines
3.7 KiB
C++
Executable File
// 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 <boost/python/def_visitor.hpp>
|
|
# include <boost/python/default_call_policies.hpp>
|
|
# include <boost/mpl/push_front.hpp>
|
|
# include <boost/mpl/pop_front.hpp>
|
|
|
|
# include <boost/python/detail/nullary_function_adaptor.hpp>
|
|
|
|
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 <class S, class T1, class T2>
|
|
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 <class C, class S>
|
|
typename replace_front2<S,void,C&>::type
|
|
error_signature(S)
|
|
{
|
|
typedef typename replace_front2<S,void,C&>::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 <class PointerToMemberFunction>
|
|
struct pure_virtual_visitor
|
|
: def_visitor<pure_virtual_visitor<PointerToMemberFunction> >
|
|
{
|
|
pure_virtual_visitor(PointerToMemberFunction pmf)
|
|
: m_pmf(pmf)
|
|
{}
|
|
|
|
private:
|
|
friend class python::def_visitor_access;
|
|
|
|
template <class C_, class Options>
|
|
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<void(*)()>(pure_virtual_called)
|
|
, default_call_policies()
|
|
, detail::error_signature<held_type>(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 <class PointerToMemberFunction>
|
|
detail::pure_virtual_visitor<PointerToMemberFunction>
|
|
pure_virtual(PointerToMemberFunction pmf)
|
|
{
|
|
return detail::pure_virtual_visitor<PointerToMemberFunction>(pmf);
|
|
}
|
|
|
|
}} // namespace boost::python
|
|
|
|
#endif // PURE_VIRTUAL_DWA2003810_HPP
|