90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
#pragma once
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#include <fc/function.hpp>
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#include <fc/future.hpp>
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namespace fc {
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namespace detail {
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struct identity_member {
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// TODO: enumerate all method patterns
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template<typename R, typename C, typename P>
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static fc::function<R()> functor( P&& p, R (C::*mem_func)() ) {
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return [=](){ return (p->*mem_func)(); };
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}
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template<typename R, typename C, typename A1, typename P>
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static fc::function<R(A1)> functor( P&& p, R (C::*mem_func)(A1) ) {
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return [=](A1 a1){ return (p->*mem_func)(a1); };
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}
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};
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template< typename Interface, typename Transform = detail::identity_member >
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struct vtable{};
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template<typename ThisPtr>
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struct vtable_visitor {
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template<typename U>
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vtable_visitor( U&& u ):_this( fc::forward<U>(u) ){}
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template<typename Function, typename MemberPtr>
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void operator()( const char* name, Function& memb, MemberPtr m )const {
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memb = identity_member::functor( _this, m );
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}
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ThisPtr _this;
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};
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} // namespace detail
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template<typename Interface, typename Transform = detail::identity_member >
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class ptr {
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public:
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typedef detail::vtable<Interface,Transform> vtable_type;
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ptr(){}
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template<typename InterfaceType>
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ptr( InterfaceType* p )
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:_vtable( new vtable_type() ) {
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_vtable->template visit<InterfaceType>( detail::vtable_visitor<InterfaceType*>(p) );
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}
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template<typename InterfaceType>
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ptr( const fc::shared_ptr<InterfaceType>& p )
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:_vtable( new vtable_type() ),_self(p){
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_vtable->template visit<InterfaceType>( detail::vtable_visitor<InterfaceType*>(p.get()) );
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}
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vtable_type& operator*() { return *_vtable; }
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const vtable_type& operator*()const { return *_vtable; }
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vtable_type* operator->() { return _vtable.get(); }
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const vtable_type* operator->()const { return _vtable.get(); }
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protected:
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fc::shared_ptr< vtable_type > _vtable;
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fc::shared_ptr< fc::retainable > _self;
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};
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}
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#include <boost/preprocessor/seq/for_each.hpp>
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#include <boost/preprocessor/stringize.hpp>
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#define FC_STUB_VTABLE_DEFINE_MEMBER( r, data, elem ) \
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decltype(Transform::functor( (data*)nullptr, &data::elem)) elem;
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#define FC_STUB_VTABLE_DEFINE_VISIT( r, data, elem ) \
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v( BOOST_PP_STRINGIZE(elem), elem, &T::elem ); \
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#define FC_STUB( CLASS, METHODS ) \
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namespace fc { namespace detail { \
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template<typename Transform> \
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struct vtable<test,Transform> : public fc::retainable { \
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BOOST_PP_SEQ_FOR_EACH( FC_STUB_VTABLE_DEFINE_MEMBER, CLASS, METHODS ) \
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template<typename T, typename Visitor> \
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void visit( Visitor&& v ) { \
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BOOST_PP_SEQ_FOR_EACH( FC_STUB_VTABLE_DEFINE_VISIT, CLASS, METHODS ) \
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} \
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}; \
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} }
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//#undef FC_STUB_VTABLE_DEFINE_MEMBER
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//#undef FC_STUB_VTABLE_DEFINE_VISIT
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