Използване на контейнер при обвързване на шаблонна функция за слот за сигнал

Опитвам се да обвържа шаблонна функция по време на сигнализиране. Въпреки това, когато използвам контейнер във функцията на слота, получавам грешка на компилатора "отрицателен индекс". Използвам Visual Studio 2008. Благодаря.

Код:

class My
{
private:
    boost::signals2::signal<void (int)> sig;

public:
    template < typename F, typename T, typename A1 >
    void proxy( F f, T t, A1 a1 )
    {
        boost::bind( f, t, a1 );    // this gets messaged elsewhere
    }

    int foo( int i )
    {
        return i-1;
    }

    int bar( int i )
    {
        return i+1;
    }

    template < typename F, typename T, typename A1 >
    boost::signals2::connection connect( F f, T t, A1 a1 )
    {
        return sig.connect( boost::bind( &My::proxy< F, T, A1 >, t, f, t, a1 ) );
    }

    void main()
    {
        boost::signals2::connection c1 = connect( &My::foo, this, 11 );     // ok
        boost::signals2::connection c2 = connect( &My::bar, this, _1 );     // negative subscript
    }
};

грешка:

boost/bind/arg.hpp(37) : error C2118: negative subscript
boost/bind/bind.hpp(450) : see reference to function template instantiation 'boost::arg<I>::arg<A1>(const T &)' being compiled
with
[
    I=1,
    A1=int,
    T=int
]
boost/bind/bind_template.hpp(32) : see reference to function template instantiation 'void boost::_bi::list4<A1,A2,A3,A4>::operator ()<F,boost::_bi::list1<int &>>(boost::_bi::type<T>,F &,A &,int)' being compiled
with
[
    A1=boost::_bi::value<My *>,
    A2=boost::_bi::value<int (__thiscall My::* )(int)>,
    A3=boost::_bi::value<My *>,
    A4=boost::arg<1>,
    F=boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,
    T=void,
    A=boost::_bi::list1<int &>
]
boost/function/function_template.hpp(153) : see reference to function template instantiation 'void boost::_bi::bind_t<R,F,L>::operator ()<T0>(A1 &)' being compiled
with
[
    R=void,
    F=boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,
    L=boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>,
    T0=int,
    A1=int
]
boost/function/function_template.hpp(147) : while compiling class template member function 'void boost::detail::function::void_function_obj_invoker1<FunctionObj,R,T0>::invoke(boost::detail::function::function_buffer &,T0)'
with
[
    FunctionObj=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>,
    R=void,
    T0=int
]
boost/function/function_template.hpp(913) : see reference to class template instantiation 'boost::detail::function::void_function_obj_invoker1<FunctionObj,R,T0>' being compiled
with
[
    FunctionObj=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>,
    R=void,
    T0=int
]
boost/function/function_template.hpp(722) : see reference to function template instantiation 'void boost::function1<R,T0>::assign_to<Functor>(Functor)' being compiled
with
[
    R=void,
    T0=int,
    Functor=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>
]
boost/function/function_template.hpp(1065) : see reference to function template instantiation 'boost::function1<R,T0>::function1<F>(Functor,int)' being compiled
with
[
    R=void,
    T0=int,
    F=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>,
    Functor=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>
]
boost/function/function_template.hpp(1105) : see reference to function template instantiation 'boost::function<Signature>::function<F>(Functor,int)' being compiled
with
[
    Signature=void (int),
    F=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>,
    Functor=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>
]
boost/signals2/detail/slot_template.hpp(137) : see reference to function template instantiation 'boost::function<Signature> &boost::function<Signature>::operator =<F>(Functor)' being compiled
with
[
    Signature=void (int),
    F=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>,
    Functor=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>
]
boost/signals2/detail/slot_template.hpp(81) : see reference to function template instantiation 'void boost::signals2::slot1<R,T1,SlotFunction>::init_slot_function<F>(const F &)' being compiled
with
[
    R=void,
    T1=int,
    SlotFunction=boost::function<void (int)>,
    F=boost::_bi::bind_t<void,boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>>
]
test.cpp(179) : see reference to function template instantiation 'boost::signals2::slot1<R,T1,SlotFunction>::slot1<boost::_bi::bind_t<R,F,L>>(const boost::_bi::bind_t<R,F,L> &)' being compiled
with
[
    R=void,
    T1=int,
    SlotFunction=boost::function<void (int)>,
    F=boost::_mfi::mf3<void,My,int (__thiscall My::* )(int),My *,boost::arg<1>>,
    L=boost::_bi::list4<boost::_bi::value<My *>,boost::_bi::value<int (__thiscall My::* )(int)>,boost::_bi::value<My *>,boost::arg<1>>
]
test.cpp(196) : see reference to function template instantiation 'boost::signals2::connection My::connect<int(__thiscall My::* )(int),My*,boost::arg<I>>(F,T,A1)' being compiled
with
[
    I=1,
    F=int (__thiscall My::* )(int),
    T=My *,
    A1=boost::arg<1>
]

c++ boost placeholder bind signals
person user1005752    schedule 28.10.2011    source източник

Отговори (1)


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Вероятно печатна грешка? Членската функция &My::proxy< F, T, A1 > във въпроса приема самия тип на контейнера _1 вместо действителния параметър int.
Така че в този случай промяната на &My::proxy< F, T, A1 > на &My::proxy< F, T, int > ще разреши грешката.
Ето тест на ideone.

person Ise Wisteria    schedule 28.10.2011
comment
Наистина беше печатна грешка... хаха. Не осъзнавах, че това е правилният начин за предаване на контейнера, въпреки че сега разбирам, че трябва по някакъв начин да уведомя компилатора какъв тип представлява контейнерът. Благодаря! - person user1005752; 28.10.2011