I am trying to bind a template function during signaling. However, when I use a placeholder in the slot function, I get a "negative subscript" compiler error. I am using Visual Studio 2008. Thanks.
法典:
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
}
};
错误:
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>
]