Re: [Boost-users] [signals2] analysing the signature

Subject: Re: [Boost-users] [signals2] analysing the signature
From: Frank Mori Hess (fmhess_at_[hidden])
Date: 2010-02-08 10:46:43

On Monday 08 February 2010, Igor R wrote:
> int main()
> {
>
>   boost::signals2::signal<void (int)> onEvent;
>   typedef BOOST_TYPEOF(onEvent) OnEvent;
>   typedef OnEvent::first_argument_type first;
> }
>
> And it doesn't compile (MSVC9.0)
>
> Note that if I add 1 argument, it does compile:
> //...
> boost::signals2::signal<void (int, int)> onEvent;
> typedef OnEvent::first_argument_type first;

first_argument_type/second_argument_type only exist for 2 argument signals.  
1 argument signals just have argument_type.  IIRC, thats how stuff in the 
functors in the STL look.