Re: [Boost-users] correct usage of bind (pls ignore last email)

Subject: Re: [Boost-users] correct usage of bind (pls ignore last email)
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-03-17 18:40:57

AMDG

Sandeep Gupta wrote:
> template<typename X, typename Y>
> std::pair<X, Y> buildPair(X x, Y y);
>
> int main()
> {
>   typedef boost::function<void (std::pair<int,int>)> FuncType1_t;
>   FuncType1_t ft1;
>
>   typedef boost::function<void(std::pair<int,int>)> FuncType2_t;
>   FuncType2_t ft2 =  bind(ft1, bind(buildPair<int,int>,_1,_2));
> }
>
> This fails. The problem however vanished if I replace the declaration
> "FuncType3 ft2..."  with
>   bind(ft1, bind(buildPair<int,int>,_1,_2))(3,5);
>
> So my question is what is correct type of  bind(ft1,
> bind(buildPair<int,int>,_1,_2));
>   

Since it is a function which takes two ints,
the correct type is

boost::function<void(int, int)>

In Christ,
Steven Watanabe