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Subject: [Boost-users] correct usage of bind (pls ignore last email)
From: Sandeep Gupta (gupta.sandeep_at_[hidden])
Date: 2009-03-17 18:22:20

 The code below tries to chain function ft1 (argument is a pair) with
function buildPair (returns a pair).

template<typename X, typename Y>
std::pair<X, Y> buildPair(X x, Y y)
  std::pair<X,Y> apair(x,y);
  return apair;

int main()
  typedef boost::function<void (std::pair<int,int>)> FuncType1_t;
  std::vector<std::pair<int,int> > myvec;
  FuncType1_t ft1 = bind(&std::vector<std::pair<int,int> >
::push_back, &myvec, _1);

  typedef boost::function<void(std::pair<int,int>)> FuncType2_t;
  FuncType2_t ft2 = bind(ft1, bind(buildPair<int,int>,_1,_2));
               //compile fails

  return 0;

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,


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