correct usage of bind (pls ignore last email)

17 Mar 2009

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

template
std::pair buildPair(X x, Y y)
{
  std::pair apair(x,y);
  return apair;
}

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

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

  return 0;
}

This fails. The problem however vanished if I replace the declaration
"FuncType3 ft2..."  with
  bind(ft1, bind(buildPair,_1,_2))(3,5);

So my question is what is correct type of  bind(ft1,
bind(buildPair,_1,_2));

Thanks
sandeep

Sandeep Gupta

Steven Watanabe

Sandeep Gupta

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