std::bind2nd is a binder to call a binary function with the value bound as second argument. If the first argument needs to be bound, use std::bind1st instead.

The distinction between std::bind1st and std::bind2nd gets clear in division:

If on all elements, an element called x, you want to perform 'x / 2.0', use std::bind2nd on the 2.0. This is demonstrated in the function Halve, which is shown below in the example
If on all elements, an element called x, you want to perform '1.0 / x', use std::bind1st one the 1.0. This is demonstrated in the function Reciprocal


#include <algorithm>

#include <numeric>

#include <vector>



//From http://www.richelbilderbeek.nl/CppHalve.htm

void Halve (std::vector<double>& v)

{

  std::transform(

    v.begin(),v.end(),v.begin(),

    std::bind2nd(std::divides<double>(),2.0));

}

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(C++) std::bind2nd