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Showing content from https://cplusplus.com/reference/functional/binder2nd/ below:

class template

<functional>

template <class Operation> class binder2nd;

Generate function object class with 2nd parameter bound

Generates an unary function object class from the binary object class

by binding its second parameter to a fixed value.

binder2nd is generally used as a type. The function bind2nd (also defined in header <functional>) can be used to directly construct an object of this type.

binder2nd is constructed using a binary function object as argument. A copy of this object is used by its member operator() to generate a result from its parameter and the fixed value set on construction.

This class is derived from unary_function and is typically defined as:

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template <class Operation> class binder2nd
  : public unary_function <typename Operation::first_argument_type,
                           typename Operation::result_type>
{
protected:
  Operation op;
  typename Operation::second_argument_type value;
public:
  binder2nd ( const Operation& x,
              const typename Operation::second_argument_type& y) : op (x), value(y) {}
  typename Operation::result_type
    operator() (const typename Operation::first_argument_type& x) const
    { return op(x,value); }
};

class is specifically designed to bind function objects (

) derived from

(it requires member

and

).

constructor

Constructs an unary function object class from a binary function object by binding its second argument to a value.

operator()

Member function taking a single parameter and returning the result of calling the binary function object used at construction with its second argument bound to a specific value.

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// binder2nd example
#include <iostream>
#include <functional>
#include <algorithm>
using namespace std;

int main () {
  binder2nd < less<int> > IsNegative (less<int>(),0);
  int numbers[] = {10,-20,-30,40,-50};
  int cx;
  cx = count_if (numbers,numbers+5,IsNegative);
  cout << "There are " << cx << " negative elements.\n";
  return 0;
}

Output:

There are 3 negative elements.

bind2nd

Return function object with second parameter bound (function template)

binder1st

Generate function object class with 1st parameter bound (class template)

unary_function

Unary function object base class (class template)

binary_function

Binary function object base class (class template)

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