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

class template

std::greater_equal

template <class T> struct greater_equal;

Function object class for greater-than-or-equal-to comparison

Binary function object class whose call returns whether the its first argument compares greater than or equal to the second (as returned by operator >=).

Generically, function objects are instances of a class with member function operator() defined. This member function allows the object to be used with the same syntax as a function call.

It is defined with the same behavior as:

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template <class T> struct greater_equal : binary_function <T,T,bool> {
  bool operator() (const T& x, const T& y) const {return x>=y;}
};

template <class T> struct greater_equal {
  bool operator() (const T& x, const T& y) const {return x>=y;}
  typedef T first_argument_type;
  typedef T second_argument_type;
  typedef bool result_type;
};

Objects of this class can be used on standard algorithms such as sort, merge or lower_bound.

Template parameters

T: Type of the arguments to compare by the functional call.
The type shall support the operation (operator>=).

Member types member type definition notes first_argument_type T Type of the first argument in member operator() second_argument_type T Type of the second argument in member operator() result_type bool Type returned by member operator()
Member functions

bool operator() (const T& x, const T& y): Member function returning whether the first argument compares greater than or equal to the second (x>=y).

Example

// greater_equal example
#include <iostream>     // std::cout
#include <functional>   // std::greater_equal, std::bind2nd
#include <algorithm>    // std::count_if

int main () {
  int numbers[]={20,-30,10,-40,0};
  int cx = std::count_if (numbers, numbers+5, std::bind2nd(std::greater_equal<int>(),0));
  std::cout << "There are " << cx << " non-negative elements.\n";
  return 0;
}

Output:

There are 3 non-negative elements.