class template

std::greater_equal

<functional>
template <class T> struct greater_equal;
Function object class for greater-than-or-equal-to comparison
This class defines function objects for the "greater than or equal to" comparison operation (>=).

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 regular function call, and therefore it can be used in templates instead of a pointer to a function.

greater_equal has its operator() member defined such that it returns true if its first argument compares greater than or equal to the second one using operator>=, and false otherwise.

This class is derived from binary_function and is defined 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;}
};


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

Members

bool operator() (const T& x, const T& y)
Member function returning the result of the comparison x>=y.

Example

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

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


Output:

There are 3 non-negative elements.

See also