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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_functional_not_equal_to.htm below:

C++ Functional Not Equal To

It is a function object class for non-equality comparison and binary function object class whose call returns whether its two arguments compare not equal (as returned by operator operator!=).

Following is the declaration for std::not_equal_to.

template <class T> struct not_equal_to;

template <class T> struct not_equal_to;

T − It is a type of the arguments and return type of the functional call.

none

noexcep − It doesn't throw any exceptions.

In below example explains about std::not_equal_to.

#include <iostream>
#include <functional>
#include <algorithm>

int main () {
   int numbers[]={10,20,30,40,50};
   int* pt = std::adjacent_find (numbers, numbers+5, std::not_equal_to<int>()) +1;
   std::cout << " Different element is " << *pt << '\n';
   return 0;
}

Let us compile and run the above program, this will produce the following result −

 Different element is 20

functional.htm

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