binary_function Program in C++

This C++ program illustrates binary function object base. The Compare inherits from the binary_function object base defined in functional library. The numbers taken from input are passed to the function object and a boolean result is returned. If the result is true, the numbers are equal otherwise they are unequal.

Here is the source code of the C++ program illustrates unary function object base. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C++ Program to illustrate binary function objects bases 
  3.  */
  4. #include <iostream>
  5. #include <functional>
  6. #include <algorithm>
  7.  
  8. struct Compare : public std::binary_function<int, int, bool> {
  9.     bool operator() (int a, int b)
  10.     {
  11.         return (a == b);
  12.     }
  13. };
  14.  
  15. int main()
  16. {
  17.     Compare compare;
  18.     Compare::first_argument_type a;
  19.     Compare::first_argument_type b;
  20.     Compare::result_type r;
  21.  
  22.     std::cout << "Enter a = ";
  23.     std::cin  >> a;
  24.     std::cout << "Enter b = ";
  25.     std::cin  >> b;
  26.     r = compare(a, b);
  27.     std::cout << "Numbers " << a << " and " << b;
  28.     if(r == true)
  29.         std::cout << " are equal.\n";
  30.     else
  31.         std::cout << " are unequal.\n";
  32. }

$ a.out
Enter a = 10
Enter b = 20
Numbers 10 and 20 are unequal.
$ a.out
Enter a = 10
Enter b = 10
Numbers 10 and 10 are equal.

Sanfoundry Global Education & Learning Series – 1000 C++ Programs.

advertisement
If you wish to look at all C++ Programming examples, go to C++ Programs.

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
I’m Manish - Founder and CTO at Sanfoundry. I’ve been working in tech for over 25 years, with deep focus on Linux kernel, SAN technologies, Advanced C, Full Stack and Scalable website designs.

You can connect with me on LinkedIn, watch my Youtube Masterclasses, or join my Telegram tech discussions.

If you’re in your 40s–60s and exploring new directions in your career, I also offer mentoring. Learn more here.