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.

```
/*
```

 * C++ Program to illustrate binary function objects bases

```
 */
```
```
#include <iostream>
```
```
#include <functional>
```
```
#include <algorithm>
```
```
 
```

struct Compare : public std::binary_function<int, int, bool> {

```
    bool operator() (int a, int b)
```
```
    {
```
```
        return (a == b);
```
```
    }
```
```
};
```
```
 
```
```
int main()
```
```
{
```
```
    Compare compare;
```
```
    Compare::first_argument_type a;
```
```
    Compare::first_argument_type b;
```
```
    Compare::result_type r;
```
```
 
```
```
    std::cout << "Enter a = ";
```
```
    std::cin  >> a;
```
```
    std::cout << "Enter b = ";
```
```
    std::cin  >> b;
```
```
    r = compare(a, b);
```

    std::cout << "Numbers " << a << " and " << b;

```
    if(r == true)
```
```
        std::cout << " are equal.\n";
```
```
    else
```
```
        std::cout << " are unequal.\n";
```
```
}
```

$ 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.

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