You probably know that datatypes as `std::string` have some functions in it.
For example `std::string.substr()`.
I want to know, is there a way that i can add more funcionts to those types?
For example:

```
int a = 42;
a.isLife(); // a function that returns true if a is 42

```

But `isLife()` doesn't exist right?
Is there a way i can add it?