Add a unwrap member function

[ptal]

What would be the difference between unwrap and get or operator*?

[viboes]

What get() does? Do you mean value()? unwrap takes in account the state of two nested expected.

Next follows the definition using a non-member function

  template <class T, class E>
  expected<E,T> unwrap(expected<E, expected<E,T> > ee) {
    if (ee) return *ee;
    return ee.get_unexpected();
  }
  template <class T, class E>
  expected<E,T> unwrap(expected<E,T> e) {
    return e;
  }

[ptal]

Ok, I think it makes sense, I'm adding this and redefined mbind in term of fmap.

[viboes]

I suggest to change the title of this issue to Add unwrap member function and make it an enhancement.

[viboes]

https://github.com/ptal/Boost.Expected/commit/56051bbc6e5ffa1a32946c550e85a5f69f900c1a

https://github.com/ptal/Boost.Expected/commit/a2407f89ecdd3b64482471bbc8d9c507980ee0f1