Haskell style “Maybe” type & *chaining* in C++11

Question

I repeatedly find myself requiring Haskell style Maybe (especially Maybe chaining) in my project at work. E.g. withdrawal request from customer and we are give

Answer 1

As a recovering template-aholic, I feel it my duty to point out the simple non-template exception-based solution for the given example.

Adjust the code to throw an exception instead of returning Maybe/Optional, and the code becomes...

try
{
  print(getBalance(getCheckingAccount(getCustomer(customers, "12346"))));
}
catch(my_error_t) 
{}

That's not to say Maybe/Optional monads are never useful in C++, but for many cases exceptions will get things done in a much more idiomatic and easily understood manner.