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

It's been implemented in C++03 for a long time. You can find it in Boost as boost::optional. boost::optional offers a simple if (value) interface.