Hooks

Outcome provides multiple methods for user code to intercept various lifecycle events which occur. The deepest method is simply to inherit from basic_result or basic_outcome, and override member functions, for which you will need to study the source code as that form of customisation is out of scope for this tutorial. Another option is to supply a custom NoValuePolicy (see preceding section). From Outcome v2.2 onwards, intercepting construction, copies and moves requires a custom NoValuePolicy. »