OCL is it allow to write constraint on an operation and attribute

问题

Imagine the following class Person

================
|    Person    |
|--------------|
|- name        |
|- age         |
|--------------|
|+ drinkWater()|
|+ drinkBeer() |
================

Using OCL, is it possible to set a constraint on the operation drinkBeer()? For instance allowing only Person >= 21 year old to drink beer?

回答1:

context Person::drinkBeer()
pre Adult: self.age >= 21

should probably do.

来源：https://stackoverflow.com/questions/43815870/ocl-is-it-allow-to-write-constraint-on-an-operation-and-attribute