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Which programming languages other than C++ support the concept of a constant class method? That is, what languages allow the programmer to constrain a method in such a way that it is guaranteed not to change the state of an object to which the method is applied?
Please provide examples or references in your answer.
Haskell, since it’s purely functional.
Actually, every value/method is constant in Haskell even though mutable state/IO can be modelled through a mathematical construct called monad.