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Description
The conclusion of our last discussion on immutability versus mutability was that it is largely a psychological distinction:
- when an object is identified by its value, then it should be immutable: integers, floats, complexes, strings;
- when an object is a container, whose identity can remain the same while its contents change, then it should be mutable: arrays, linked list nodes, tree nodes.
To declare that a new concrete type is immutable, prefix its declaration with immutable:
immutable type Complex{T<:Real} <: Number
re::T
im::T
end
Alternately, only the immutable keyword could be used:
immutable Complex{T<:Real} <: Number
re::T
im::T
end
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