While my googling on "immutable" and "const" search words using
site:digitalmars.com has not thrown up authoritative/definitive answers,
please accept my apologies for (re)asking this question that I feel
sure has been asked numerous time before on this ng.
Specifically, I wish to have class which has a member variable which
cannot be changed (and is guaranteed not to change) and this member
variable happens to be a reference type (i.e. it's a pointer in C++
parlance) and, further more, the instance of the class which that
variable refers to is to be deep immutable.
For instance, with
class Foo
{
}
class Bar
{
Foo foo;
}
consider instances of Foo to be in ROM and instances of Bar to be in RAM
and once a Bar instance is constructed, the member variable foo itself
is not allowed to be modified.
Thanks for answers,
Justin Johansson
