This is probably OO 101, but I'm puzzled by how references work in sets.
Here's a minimal example.
julia> type testtype v::Bool end
julia> t1 = testtype( true )
testtype(true)
julia> t2 = testtype( false )
testtype(false)
julia> tset = Set{testtype}({t1,t2})
Set{testtype}({testtype(true),testtype(false)})
julia> t1.v = false
false
julia> tset
Set{testtype}({testtype(false),testtype(false)})
julia> t1.v = true
true
julia> tset
Set{testtype}({testtype(true),testtype(false)})
So far so good, this all makes sense to me: tset contains references to t1
and t2, and when I make a change t1 it is reflected in tset accordingly.
But...
julia> t1 = testtype( false )
testtype(false)
julia> tset
Set{testtype}({testtype(true),testtype(false)})
I would have thought "t1 = testtype( false )" redefined the reference,
which would also be reflected in tset, but tset still points to the old
value.
In that case, what is the proper way to modify a single element of tset in
place? With a more complicated type it may be inconvenient to modify each
property of t1. In particular I may have a constant value of type testtype
that I'd like to substitute for t1.
