Polymorphic copy: Difference between revisions
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}
}</lang>
=={{header|Julia}}==
To perform as required in the exercise, mutable structs must be used to keep the deepcopy
procedure from being optimized away as a mere reference to the first struct.
<lang julia>
abstract type Jewel end
mutable struct RoseQuartz <: Jewel
carats::Float64
quality::String
end
mutable struct Sapphire <: Jewel
color::String
carats::Float64
quality::String
end
color(j::RoseQuartz) = "rosepink"
color(j::Jewel) = "Use the loupe."
color(j::Sapphire) = j.color
function testtypecopy()
a = Sapphire("blue", 5.0, "good")
b = RoseQuartz(3.5, "excellent")
j::Jewel = deepcopy(b)
println("a is a Jewel? ", a isa Jewel)
println("b is a Jewel? ", a isa Jewel)
println("j is a Jewel? ", a isa Jewel)
println("a is a Sapphire? ", a isa Sapphire)
println("a is a RoseQuartz? ", a isa RoseQuartz)
println("b is a Sapphire? ", b isa Sapphire)
println("b is a RoseQuartz? ", b isa RoseQuartz)
println("j is a Sapphire? ", j isa Sapphire)
println("j is a RoseQuartz? ", j isa RoseQuartz)
println("The color of j is ", color(j), ".")
println("j is the same as b? ", j == b)
end
testtypecopy()
</lang>{{output}} <pre>
a is a Jewel? true
b is a Jewel? true
j is a Jewel? true
a is a Sapphire? true
a is a RoseQuartz? false
b is a Sapphire? false
b is a RoseQuartz? true
j is a Sapphire? false
j is a RoseQuartz? true
The color of j is rosepink.
j is the same as b? false
</pre>
=={{header|Kotlin}}==
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