Multiple distinct objects: Difference between revisions

=={{header|Phix}}==

Phix uses shared reference counts with copy-on-write semantics. Creating n references to the same mutable object is in fact the norm,

but does not cause any of the issues implicitly feared in the task description. In fact, it is not possible to create shared references

such that when one is updated they all are, except by deliberately storing an index to another table that stores the objects, rather

than the object itself. Also, apart from low-level trickery and interfacing to shared libraries, there are no pointers to normal hll objects. Finally, sequences need not be homogeneous.

<lang Phix>sequence s = repeat("x",3*rand(3))

?s

s[rand(length(s))] = 5

?s

s[rand(length(s))] &= 'y'

?s

s[rand(length(s))] = s

?s</lang>

{{out}}

<pre>

{"x","x","x","x","x","x"}

{"x","x","x","x","x",5}

{"xy","x","x","x","x",5}

{"xy",{"xy","x","x","x","x",5},"x","x","x",5}

</pre>