Deepcopy: Difference between revisions

Handled natively. Phix uses reference counting with copy-on-write semantics; the initial copy is fast even for huge complex and deeply nested structures (copying a single machine-word-sized reference and incrementing a single machine-word-sized reference count), and when a shared object (anything with a refcount>1) is modified, an internal clone of the minimum necessary levels occurs, with all the rest of the structure remaining shared (but obviously still properly protected in the same way).

<lang Phix>object a, b

b = a

b[3] = 4