Deepcopy: Difference between revisions
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→{{header|Phix}}: added syntax colouring the hard way, phix/basics
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=={{header|Phix}}==
{{libheader|Phix/basics}}
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>
<span style="color: #004080;">object</span> <span style="color: #000000;">a<span style="color: #0000FF;">,</span> <span style="color: #000000;">b</span>
<span style="color: #000000;">a</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{<span style="color: #000000;">1<span style="color: #0000FF;">,<span style="color: #0000FF;">{<span style="color: #000000;">2<span style="color: #0000FF;">,<span style="color: #000000;">3<span style="color: #0000FF;">}<span style="color: #0000FF;">,<span style="color: #008000;">"four"<span style="color: #0000FF;">,<span style="color: #0000FF;">{<span style="color: #000000;">5.6<span style="color: #0000FF;">,<span style="color: #000000;">7<span style="color: #0000FF;">,<span style="color: #0000FF;">{<span style="color: #000000;">8.9<span style="color: #0000FF;">}<span style="color: #0000FF;">}<span style="color: #0000FF;">}</span>
<span style="color: #000000;">b</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">a</span>
<span style="color: #000000;">b<span style="color: #0000FF;">[<span style="color: #000000;">3<span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">4</span>
<span style="color: #0000FF;">?<span style="color: #000000;">a</span>
?b</lang>▼
<span style="color: #0000FF;">?<span style="color: #000000;">b
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Should you for some (probably misguided) reason really want it, a recursive clone function might look like this:
<!--<lang Phix>
<span style="color: #008080;">function</span> <span style="color: #000000;">deep_copy<span style="color: #0000FF;">(<span style="color: #004080;">object</span> <span style="color: #000000;">o<span style="color: #0000FF;">)</span>
<span style="color: #004080;">object</span> <span style="color: #000000;">res</span>
<span style="color: #008080;">if</span> <span style="color: #004080;">atom<span style="color: #0000FF;">(<span style="color: #000000;">o<span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">o</span>
<span style="color: #008080;">else</span>
<span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat<span style="color: #0000FF;">(<span style="color: #008000;">' '<span style="color: #0000FF;">,<span style="color: #7060A8;">length<span style="color: #0000FF;">(<span style="color: #000000;">o<span style="color: #0000FF;">)<span style="color: #0000FF;">)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i<span style="color: #0000FF;">=<span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length<span style="color: #0000FF;">(<span style="color: #000000;">o<span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
<span style="color: #000000;">res<span style="color: #0000FF;">[<span style="color: #000000;">i<span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">deep_copy<span style="color: #0000FF;">(<span style="color: #000000;">o<span style="color: #0000FF;">[<span style="color: #000000;">i<span style="color: #0000FF;">]<span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">res</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #004080;">object</span> <span style="color: #000000;">c</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">deep_copy<span style="color: #0000FF;">(<span style="color: #000000;">b<span style="color: #0000FF;">)</span>
?c</lang>▼
<span style="color: #0000FF;">?<span style="color: #000000;">c
Or you could just serialize and deserialize:
<!--<lang Phix>
<span style="color: #008080;">include</span> <span style="color: #000000;">builtins<span style="color: #0000FF;">\<span style="color: #000000;">serialize<span style="color: #0000FF;">.<span style="color: #000000;">e</span>
<span style="color: #004080;">object</span> <span style="color: #000000;">d</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">deserialize<span style="color: #0000FF;">(<span style="color: #000000;">serialize<span style="color: #0000FF;">(<span style="color: #000000;">a<span style="color: #0000FF;">)<span style="color: #0000FF;">)</span>
?d</lang>▼
<span style="color: #0000FF;">?<span style="color: #000000;">d
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