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opApply example isn't compliant with spec #372

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opApply example isn't compliant with spec #372

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27c6923
Make opApply example compliant with the spec
Inkrementator Oct 6, 2023
862a5dd
Make opApply example easier to copy/paste and run
Inkrementator Oct 6, 2023
e4a901c
opApply: Add example object for easier copy/paste
Inkrementator Oct 6, 2023
9ef3f59
Conciseness
Inkrementator Oct 6, 2023
db9442b
Style
Inkrementator Oct 6, 2023
7ebdb43
Style
Inkrementator Oct 6, 2023
e134cb0
Appropriate tags: scope + ref
Inkrementator Oct 6, 2023
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22 changes: 14 additions & 8 deletions gems/opdispatch-opapply.md
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Original file line number Diff line number Diff line change
Expand Up @@ -40,18 +40,24 @@ over such a type will call `opApply` with a special
delegate as a parameter:

class Tree {
int val;
Tree lhs;
Tree rhs;
int opApply(int delegate(Tree) dg) {
if (lhs && lhs.opApply(dg)) return 1;
if (dg(this)) return 1;
if (rhs && rhs.opApply(dg)) return 1;
return 0;
this(int val, Tree lhs = null, Tree rhs = null) {
this.val = val;
this.lhs = lhs;
this.rhs = rhs;
}
int opApply(scope int delegate(ref Tree) dg) {
if (int res = lhs ? lhs.opApply(dg) : 0) return res;
if (int res = rhs ? rhs.opApply(dg) : 0) return res;
return dg(this);
}
}
Tree tree = new Tree;
foreach(node; tree) {
...
Tree tree = new Tree(5,
new Tree(3, new Tree(190)), new Tree(6));
foreach (node; tree) {
node.val.writeln;
}

The compiler transforms the `foreach` body to a special
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