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Update partially initialized values in drop documentation. #648

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Merged
merged 2 commits into from
Aug 7, 2019
Merged

Update partially initialized values in drop documentation. #648

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663b0fb
Update partially initialized values in drop documentation.
ehuss Aug 6, 2019
a5b0281
Try a more explicit example for partial move destructor.
ehuss Aug 7, 2019
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11 changes: 8 additions & 3 deletions src/destructors.md
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Original file line number Diff line number Diff line change
Expand Up @@ -63,10 +63,15 @@ loop {
moved = ShowOnDrop("Drops when moved");
// drops now, but is then uninitialized
moved;

// Uninitialized does not drop.
let uninitialized: ShowOnDrop;
// Only first element drops
let mut partially_initialized: (ShowOnDrop, ShowOnDrop);
partially_initialized.0 = ShowOnDrop("Partial tuple first");

// After a partial move, only the remaining fields are dropped.
let mut partial_move = (ShowOnDrop("first"), ShowOnDrop("forgotten"));
// Perform a partial move, leaving only `partial_move.0` initialized.
core::mem::forget(partial_move.1);
// When partial_move's scope ends, only the first field is dropped.
}
```

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