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Do not show trait vtables as located in the heap in memory diagram (#1882)

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This diagram is misleading and I often explain that the character data
of string literals resides in the executable's static data, with vtables
working the same.
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Frances Wingerter 2024-03-06 21:22:16 +00:00 committed by GitHub
parent 976f6f6f24
commit 42f6e1186e
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1 changed files with 24 additions and 24 deletions
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48
src/smart-pointers/trait-objects.md
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@ -48,30 +48,30 @@ Memory layout after allocating `pets`:
Stack Heap
.- - - - - - - - - - - - - -. .- - - - - - - - - - - - - - - - - - - - - - -.
: : : :
: pets : : +----+----+----+----+ :
: +-----------+-------+ : : +-----+-----+ .->| F | i | d | o | :
: | ptr | o---+---+-----+-->| o o | o o | | +----+----+----+----+ :
: | len | 2 | : : +-|-|-+-|-|-+ `---------. :
: | capacity | 2 | : : | | | | data | :
: +-----------+-------+ : : | | | | +-------+--|-------+ :
: : : | | | '-->| name | o, 4, 4 | :
: : : | | | | age | 5 | :
`- - - - - - - - - - - - - -' : | | | +-------+----------+ :
: | | | :
: | | | vtable :
: | | | +----------------------+ :
: | | '---->| "<Dog as Pet>::talk" | :
: | | +----------------------+ :
: | | :
: | | data :
: | | +-------+-------+ :
: | '-->| lives | 9 | :
: | +-------+-------+ :
: | :
: | vtable :
: | +----------------------+ :
: '---->| "<Cat as Pet>::talk" | :
: +----------------------+ :
: "pets: Vec<dyn Pet>" : : "data: Cat" +----+----+----+----+ :
: +-----------+-------+ : : +-------+-------+ | F | i | d | o | :
: | ptr | o---+---+--. : | lives | 9 | +----+----+----+----+ :
: | len | 2 | : | : +-------+-------+ ^ :
: | capacity | 2 | : | : ^ | :
: +-----------+-------+ : | : | '-------. :
: : | : | data:"Dog"| :
: : | : | +-------+--|-------+ :
`- - - - - - - - - - - - - -' | : +---|-+-----+ | name | o, 4, 4 | :
`--+-->| o o | o o-|----->| age | 5 | :
: +-|---+-|---+ +-------+----------+ :
: | | :
`- - -| - - |- - - - - - - - - - - - - - - - -'
| |
| | "Program text"
.- - -| - - |- - - - - - - - - - - - - - - - -.
: | | vtable :
: | | +----------------------+ :
: | `----->| "<Dog as Pet>::talk" | :
: | +----------------------+ :
: | vtable :
: | +----------------------+ :
: '----------->| "<Cat as Pet>::talk" | :
: +----------------------+ :
: :
'- - - - - - - - - - - - - - - - - - - - - - -'
```