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Add missing db param in book example

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Lukas Wirth 2022-08-18 13:00:43 +02:00
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1 changed files with 2 additions and 2 deletions
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book/src/overview.md
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@ -114,7 +114,7 @@ Finally, you can also modify the value of an input field by using the setter met
Since this is modifying the input, the setter takes an `&mut`-reference to the database: Since this is modifying the input, the setter takes an `&mut`-reference to the database:
```rust ```rust
file.set_contents(String::from("fn foo() { /* add a comment */ }")); file.set_contents(&mut db, String::from("fn foo() { /* add a comment */ }"));
``` ```
## Tracked functions ## Tracked functions
@ -216,7 +216,7 @@ Sometimes it is useful to define a tracked function but specify its value for so
For example, maybe the default way to compute the representation for a function is to read the AST, but you also have some built-in functions in your language and you want to hard-code their results. For example, maybe the default way to compute the representation for a function is to read the AST, but you also have some built-in functions in your language and you want to hard-code their results.
This can also be used to simulate a field that is initialized after the tracked struct is created. This can also be used to simulate a field that is initialized after the tracked struct is created.
To support this use case, you can use the `specify` method associated with tracked functions. To support this use case, you can use the `specify` method associated with tracked functions.
To enable this method, you need to add the `specify` flag to the function to alert users that its value may sometimes be specified externally. To enable this method, you need to add the `specify` flag to the function to alert users that its value may sometimes be specified externally.
```rust ```rust