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update hello-world

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This commit is contained in:
Niko Matsakis 2018-11-01 05:59:33 -04:00
parent 206af35e2b
commit 4a8b9123e6
1 changed files with 9 additions and 9 deletions
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18
examples/hello_world/README.md
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@ -163,11 +163,11 @@ start using it:
```rust
fn main() {
let db = DatabaseStruct::default();
let mut db = DatabaseStruct::default();
println!("Initially, the length is {}.", db.length().get(()));
db.query(InputString)
db.query_mut(InputString)
.set((), Arc::new(format!("Hello, world")));
println!("Now, the length is {}.", db.length().get(()));
@ -177,16 +177,16 @@ fn main() {
One thing to notice here is how we set the value for an input query:
```rust
db.query(InputString)
db.query_mut(InputString)
.set((), Arc::new(format!("Hello, world")));
```
The `db.query(Foo)` method takes as argument the query type that
characterizes your query. It gives back a "query table" type, which
offers you more advanced methods beyond simply executing the query
(for example, for input queries, you can invoke `set`). In fact, the
standard call `db.query_name(key)` to access a query is just a
shorthand for `db.query(QueryType).get(key)`.
The `db.query_mut(Foo)` method takes as argument the query type that
characterizes your query. It gives back a "mutable query table" type,
which lets you invoke `set` to set the value of an input query. There
is also a `query` method that gives access to other advanced methods
in fact, the standard call `db.query_name(key)` to access a query is
just a shorthand for `db.query(QueryType).get(key)`.
Finally, if we run this code: