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Update README.md

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Jonathan Turner 2016-03-02 14:40:39 -05:00
parent 2222991a92
commit 0fb8b9a394
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@ -55,7 +55,7 @@ struct TestStruct {
``` ```
Next, we create a few methods that we'll later use in our scripts. Notice that we register our custom type with the engine. Next, we create a few methods that we'll later use in our scripts. Notice that we register our custom type with the engine.
``` ```Rust
impl TestStruct { impl TestStruct {
fn update(&mut self) { fn update(&mut self) {
self.x += 1000; self.x += 1000;
@ -75,13 +75,13 @@ To use methods and functions with the engine, we need to register them. There a
Note: the engine follows the convention that functions take ownership of all their parameters and methods take ownership of all but their first parameter (which is a &mut). Note: the engine follows the convention that functions take ownership of all their parameters and methods take ownership of all but their first parameter (which is a &mut).
``` ```Rust
&(TestStruct::update as fn(&mut TestStruct)->()).register(&mut engine, "update"); &(TestStruct::update as fn(&mut TestStruct)->()).register(&mut engine, "update");
&(TestStruct::new as fn()->TestStruct).register(&mut engine, "new_ts"); &(TestStruct::new as fn()->TestStruct).register(&mut engine, "new_ts");
``` ```
Finally, we call our script. The script can see the function and method we registered earlier. We need to get the result back out from script land just as before, this time casting to our custom struct type. Finally, we call our script. The script can see the function and method we registered earlier. We need to get the result back out from script land just as before, this time casting to our custom struct type.
``` ```Rust
if let Ok(result) = engine.eval("var x = new_ts(); x.update(); x".to_string()).unwrap().downcast::<TestStruct>() { if let Ok(result) = engine.eval("var x = new_ts(); x.update(); x".to_string()).unwrap().downcast::<TestStruct>() {
println!("result: {}", result.x); // prints 1001 println!("result: {}", result.x); // prints 1001
} }