Fix type register visibility. Add a few more examples

examples/custom_types_and_methods.rs

@@ -0,0 +1,30 @@
+extern crate rhai;
+use rhai::{Engine, FnRegister};
+
+#[derive(Debug, Clone)]
+struct TestStruct {
+    x: i32
+}
+
+impl TestStruct {
+    fn update(&mut self) {
+        self.x += 1000;
+    }
+
+    fn new() -> TestStruct {
+        TestStruct { x: 1 }
+    }
+}
+
+fn main() {
+    let mut engine = Engine::new();
+
+    engine.register_type::<TestStruct>();
+
+    &(TestStruct::update as fn(&mut TestStruct)->()).register(&mut engine, "update");
+    &(TestStruct::new as fn()->TestStruct).register(&mut engine, "new_ts");
+
+    if let Ok(result) = engine.eval("var x = new_ts(); x.update(); x".to_string()).unwrap().downcast::<TestStruct>() {
+        println!("result: {}", result.x); // prints 1001
+    }
+}

examples/hello.rs

@@ -0,0 +1,10 @@
+extern crate rhai;
+use rhai::Engine;
+
+fn main() {
+    let mut engine = Engine::new();
+
+    if let Ok(result) = engine.eval("40 + 2".to_string()).unwrap().downcast::<i32>() {
+        println!("Answer: {}", *result);  // prints 42
+    }
+}

examples/simple_fn.rs

@@ -0,0 +1,16 @@
+extern crate rhai;
+use rhai::{Engine, FnRegister};
+
+fn add(x: i32, y: i32) -> i32 {
+    x + y
+}
+
+fn main() {
+    let mut engine = Engine::new();
+
+    &(add as fn(x: i32, y: i32)->i32).register(&mut engine, "add");
+ 
+    if let Ok(result) = engine.eval("add(40, 2)".to_string()).unwrap().downcast::<i32>() {
+       println!("Answer: {}", *result);  // prints 42
+    }
+}

src/engine.rs

@@ -313,7 +313,7 @@ impl Engine {
         }
     }
 
-    fn register_type<T: Clone+Any>(&mut self) {
+    pub fn register_type<T: Clone+Any>(&mut self) {
         fn clone_helper<T: Clone>(t:T)->T { t.clone() };
 
         &(clone_helper as fn(T)->T).register(self, "clone");