impl IntoLuaMulti for &MultiValue

Author: khvzak

src/multi.rs

@@ -204,6 +204,23 @@ impl IntoLuaMulti for MultiValue {
     }
 }
 
+impl IntoLuaMulti for &MultiValue {
+    #[inline]
+    fn into_lua_multi(self, _: &Lua) -> Result<MultiValue> {
+        Ok(self.clone())
+    }
+
+    #[inline]
+    unsafe fn push_into_stack_multi(self, lua: &RawLua) -> Result<c_int> {
+        let nresults = self.len() as i32;
+        check_stack(lua.state(), nresults + 1)?;
+        for value in &self.0 {
+            lua.push_value(value)?;
+        }
+        Ok(nresults)
+    }
+}
+
 impl FromLuaMulti for MultiValue {
     #[inline]
     fn from_lua_multi(values: MultiValue, _: &Lua) -> Result<Self> {

tests/multi.rs

@@ -72,6 +72,26 @@ fn test_multivalue() {
     let _multi2 = MultiValue::from_vec(vec);
 }
 
+#[test]
+fn test_multivalue_by_ref() -> Result<()> {
+    let lua = Lua::new();
+    let multi = MultiValue::from_vec(vec![
+        Value::Integer(3),
+        Value::String(lua.create_string("hello")?),
+        Value::Boolean(true),
+    ]);
+
+    let f = lua.create_function(|_, (i, s, b): (i32, String, bool)| {
+        assert_eq!(i, 3);
+        assert_eq!(s.to_str()?, "hello");
+        assert_eq!(b, true);
+        Ok(())
+    })?;
+    f.call::<()>(&multi)?;
+
+    Ok(())
+}
+
 #[test]
 fn test_variadic() {
     let mut var = Variadic::with_capacity(3);