fix format string errors

src/cpp.rs

@@ -182,7 +182,7 @@ private:"
     }
     writeln!(
         h,
-        "    explicit {}(bool owned, {1} *parent);
+        "    explicit {0}(bool owned, {1} *parent);
 public:
     explicit {0}({1} *parent = nullptr);
     ~{0}();",
@@ -385,7 +385,7 @@ fn write_cpp_object(w: &mut Vec<u8>, o: &Object, conf: &Config) -> Result<()> {
     let lcname = snake_case(&o.name);
     writeln!(
         w,
-        "{1}::{0}(bool /*owned*/, {2} *parent):
+        "{0}::{0}(bool /*owned*/, {2} *parent):
     {1}(parent),",
         o.name,
         base_type(o).0,