Implement a global map of entities

Implement a global map of entities, which allows referencing by either
position or ID and updating the positions of existent entities, and put
the character in there.

1 files changed, 13 insertions, 1 deletions

diff --git a/src/display/mod.rs b/src/display/mod.rs
index 664aaf319cc7..9e15a0d97d62 100644
--- a/src/display/mod.rs
+++ b/src/display/mod.rs
@@ -14,5 +14,17 @@ pub fn clear<T: Write>(out: &mut T) -> io::Result<()> {
 pub trait Draw: Positioned {
     /// Draw this entity, assuming the character is already at the correct
     /// position
-    fn do_draw<W: Write>(&self, out: &mut W) -> io::Result<()>;
+    fn do_draw(&self, out: &mut Write) -> io::Result<()>;
+}
+
+impl<T : Draw> Draw for &T {
+    fn do_draw(&self, out: &mut Write) -> io::Result<()> {
+        (**self).do_draw(out)
+    }
+}
+
+impl<T : Draw> Draw for Box<T> {
+    fn do_draw(&self, out: &mut Write) -> io::Result<()> {
+        (**self).do_draw(out)
+    }
 }