Query manager code

src/data/entities.rs

@@ -1,3 +1,4 @@
+use std::cmp::Ordering;
 use crate::app::AppState;
 use crate::core::srs::{FADE_PER_DAY, MAX_SCORE, OrderMode, WordOpenMode};
 use crate::data::{INVALID_ID, Id};
@@ -178,7 +179,7 @@ impl CardStatistics {
     }
 }
 
-#[derive(Clone, Copy)]
+#[derive(Copy)]
 pub struct EntityHandle<E> {
     pub(crate) id: Id,
     pub(crate) real: bool,
@@ -187,6 +188,43 @@ pub struct EntityHandle<E> {
     
 }
 
+impl<T> Clone for EntityHandle<T> {
+    fn clone(&self) -> Self {
+        EntityHandle{
+            id: self.id,
+            real: self.real,
+            index: self.index,
+            _phantom: Default::default(),
+        }
+    }
+}
+impl<T> Eq for EntityHandle<T> {}
+
+impl<T> PartialEq<Self> for EntityHandle<T> {
+    fn eq(&self, other: &Self) -> bool {
+        self.real == other.real && self.id == other.id
+    }
+}
+impl<T> PartialOrd<Self> for EntityHandle<T> {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl<T> Ord for EntityHandle<T> {
+    fn cmp(&self, other: &Self) -> Ordering {
+        if self.real && !other.real {
+            return Ordering::Less
+        }
+        
+        if !self.real && other.real{
+            return Ordering::Greater
+        }
+        
+        self.id.cmp(&other.id)
+    }
+}
+
 pub trait EntityData{
     fn id(&self) -> Id;
     fn set_id(&mut self, id: Id);