status commit

bffhd/db/index.rs

@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2022 RLKM UG (haftungsbeschränkt).
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
+use std::marker::PhantomData;
+use lmdb::Transaction;
+use crate::db;
+use crate::db::{Adapter, DB};
+
+pub struct Index<I, A> {
+    db: DB<A>,
+    _marker: PhantomData<I>,
+}
+
+impl<I: AsRef<[u8]>, A: Adapter> Index<I, A> {
+    pub fn get<T: Transaction>(
+        &self, txn: &T, lookup: I,
+    ) -> Result<Option<A::Item>, db::Error> {
+        self.db.get(txn, lookup)
+    }
+}

bffhd/db/mod.rs

@@ -9,6 +9,8 @@ use std::fmt::{Debug, Display, Formatter};
 mod typed;
 pub use typed::{Adapter, AlignedAdapter, ArchivedValue, DB};
 
+mod index;
+
 pub type ErrorO = lmdb::Error;
 
 pub type Result<T> = std::result::Result<T, Error>;