devirtualize database

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/util.rs

@@ -0,0 +1,13 @@
+use conduit::Result;
+
+#[inline]
+pub(crate) fn result<T>(r: std::result::Result<T, rocksdb::Error>) -> Result<T, conduit::Error> {
+	r.map_or_else(or_else, and_then)
+}
+
+#[inline(always)]
+pub(crate) fn and_then<T>(t: T) -> Result<T, conduit::Error> { Ok(t) }
+
+pub(crate) fn or_else<T>(e: rocksdb::Error) -> Result<T, conduit::Error> { Err(map_err(e)) }
+
+pub(crate) fn map_err(e: rocksdb::Error) -> conduit::Error { conduit::Error::Database(e.into_string()) }