feat: add SyncIndex::get method

Author: Кирилл Безуглый

CHANGELOG.md

@@ -8,6 +8,7 @@
 - `tlua::LuaRead` trait implementations for `OsString`, `PathBuf`
 - tlua::LuaTable::metatable which is a better alternative to the existing `tlua::LuaTable::get_or_create_metatable`
 - `ffi::tarantool::box_schema_version` and `ffi::tarantool::box_session_id` functions
+- `network::protocol::SyncIndex::get` method
 
 ### Changed
 

tarantool/src/network/protocol/mod.rs

@@ -43,11 +43,18 @@ pub enum ProtocolError {
 pub struct SyncIndex(pub(crate) u64);
 
 impl SyncIndex {
+    /// Increments current sync value.
     pub fn next_index(&mut self) -> Self {
         let sync = self.0;
         self.0 += 1;
         Self(sync)
     }
+
+    /// Returns current sync value.
+    #[inline(always)]
+    pub fn get(&self) -> u64 {
+        self.0
+    }
 }
 
 #[deprecated = "use `TarantoolError` instead"]