From 47dbbc518c974ccb668bdd4f4a4f9d69ffdf096e Mon Sep 17 00:00:00 2001
From: Sergey Kacheev <skacheev@yandex-team.ru>
Date: Tue, 27 Mar 2018 20:09:26 +0700
Subject: [PATCH] call current_cfg only once

---
 src/pda.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/pda.rs b/src/pda.rs
index 3fdaff1..296569b 100644
--- a/src/pda.rs
+++ b/src/pda.rs
@@ -222,9 +222,10 @@ impl DPDA {
     }
 
     pub fn accepting(&self) -> bool {
-        let accept = self.accept_states.contains(&self.current_cfg().state);
+        let cfg = self.current_cfg();
+        let accept = self.accept_states.contains(&cfg.state);
         if self.accept_by_empty_stack {
-            accept && self.current_cfg().stack.is_empty()
+            accept && cfg.stack.is_empty()
         } else {
             accept
         }