From e3124e599dd7ac0924c46a87906326a013c873c9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=82=B9=E6=99=93=E8=88=AA?= <1210603696@qq.com>
Date: Mon, 19 Jan 2015 11:32:05 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0operator[]=E6=93=8D=E4=BD=9C?=
 =?UTF-8?q?=E7=9A=84const=E7=89=88=E6=9C=AC?=
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---
 TinySTL/Vector.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/TinySTL/Vector.h b/TinySTL/Vector.h
index 5a1d641..9b6a691 100644
--- a/TinySTL/Vector.h
+++ b/TinySTL/Vector.h
@@ -71,9 +71,10 @@ namespace TinySTL{
 		void shrink_to_fit();
 
 		//访问元素相关
-		value_type& operator[](const difference_type i){ return *(begin() + i); }
-		value_type& front(){ return *(begin()); }
-		value_type& back(){ return *(end() - 1); }
+		reference operator[](const difference_type i){ return *(begin() + i); }
+		const_reference operator[](const difference_type i)const{ return *(cbegin() + i); }
+		reference front(){ return *(begin()); }
+		reference back(){ return *(end() - 1); }
 		pointer data(){ return start_; }
 
 		//修改容器相关的操作