From 57acf971a57e8e9fa6181ac2fefdeadd86e9202c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E6=98=B1=E5=AE=89?= <31612534@qq.com>
Date: Sun, 8 Nov 2020 22:13:54 +0800
Subject: [PATCH] add [] getData

add [] getData
---
 include/circular_buffer.hpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/circular_buffer.hpp b/include/circular_buffer.hpp
index 0d5ae03..c57046a 100644
--- a/include/circular_buffer.hpp
+++ b/include/circular_buffer.hpp
@@ -468,7 +468,21 @@ namespace jm {
         {
             return JM_CB_ADDRESSOF(_buffer[0]._value);
         }
+        
+        JM_CB_CXX14_CONSTEXPR reference operator[](size_type i) JM_CB_NOEXCEPT
+        {
+            return _buffer[(_head + i) % N]._value;
+        }
 
+        JM_CB_CXX14_CONSTEXPR reference at(size_type i)
+        {
+            if (i >= N)
+            {
+                throw std::out_of_range("Array index error");
+            }
+            return _buffer[(_head + i) % N]._value;
+        }
+        
         /// modifiers
         void push_back(const value_type& value)
         {