From fe7564d54d2b8f522f60f620fb99fe8133830b69 Mon Sep 17 00:00:00 2001
From: tao363 <306236356@qq.com>
Date: Mon, 19 Dec 2022 21:48:20 +0800
Subject: [PATCH] master

---
 codes/cpp/chapter_stack_and_queue/array_stack.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/codes/cpp/chapter_stack_and_queue/array_stack.cpp b/codes/cpp/chapter_stack_and_queue/array_stack.cpp
index 96a751035..c733e8491 100644
--- a/codes/cpp/chapter_stack_and_queue/array_stack.cpp
+++ b/codes/cpp/chapter_stack_and_queue/array_stack.cpp
@@ -29,6 +29,9 @@ public:
 
     /* 出栈 */
     int pop() {
+        if(stack.empty()){
+            throw out_of_range("栈为空,不能执行: pop()函数");
+        }
         int oldTop = stack.back();
         stack.pop_back();
         return oldTop;
@@ -36,11 +39,17 @@ public:
 
     /* 访问栈顶元素 */
     int top() {
+        if(stack.empty()){
+            throw out_of_range("栈为空,不能执行: top()函数");
+        }
         return stack.back();
     }
 
     /* 访问索引 index 处元素 */
     int get(int index) {
+        if(stack.size() < index){
+            throw out_of_range("超出栈空间大小");
+        }
         return stack[index];
     }