From d10e5bbfbfba9698cb33dd4c8cc950cc81d1f626 Mon Sep 17 00:00:00 2001
From: "rick.chan" <chenyang@autoai.com>
Date: Fri, 10 Jul 2020 11:34:14 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=20vector=20=E8=A1=A5?=
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Signed-off-by: rick.chan <chenyang@autoai.com>
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 .../Cpp_Standard_Library/vector_补充说明.md   | 26 +++++++++++++++++++
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 create mode 100644 Software/Development/Library/Cpp_Standard_Library/vector_补充说明.md

diff --git a/Software/Development/Library/Cpp_Standard_Library/vector_补充说明.md b/Software/Development/Library/Cpp_Standard_Library/vector_补充说明.md
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+# vector 补充说明
+
+## 删除指针成员
+
+vector 经常结合对象指针来使用，例如：
+
+```cpp
+class ClassA{ A(){} }
+
+vector<ClassA*> list;
+list.push_back(new ClassA());
+```
+
+此时调用 erase() 方法后不会 delete 掉 ClassA 的对象。正确释放资源的方法如下：
+
+```cpp
+vector<ClassA*>::iterator itr;
+
+for(itr=list.begin(); itr!=list.end();)
+{
+    delete (*itr);
+    list.erase(itr);
+}
+```
+
+这里，end() 指向最后一个元素的下一个位置；调用 delete (*itr) 释放对象；调用 erase() 后，itr 会自动 +1。因此 delete 必须在 erase() 前调用，由于 delete 后，只是析构了对象而没有修改 list 中的成员，因此可以继续调用 list.erase(itr)，释放 list 中对应的成员。