From 2481470c4489f2534a3d019b641f07de7294c04c Mon Sep 17 00:00:00 2001
From: lion187 <cy187lion@sina.com>
Date: Wed, 19 Jun 2019 16:01:47 +0800
Subject: [PATCH] =?UTF-8?q?=E6=96=B0=E5=BB=BA=E6=96=87=E4=BB=B6=20Software?=
 =?UTF-8?q?/Program/Language/Cpp/=E7=B1=BB=5FConst=5F=E6=88=90=E5=91=98.md?=
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 .../Program/Language/Cpp/类_Const_成员.md     | 34 +++++++++++++++++++
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 create mode 100644 Software/Program/Language/Cpp/类_Const_成员.md

diff --git a/Software/Program/Language/Cpp/类_Const_成员.md b/Software/Program/Language/Cpp/类_Const_成员.md
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+# 类 Const 成员
+
+类 const 成员为只读变量类型，其初始化需要通过初始化变量列表来完成：  
+
+```cpp
+class ClassA
+{
+public:
+    ClassA():Va(-1), Vb(true) { }
+    ClassA(int a=-1, bool b=true):Va(a), Vb(b) { }
+
+    cont int Va;
+    const bool Vb;
+}
+```
+
+如果某子类想要在构造时初始化父类的 const 成员，则需要在子类的初始化列表中调用父类的构造函数：  
+
+```cpp
+class ClassA
+{
+public:
+    ClassA(int a=-1, bool b=true):Va(a), Vb(b) { }
+
+    cont int Va;
+    const bool Vb;
+}
+
+class ClassB : public ClassA
+{
+    ClassB():ClassA(1, false) {}
+    ClassB(int a, bool b):ClassA(a, b) {}
+}
+```