From 9e8c6856539bc36da8d32e4dcd78ec9771d703c0 Mon Sep 17 00:00:00 2001
From: jiacai <jiacai_wang@qq.com>
Date: Sun, 25 Sep 2022 23:13:27 +0800
Subject: [PATCH] add inherit and class pointer casting

---
 .drone.yml        |  1 +
 class/inherit.cpp | 53 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 class/inherit.cpp

diff --git a/.drone.yml b/.drone.yml
index b7dcad8..7036cfb 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -8,3 +8,4 @@ steps:
 
       - cd class || exit
       - g++ construct.cpp -o construct && ./construct
+      - g++ inherit.cpp -o inherit && ./inherit
diff --git a/class/inherit.cpp b/class/inherit.cpp
new file mode 100644
index 0000000..1e2be11
--- /dev/null
+++ b/class/inherit.cpp
@@ -0,0 +1,53 @@
+#include <iostream>
+
+class Base1 {
+    virtual void func() {}
+    char ch;
+    // int val;
+};
+
+class Base2 {
+    virtual void func() {}
+    // char ch;
+    int val;
+};
+
+class Base3 {
+    // virtual void func() {}
+    char ch;
+    // int val;
+    // double val;
+};
+
+class Base4 {
+    // virtual void func() {}
+    // char ch;
+    int val;
+    // double val;
+};
+class Derived : public Base1, public Base2, public Base3, public Base4 {
+    virtual void func() {}
+    double val;
+};
+
+int main() {
+    Derived d1;
+    Derived* pd1 = &d1;
+    Base1* pb1 = &d1;
+    Base2* pb2 = &d1;
+    Base3* pb3 = &d1;
+    Base4* pb4 = &d1;
+
+    std::cout << "notice how those casts are performed according to member alignments" << std::endl;
+    std::cout << pd1 << std::endl
+              << pb1 << std::endl
+              << pb2 << std::endl
+              << pb3 << std::endl
+              << pb4 << std::endl;
+
+    std::cout << sizeof(Derived) << std::endl
+              << sizeof(Base1) << std::endl
+              << sizeof(Base2) << std::endl
+              << sizeof(Base3) << std::endl
+              << sizeof(Base4) << std::endl;
+}
\ No newline at end of file