class simpleClass
{
public:
static int n_count;
int n_value;
char c;
simpleClass() { printf("Create base class.\n"); }
virtual ~simpleClass() { printf("Destroy base class.\n"); }
int get_value(void);
virtual void foo(void) { printf("foo in base class.\n"); }
static void add_count();
};
class dsimpleClass : public simpleClass
{
public:
int n_sub_value;
dsimpleClass() { printf("create derived class.\n\n"); }
~dsimpleClass() { printf("destroy derived class.\n"); }
virtual void foo() { printf("foo in derived class.\n"); }
};
#include <stdlib.h>
#include <stdio.h>
#include "gtest.h"
int simpleClass::n_count = 0;
int main()
{
dsimpleClass asimple;
printf("Object start address: %x\n", &asimple);
printf("n_value address: %x\n", &asimple.n_value);
printf("c address: %x\n", &asimple.c);
printf("n_subvalue address: %x\n", &asimple.n_sub_value);
printf("base class size: %d ; derived class size: %d\n\n", sizeof(simpleClass), sizeof(dsimpleClass));
system("pause");
return 0;
}
[C++应用程序性能优化]单继承
最新推荐文章于 2021-04-10 20:15:36 发布
本文通过一个C++示例介绍了基类和派生类的概念。代码中定义了一个简单的基类simpleClass,并在此基础上创建了派生类dsimpleClass。通过对对象地址及成员变量地址的打印,展示了类继承中的内存布局。
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