C++ 父类使用的this指针

比如说

----------------------------------------------------------

    父类

----------------------------------------------------------------

 class FatherClass

- {

| private:

|     static FatherClass* fatherClass;

| public:

|     FatherClass();

|     static FatherClass* getFatherClass();

| 

| };

----------------------------------------------------------------------

  #include"FatherClass.h"

  

  FatherClass* FatherClass::fatherClass = 0;

  

  FatherClass::FatherClass()

- {

|     fatherClass = this;

| }

----------------------------------------------------------------------------

------------------------------------------------------------------------

      子类

-------------------------------------------------------------

#include"FatherClass.h"

  

  class ChildClass:FatherClass

- {

| private:

|     int a;

| public:

|     ChildClass();

| 

| };

------------------------------------------------------------------------

  #include"ChildClass.h"

  ChildClass::ChildClass()

- {

|     this->a = 10; 

| }

main

------------------------------------------------------------

 #include"ChildClass.h"

  #include<iostream>

  using namespace std;

  

  int main()

- {

|     ChildClass child;

|     int Childlen = sizeof(ChildClass);

|     int FatherLen = sizeof(FatherClass);

|     int intThisLen = sizeof(FatherClass::getFatherClass());

|     cout<<"Childlen = "<<Childlen<<endl;   //4

|     cout<<"FatherLen = "<<FatherLen<<endl; //1

|     cout<<"intThisLen = "<<intThisLen<<endl; //4

|     return 0;

| }

多态就这样产生了。这种用法太咯了，而且也不安全。但是见了也不要怪。