http://blog.csdn.net/u011857683/article/details/52294353

1.思路：

靜態(tài)成員函數(shù)屬于類(lèi)(通過(guò)類(lèi)訪問(wèn)，調(diào)用函數(shù)時(shí)沒(méi)有提供this指針)，
非靜態(tài)成員函數(shù)屬于實(shí)例（通過(guò)對(duì)象訪問(wèn)）（默認(rèn)都提供了this指針），
非靜態(tài)成員也屬于實(shí)例（通過(guò)對(duì)象訪問(wèn)），
所以，要想在靜態(tài)成員函數(shù)訪問(wèn)非靜態(tài)成員變量，
無(wú)非就是實(shí)例化一個(gè)對(duì)象，然后通過(guò)對(duì)象訪問(wèn)非靜態(tài)成員變量。

2.實(shí)現(xiàn)方法

第一種：類(lèi)外實(shí)例化對(duì)象，傳參數(shù)（看自己需要使用值、地址、引用）

[cpp]?view plain?copy

class?Test??

{??

public:??

???????Test()?{??}??

???????~Test(){??}??

??????void?static?testFun(Test&?test);??

??

private:??

??????int?m_a;??

??

??

};??

??

??

?????void?Test::testFun(Test&?test)??

????{??

??????????test.m_a=20;??

???}??

第二種：類(lèi)外實(shí)例化對(duì)象，全局對(duì)象

[cpp]?view plain?copy

Test?test;??

??

??

class?Test??

{??

public:??

???????Test(){??}??

???????~Test(){???}??

???????void?static?testFun();??

??

private:??

???????int?m_a;??

??

??

};??

??

??

?????void?Test::testFun()??

????{??

???????????test.m_a=20;??

?????}??

第三種：類(lèi)中實(shí)例化對(duì)象，在創(chuàng)建的時(shí)候把this指針賦值給那個(gè)靜態(tài)成員

[cpp]?view plain?copy

#include<stdio.h>??

#include<string.h>??

??

??

class?Test??

{??

public:??

???????Test()?{???test?=?this?;?}??

???????~Test(){??}??

???????void?static?testFun();??

???????void?printMember();??

??

private:??

?????int?m_a;??

????static?Test*?test;??

??

??

};??

???Test*?Test::test;????????????????????????//靜態(tài)成員需要初始化??

??

??

????void?Test::testFun()??

????{??

??????????test->m_a=20;?????????????

????}??

??

??

?????void?Test::printMember()??

????{??

?????????printf("%d\n",?this->m_a);???

???}??

??

??

????int?main()??

???{??

????????Test?test1;??

????????Test::testFun();??

?????????test1.printMember();?????????????//輸出20,?成功改變成員變量m_a的值??

??

??

?????return?0;??

???}??

單實(shí)例

[cpp]?view plain?copy

#include<stdio.h>??

#include<stdlib.h>??

#include<time.h>??

#include<string.h>??

??

??

??

#include<stdio.h>????

#include<string.h>????

????

????

class?Test????

{????

private:??

????Test()?{??};??

public:????

???????static?Test*?getTest()?{?????

???????????static?Test?instance;????

???????????test?=?&instance?;??

???????????return?&instance;}????

???????~Test(){?printf("sdg\n");?}????

???????void?static?testFun();????

???????void?printMember();????

????

private:????

?????int?m_a;????

????static?Test*?test;????

????

????

};????

Test*?Test::test;????????????????????????//靜態(tài)成員需要初始化????

????

????

????void?Test::testFun()????

????{????

??????????test->m_a=20;???????????????

????}????

????

????

?????void?Test::printMember()????

????{????

?????????printf("%d\n",?this->m_a);?????

???}????

????

????

????int?main()????

???{????

????????Test*?test1?=?Test::getTest();????

????????Test*?test2?=?Test::getTest();????

????????Test::testFun();????

????????test1->printMember();?????????????//輸出20,?成功改變成員變量m_a的值????

????test2->printMember();?????????????//輸出20,?成功改變成員變量m_a的值????

????

????

?????return?0;????

???} ? ?

總結(jié)

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