關於C++類方法函式指標的定義和使用方法

gaopengtttt發表於2016-08-25
C++函式指標

void (T_Database::*type_a)()=0;
注意一下類方法的函式指標的定義方法。 

點選(此處)摺疊或開啟

  1. 標頭檔案
  2. #include<iostream>
  3. using namespace std;
  4. class T_Database
  5. {
  6.         public:
  7.                 virtual void __Check() =0;
  8.                 virtual void __Rred() =0;
  9.                 virtual void __All() =0;
  10. };


  13. class T_Oracle:public T_Database
  14. {
  15.         public:
  16.                 virtual void __Check(){
  17.                         cout<<"Check ORA db"<<endl;
  18.                 }
  19.                 virtual void __Rred(){
  20.                         cout<<"Read ORA db"<<endl;
  21.                 }
  22.                 virtual void __All(){
  23.                         cout<<"Read and Check ORA db"<<endl;
  24.                 }
  25. };
  26. class T_Mysql:public T_Database
  27. {
  28.         public:
  29.                 virtual void __Check(){
  30.                         cout<<"Check MYSQL db"<<endl;
  31.                 }
  32.                 virtual void __Rred(){
  33.                         cout<<"Read MYSQL db"<<endl;
  34.                 }
  35.                 virtual void __All(){
  36.                         cout<<"Read and Check MYSQL db"<<endl;
  37.                 }
  38. };

  39. 點選(此處)摺疊或開啟

    1. 主調函式
    2. #include<iostream>
    3. using namespace std;
    4. #include"Class.h"

    6. int main(void)
    7. {
    8.         T_Database* db_a;
    9.         void (T_Database::*type_a)()=0;
    10.         int dbcho,typecho;
    11.         bool uinput=false;

    13.         while(uinput==false)
    14.         {
    15.                 cout<<"Input your db type[0]quit[1]Oracle[2]Mysql"<<endl;
    16.                 cin>>dbcho;
    17.                 switch(dbcho)
    18.                 {
    19.                         case 0:
    20.                                 {
    21.                                         uinput = true;
    22.                                         return 1;
    23.                                 }
    24.                         case 1:
    25.                                 {
    26.                                         db_a = new T_Oracle;
    27.                                         break;
    28.                                 }
    29.                         case 2:
    30.                                 {
    31.                                         db_a = new T_Mysql;
    32.                                         break;
    33.                                 }
    34.                         default:
    35.                                 {
    36.                                         cout<<"Please input 0-2"<<endl;
    37.                                         break;
    38.                                 }
    39.                 }
    40.                 if(dbcho!=1&&dbcho!=2)
    41.                 {
    42.                         continue;
    43.                 }

    45.                 cout<<"Input what do[0]quit[1]Check[2]Rred[3]All"<<endl;
    46.                 cin>>typecho;
    47.                 switch(typecho)
    48.                 {
    49.                         case 0:
    50.                                 {
    51.                                         cout<<"please input int"<<endl;
    52.                                         uinput = true;
    53.                                         return 2;
    54.                                 }
    55.                         case 1:
    56.                                 {
    57.                                         type_a = &T_Database::__Check;break;
    58.                                 }
    59.                         case 2:
    60.                                 {
    61.                                         type_a = &T_Database::__Rred;break;
    62.                                 }
    63.                         case 3:
    64.                                 {
    65.                                         type_a=&T_Database::__All;break;
    66.                                 }
    67.                         default:
    68.                         {
    69.                                 cout<<"Please input 0-3,will exit"<<endl;
    70.                                 return 3;
    71.                         }
    72.                 }
    73.                 (db_a->*type_a)();
    74.         }
    75.         return 0;
    76. }

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/7728585/viewspace-2124050/，如需轉載，請註明出處，否則將追究法律責任。

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