[linux,c++] 使用指针函数实现多个函数调用_多个函数中调用指针-优快云博客

本文链接：https://blog.youkuaiyun.com/inuyasha1027/article/details/40514601

这篇博客通过C++代码示例展示了如何在Linux环境下使用指针函数来调用多个函数，详细解释了实现复杂功能入口点的步骤。

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//g++ -o funcEntry funcEntry.hpp funcEntry.cpp

#include <iostream>
#include <string>
#include <map>

#ifndef FUNCENTRY_HPP__
#define FUNCENTRY_HPP__


enum LEVEL_TYPE
{
LEVEL_SYSTEM = 0 ,
LEVEL_PROGRAMMER ,
LEVEL_ORDINARY
} ;

typedef int (*funcEntryPoint) ( char *)  ; 
//define the pointer function ,we also name it the entry address of function

funcEntryPoint getFuncEntryPointByType  ( LEVEL_TYPE type ); 
//we send different enum type value ,and get target function entry 

int systemLevelEntryPoint               ( char * ) ; 
//send LEVEL_SYSTEM ,get systemLevelEntryPoint function entry 

int programmerLevelEntryPoint           ( char * ) ; 
//send LEVEL_PROGRAMMER ,get programmerLevelEntryPoint pointer function 

int ordinaryLevelEntryPoint             ( char * ) ; 
//after getting function entry point , we can regard it as the function itself 

#endif

#include "funcEntry.hpp"


using namespace std ;


funcEntryPoint getFuncEntryPointByType ( LEVEL_TYPE type )
{
        switch ( type )
        {
        case LEVEL_SYSTEM :
                return systemLevelEntryPoint ;
        case LEVEL_PROGRAMMER :
                return programmerLevelEntryPoint  ;
        case LEVEL_ORDINARY:
                return ordinaryLevelEntryPoint ;
        default :
                cout<<"error type " ;
                return NULL ;
        }
}


int systemLevelEntryPoint ( char * line )
{
        cout<<" system "<<endl ;
        cout<<line<<endl ;
        return 0 ;
}


int programmerLevelEntryPoint ( char *line )
{
        cout<<"programmer"<<endl ;
        cout<<line<<endl ;
        return 0 ;
}


int ordinaryLevelEntryPoint ( char *line )
{


        cout<<"ordinary"<<endl ;
        cout<<line<<endl ;

        return 0 ;
}


int main ( int argc , char * argv[] )
{
        funcEntryPoint entryFunc ;


        entryFunc = getFuncEntryPointByType ( LEVEL_SYSTEM) ;		
	//we get systemLevelEntryPoint function entry 

        entryFunc("i am system level function !") ;			
	//we use function entry just like use the method itself


        entryFunc = getFuncEntryPointByType ( LEVEL_PROGRAMMER ) ;
        entryFunc("i am programmer level function !") ;


        entryFunc = getFuncEntryPointByType ( LEVEL_ORDINARY ) ;
        entryFunc("i am ordinary user level function !") ;


        return 0 ;
}

in the next section , we will implement a more complex function entry point test ,

on base of this

//coding me