==================================================sort.h==================================================                     void sort( void * p , int len , int perLen ,void (*pOrder)(void * , void * ) );==================================================sort.cc==================================================void sort( void * p , int len , int perLen ,void (*pOrder)(void * , void * ) ){char* pt = (char*)p ;for( int i = 0 ; i < len ; i++ ){for( int j = i ; j < len ; j++ ){pOrder(pt+i*perLen,pt+j*perLen ) ;}}}                     

    ==================================================main.cc==================================================#include <iostream>#include "sort.h"using namespace std;void orderInt( void * p1 , void * p2 ){int * t1 = (int*)p1 ;int * t2 = (int*)p2 ;if( *t1 > *t2 ){int temp = *t1 ;*t1 = *t2 ;*t2 = temp ;}}struct Person{char name[ 40 ] ;int age ;int id ;} ;void orderByAge( void * p1 , void* p2 ){Person * t1 = (Person*)p1 ;Person * t2 = (Person*)p2 ;if( t1->age > t2->age ){Person t = *t1 ;*t1 = *t2 ;*t2 = t ;}    }void orderById( void *p1 , void* p2 ){Person* t1 = (Person*)p1 ;Person* t2 = (Person*)p2 ;if( t1->id > t2->id ){Person t = *t1 ;*t1 = *t2 ;*t2 = t ;}}void orderByName( void * p1 , void* p2 ){Person* t1 = (Person*)p1 ;Person* t2 = (Person*)p2 ;if( strcmp( t1->name , t2->name ) > 0 ){Person t = *t1 ;*t1 = *t2 ;*t2 = t ;    }}int main(){int ia[] = { 3,1,6,3,6,8,3,468,89 };sort( ia , 9, sizeof(int), orderInt );for( int i = 0 ; i < 9 ; i++ ){cout<<ia[i] <<" " ;}cout<<endl;Person pers[ 3 ] ;pers[0].id = 1 ;pers[0].age = 29 ;strcpy( pers[0].name , "liucy" ) ;pers[1].id = 2 ;pers[1].age = 28 ;strcpy( pers[1].name , "huxinzhe" ) ;pers[2].id = 3 ;pers[2].age = 26 ;strcpy( pers[2].name , "xuehailu" ) ;    sort( pers , 3 , sizeof(Person), orderByAge );for( int i = 0 ; i < 3 ; i++ ){cout<<pers[i].name <<","<<pers[i].age<<",";cout<<pers[i].id<<endl ;}sort( pers, 3, sizeof( Person) , orderById ) ;for( int i = 0 ; i < 3 ; i++ ){cout<<pers[i].name <<","<<pers[i].age<<",";cout<<pers[i].id<<endl ;}sort( pers , 3 , sizeof( Person ) , orderByName );for( int i = 0 ; i < 3 ; i++ ){cout<<pers[i].name <<","<<pers[i].age<<",";cout<<pers[i].id <<endl;}return 0 ;}