pthread_create 报函数参数不匹配问题

pthread_create方法遇到类方法时总会报  argument of type ‘void* (Thread::)(void*)’ does not match ‘void* (*)(void*)’
pthread_create方法第三个参数只能是C函数指针或者类到静态函数指针。
下面记录一下解决方法

 include <stdio.h>
 #include <pthread.h>
 #include <unistd.h>

 class Thread{
 public:
     Thread(int num = ):_num(num){ }

     static void *work(void *args){  //静态函数有访问函数, 变量限制, 这里直接传入类指针变量
         Thread *handle = (Thread*)args;
         for (int i = ; i < handle->_num; ++i){
             printf("sleep i = %d\n", i);
             sleep();
         }
         pthread_exit(NULL);
     }   

     int _num;
 };

 void *inc_count(void *args){
     for (int i = ; i < ; ++i){
         printf("inc_count i = %d\n", i);
         sleep();
     }
     pthread_exit(NULL);
 }

 int main(){
     Thread obj;
     pthread_t threads[];

     pthread_create(&threads[], NULL, inc_count, NULL);     //必须是C函数指针
     pthread_create(&threads[], NULL, Thread::work, &obj);  //或者时类静态函数指针
     obj._num = ; 

     pthread_join(threads[], NULL);
     pthread_join(threads[], NULL);
     return ;
 }