c++ auto delete(malloc, new...)

c++_auto_delete.cpp

char *buffer = (char *)malloc(len);  
  
std::shared_ptr<void> _free_ptr((void *)buffer, [](void *p){  
	free(p);  
});  

// 补充
// FILE *fp = fopen("filepath", "rw");
// use shared_ptr deleter do fclose(fp)