The Programming Language Tips[7]

     file file("auto.txt");

     char buf[256];

     fread(buf, 0, 256, file);//即使这个操作会抛出异常，文件依然会被关闭

}

[c#，仅仅示例]

     public class file:idisposable { 

         private filestream fs; 

         public file(string path){

              fs = new filestream(path, filemode.create);

         } 

         public static implicit operator filestream(file file) {

              return file.fs;

         } 

         public void dispose() {

              fs.close();

         }

     }

[c#，仅仅示例]

     public class test{

         void test(){

              using(file file = new file("auto.txt")){

                   //some read, write, etc.