How to open multiple files through single ifstream object?

怎样在定义了一个ifstream对象的情况下，打开多个文件。
重点：
每次打开新文件前，确保上一次的文件对象在close()之前被clear()！

// declare one ifstream object for every file

ifstream FileObject;

//open a input file which contain names of all files

ifstream InputFile("Input.txt");

while(std::getline(InputFile,buf)){
std::string name=buf;
FileObject.open(name.c_str());
if (!FileObject.is_open()){
//report error here.
continue;
}
while(std::getline(FileObject,buf2))
{  //doing some validation operations.  }
//Clear the fileobject for next use
FileObject.clear();
//Prepare for next open，每次打开前都要clear和close
FileObject.close(); 
}