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freebsd 5.3, gcc3.4.2
这样一段代码，
ifstream infile;
string line;
infile.open("file1");
cout << "infile.is_open()=" << infile.is_open() << endl;
cout << "infile.eof()=" << infile.eof() << endl;
while(!infile.eof()){
std::getline(infile, line);
}
infile.close();
infile.open("file2");
cout << "infile.is_open()=" << infile.is_open() << endl;
cout << "infile.eof()=" << infile.eof() << endl;
infile.close();
输出的结果是，
infile.is_open()=1
infile.eof()=0
infile.is_open()=1
infile.eof()=1
而如果在file1的操作中去掉那段while的读操作，此时结果为，
infile.is_open()=1
infile.eof()=0
infile.is_open()=1
infile.eof()=0
看来close()并没有清除掉eof状态，解决的方法是调用一次clear()。
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