如何使用 fstream fstream::app 标志附加到文件似乎不起作用
我只是想写入（附加）到日志文件。我在这里查了一下：
http://www.cplusplus.com/reference/iostream/fstream/open/
这就是我所做的
#include <fstream>
fstream outfile;
//outfile.open("/tmp/debug.txt" ); // works, simply for writing
outfile.open("/tmp/debug.txt", fstream::app ); // does nothing
outfile << "START" << endl;
outfile.close();
i simply want to write (append) to a logfile. I looked it up here:
http://www.cplusplus.com/reference/iostream/fstream/open/
so this is what i did
#include <fstream>
fstream outfile;
//outfile.open("/tmp/debug.txt" ); // works, simply for writing
outfile.open("/tmp/debug.txt", fstream::app ); // does nothing
outfile << "START" << endl;
outfile.close();
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fstream::app|fstream::out而不是fstream::app。如果不指定out，app就没有意义（人们可能认为它应该隐含out，但事实并非如此）。fstream::app|fstream::outinstead offstream::app.appdoesn't make sense without specifyingout(one could think it should have impliedout, but it doesn't).