File I/O: ios has not been declared?

I don't know what's wrong. I've included "fstream" and "iostream", but the compiler said 'ios' has not been declared? Here's the faulty code:

Code:

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        std::ofstream binary_file("settings.dat",ios::out|ios::binary);
        binary_file.write(reinterpret_cast<char *>(&mData),sizeof(SettingData));
        binary_file.close();

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What's wrong with it?

Nevermind that. I've forgotten to add std namespace. Silly me. Sorry for the bogus question. ;)