AIX下cpp程序编译出现错误(ios::beg) 谢谢！ 哪有AIX的C++文档啊？

richardzhang

ifstream f;\r\nf.seekg(0,ios::beg);\r\n编译出现错误：\r\nThe reference to \"ios\" is ambiguous.\r\n\"/usr/vacpp/include/iostream.h\", line 78.7: 1540-0425 (I) \"ios\" is defined on line 78 of \"/usr/vacpp/include/iostream.h\".\r\n\"/usr/vacpp/include/iosfwd\", line 330.45: 1540-0425 (I) \"std::ios\" is defined on line 330 of \"/usr/vacpp/include/iosfwd\".\r\nmake: 1254-004 The error code from the last command is 1.\r\n\r\nifstream f;\r\nf.seekg(0,std::ios::beg);\r\n编译出现错误：\r\n\"/usr/vacpp/include/ios\", line 146.9: 1540-0300 (S) The \"private\" member \"std::basic_ios<char,std::char_traits<char> >::basic_ios(const _Myt &)\" cannot be accessed.\r\n\"/usr/vacpp/include/fstream\", line 237.15: 1540-0719 (I) The previous message was produced while processing the implicit member function \"std::basic_ifstream<char,struct std::char_traits<char> >::basic_ifstream(const basic_ifstream<char,std::char_traits<char> > &)\".\r\n请问如何改啊？谢谢！