ifstream通過引用返回對象

Question

//StoreManager.cpp
ifstream&  StoreManager::getDataReaderStream() 
{
        m_dataReader.open(m_dataReaderFileName.c_str(), ios::in | ios::binary);
        return m_dataReader; 
}
//multithread.cpp
void runThread (void *lpData) 
{       
 ifstream ifs1 = storeManager.getDataWriterStream();
 //other code 
}

嗨，我有以上課程結構

ifstream ifs1 = storeManager.getDataWriterStream();

我得到這個，請幫助我沒有得到這個，

/usr/include/c++/4.6/fstream: In copy constructor âstd::basic_ifstream<char>::basic_ifstream(const std::basic_ifstream<char>&)â:
/usr/include/c++/4.6/fstream:420:11: note: synthesized method âstd::basic_ios<char>::basic_ios(const std::basic_ios<char>&)â first required here
/usr/include/c++/4.6/streambuf: In copy constructor âstd::basic_filebuf<char>::basic_filebuf(const std::basic_filebuf<char>&)â:
/usr/include/c++/4.6/streambuf:782:7: error: âstd::basic_streambuf<_CharT, _Traits>::basic_streambuf(const __streambuf_type&) [with _CharT = char, _Traits = std::char_traits<char>, std::basic_streambuf<_CharT, _Traits>::__streambuf_type = std::basic_streambuf<char>]â is private
/usr/include/c++/4.6/fstream:69:11: error: within this context
/usr/include/c++/4.6/fstream: In copy constructor âstd::basic_ifstream<char>::basic_ifstream(const std::basic_ifstream<char>&)â:
/usr/include/c++/4.6/fstream:420:11: note: synthesized method âstd::basic_filebuf<char>::basic_filebuf(const std::basic_filebuf<char>&)â first required here
multithread.cpp: In member function âvirtual void Multithread::runThread(void*)â:
multithread.cpp:33:57: note: synthesized method âstd::basic_ifstream<char>::basic_ifstream(const std::basic_ifstream<char>&)â first required here

Answer 1

您正在嘗試復制-構造流，但無法完成。 您錯過了一個& ：

ifstream& ifs1 = storeManager.getDataWriterStream();
//------^