使用初始化列表初始化类中的std :: ofstream

Question

I want to initialize a private std::ofstream (say, to a file opened in main ) in a constructor using an initializer list. I have the following code:

class MyClass{
    std::ofstream ofs;
public:
    MyClass(const std::ofstream &ofs): ofs(ofs) { }
};

and I get the following compile error:

error C2248: 'std::basic_ofstream<_Elem,_Traits>::basic_ofstream' : cannot access private member declared in class 'std::basic_ofstream<_Elem,_Traits>'
      with
      [
          _Elem=char,
          _Traits=std::char_traits<char>
      ]
      c:\program files (x86)\microsoft visual studio 11.0\vc\include\fstream(1034) : see declaration of 'std::basic_ofstream<_Elem,_Traits>::basic_ofstream'
      with
      [
          _Elem=char,
          _Traits=std::char_traits<char>
      ]

What's happening here?

Answer 1

Take a look at cppreference

basic_ofstream( const basic_ofstream& rhs) = delete;    (5)     (since C++11)

It is not possible to copy construct a basic_ofstream .

Possibly you are using pre-c++11 compiler and it is marked as private in the library.