Question

I get the following errors which is a slight improvement after taking weeks (very part-time) getting the errors out of my code:

1>C:\Program Files\Microsoft Visual Studio 9.0\VC\include\sstream(451) : error C2248: 'std::basic_ios<_Elem,_Traits>::basic_ios' : cannot access private member declared in class 'std::basic_ios<_Elem,_Traits>'
1>        with
1>        [
1>            _Elem=char,
1>            _Traits=std::char_traits<char>
1>        ]
1>        C:\Program Files\Microsoft Visual Studio 9.0\VC\include\ios(151) : see declaration of 'std::basic_ios<_Elem,_Traits>::basic_ios'
1>        with
1>        [
1>            _Elem=char,
1>            _Traits=std::char_traits<char>
1>        ]
1>        This diagnostic occurred in the compiler generated function 'std::basic_ostringstream<_Elem,_Traits,_Alloc>::basic_ostringstream(const std::basic_ostringstream<_Elem,_Traits,_Alloc> &)'
1>        with
1>        [
1>            _Elem=char,
1>            _Traits=std::char_traits<char>,
1>            _Alloc=std::allocator<char>
1>        ]

I am migrating from the CLI to std:: classes which I have even less experience with.

I think where it is saying “This diagnostic occurred in the compiler generated function” the function being referred to is my std::ostringstream os;.

I use os like as follows:

        os << "Level: " << levelName << ", contains unexpected header at line " << (numMatched + 1)
            << "\nExpected:\n" << longStringHeader;
        addToErrorSTDstring(os);

because std::string concatenation took a line up with each addition.

The only way I use ostringstream is

bool LevelParser::addToErrorSTDstring(std::ostringstream os){

which I believe ildjarn just perspicaciously identified as the problem for me.

Answer 1

The error indicates that you’re trying to copy an instance of std::ostringstream, but all standard streams are non-copyable objects (in C++11 they are, however, movable).

That’s the root of the problem, but without seeing your actual code we can’t give you concrete suggestions on how to fix it.

---

EDIT (in response to OP’s edit):

addToErrorSTDstring undoubtedly takes a std::ostringstream by value, i.e. has a signature like:

T addToErrorSTDstring(std::ostringstream os);

Instead, you need to pass it by reference, i.e. change the signature to something like:

T addToErrorSTDstring(std::ostringstream const& os);

or:

T addToErrorSTDstring(std::ostringstream& os);

(depending on how you use it).

If you’re new to C++, then you need to stop what you’re working on and brush up on language fundamentals such as references and const-correctness.