ofstream object as variable

February 4, 2023

I am trying to create multiple file according to filename in cpp. Using ofstream for that and could not achieve for now. Appreciate if anyone help me about that.

I am writing down here

static std::ofstream text1;
static std::ofstream text2;


class trial{
public:
if(situation == true) {
document_type = text1;
}
if(situation == false) {
document_type = text2;
}

document_type << "hello world" << "\n";

}

ofstream object as variable

>Solution :

Assignment copies the objects, and it’s not possible to create copies of streams. You can only have reference to streams, and you can’t reassign references.

Instead I suggest you pass a reference to the wanted stream to the trial constructor instead, and store the reference in the object:

struct trial
{
    trial(std::ostream& output)
        : output_{ output }
    {
    }

    void function()
    {
        output_ << "Hello!\n";
    }

    std::ostream& output_;
};

int main()
{
    bool condition = ...;  // TODO: Actual condition

    trial trial_object(condition ? text1 : text2);
    trial_object.function();
}

Also note that I use plain std::ostream in the class, which allows you to use any output stream, not only files.