Question

I have the following data-structure as a class named “Task”:

private:
string name;
int computation_time;
int period;

Furthermore i have a ASCII-File with this content:

A 3 10
B 2 12
C 1 11

name = A, computation_time = 3, period = 10 and so on….

Now i want to read in the file, create Task-object and push it back into a vector:

void read_in_task_list_and_create_tasks(const string &filename, vector<Task> &current_tasks)
{
    ifstream in_file;
    in_file.open(filename.c_str());

    string tmp_name;
    int tmp_computation_time;
    int tmp_period;

    while(!in_file.eof())
    {
        in_file >> tmp_name;
        in_file >> tmp_computation_time;
        in_file >> tmp_period;

//        Task tmp_task(tmp_name, tmp_computation_time, tmp_period);
//        current_tasks.push_back(tmp_task);
        current_tasks.push_back(Task(tmp_name, tmp_computation_time, tmp_period));
    }
}

Now, when i take a look into current_tasks vector, it has elements, but their values dont match my in_file values.
Watch the outcommented lines. tmp_task object is exactly correct, but if it’s getting pushed back, it loses it’s values like descriped above.

Could this be a Copy-Constructor Issue in Task-class, because std::vector is managing the memory-allocation?

I’m using netbeans with g++ compiler on Linux x86.

THX

Answer 1

Make sure there are no copy constructors or assignment operators defined.

The automatic ones should do exactly what you want.