C++ 尝试实施基本的进度指标

我有一个模板类，用于从文本文件加载数据，我想实现一个基本的进度指示器，因为数据集非常大

代码如下：

template <class T>
    void loadCustomers(const char* fileName, T& container)
    {
        ifstream fin(fileName, ios_base::in);
        int line = 0;
        char c;
        cout << "Loading " << fileName << ": ";
        while (fin)
        {
            line++;
            if (line % (custSize/10) == 0)
                cout << " *";

            Customer *temp;

            try
            {
                c = fin.peek(); 
                if (c == ios::traits_type::eof())
                    break;
                else if (c == 'C')
                    temp = new Customer();
                else
                    throw boost::bad_lexical_cast();

                fin >> *temp;
                container.addElementByDate(temp);
            }
            catch(boost::bad_lexical_cast&)
            {
                cerr << "Bad data found at line " << line 
                    << " in file "<< fileName << endl;
            }
        }

        fin.close();
        cout << endl;
    }

---

有人知道会发生什么吗？我能做些什么来强制它在应该打印的时候打印到屏幕上？

您应该刷新流以“强制”它在每次进度推进后显示数据：

cout.flush();

cout.flush();