我正在从文本文件中的列表中阅读时间，格式如下
我需要每隔一行进行分析，但是，当我读入它并尝试使用“std：：stof（）”函数将其转换为可用形式时，它在第一次转换时挂起（在4核i7的单核上需要10分钟以上）。

while (tf.is_open()) {
i++;
//std::cout << i << std::endl;
std::getline(tf, full);
std::stringstream tbreak;
tbreak.str(full);
int k = 0;
std::string milsec;
while (std::getline(tbreak, time, ' '))
{
//  std::cout << k << std::endl;
    if (k % 2 == 0) {
        k++;
        continue;
    }
    std::stringstream hrminsec;
    hrminsec.str(time);

    int m = 0;
    while (std::getline(hrminsec, brokentime, ':'))
    {
        //std::cout << brokentime << std::endl;

        if (m % 2 == 0)
        {
            m++;
            continue;
        }
        //if (m % 2 == 1) time = brokentime;
        //if (m % 3 == 2) milsec =brokentime;
        if (brokentime == "time" || brokentime == "times")
        {
            m++;
            continue;
        }
        //std::cout << brokentime << std::endl;
        std::stringstream further;
        int n = 0;
        further.str(brokentime);
        std::string temp;
        while (std::getline(further, temp, '.'))
        {
            //std::cout << temp << std::endl;
            if (n % 2 == 0) time = temp;
            time.erase(0, time.find_first_not_of('0'));
            //std::cout<<time <<std::endl;
            if (n % 2 == 1)milsec = temp;
            n++;
            if (i % 2 == 0) {
                float temp1 = std::stof(time);
                std::cout << temp1 << std::endl;
                float temp2 = std::stof(milsec);
                temp1 = temp1 + 0.01*temp2;
                int j = i - 2;
                t[j] = temp1;
                std::cout << j << std::endl;
            }
        }

        m++;
    }
    k++;
}

这编译得很好，大部分子循环都是为了正确编译。如果有关系的话，我正在Windows 10上使用Visual Studio 15。