c++ - 不使用线程的并行 while 循环

Question

(C++)有没有可能在不使用线程的情况下运行两个并行的 while 循环？我试过将它们一个接一个地放在一个 for 循环中，但这对我不起作用，因为我在 while 条件中使用的变量在第一个循环中发生了变化，我需要它对两者都相同循环。这是代码:

for (size_t j = 0; j < word.length(); j++)
{       
    while (word[j] != tmp->data)
    {
        counter1++;
        tmp = tmp->next;
    }
    while (word[j] != tmp->data)
    {
        counter2++;
        tmp = tmp->previous;
    }       
}

Answer 1

来自评论:

I'm getting the letter from a string and trying to find out which path is shorter to get to the same letter in alphabet, going forward or backwards. I am using cyclical doubly linked list.

听起来您只需要一个带有两个 tmp 指针的 while 循环:

for (size_t j = 0; j < word.length(); j++)
{       
    while (word[j] != tmp1->data && word[j] != tmp2->data)
    {
        counter++;
        tmp1 = tmp1->next;
        tmp2 = tmp2->previous;
    }       
}