从Vector Inside Loop中删除元素

Delete Elements from Vector Inside Loop

本文关键字：删除 元素 Loop Vector Inside      更新时间：2023-10-16

我有一个向量words_in_family，类型为：vector<vector<string>>。我正在尝试删除words_in_family中不等于字符串向量largest_family的每个元素，但遇到了问题，不确定原因。感谢您的帮助。

for (int i = words_in_family.size() - 1; i >= 0; i--)
{
    if (words_in_family[i] != largest_family)
    {
        words_in_family.erase(words_in_family[i]);
    }
}

erase方法不取值。相反，使用迭代器作为erase方法的参数：

vector<vector<string>>::iterator it = words_in_family.begin();
for (int i = words_in_family.size() - 1; i >= 0; i--)
{
    if (words_in_family[i] != largest_family)
    {
        words_in_family.erase(it+i);
    }
}

迭代器擦除(迭代器位置(；迭代器擦除(先迭代器，后迭代器(；

请注意，std:：vector的迭代器是随机访问迭代器，因此您可以添加/减去整数值来获得其他有效迭代器。

C++std::vector擦除一个元素，在您的情况下：

从值等于largest_family:的向量(words_in_family(中擦除元素

std::vector<std::vector<std::string>>::iterator Itr;
for(Itr = Words_in_family.begin(); Itr != Words_in_family.end();)
{
    if(*Itr == largest_family)
    {
        Itr = Words_in_family.erase(Itr);
    }
    else
    {
        Itr++;
    }
}

words_in_family.erase(words_in_family.begin()+i, words_in_family.begin()+i+1);

erase将迭代器作为参数

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