c++ - C++11 中带有指向 vector 指针的基于范围的 for 循环

Question

考虑以下示例:

vector<vector<char>*> *outer = new vector<vector<char>*>();
{
    vector<char> *inner = new vector<char>();

    inner->push_back(0);
    inner->push_back(1);
    inner->push_back(2);

    outer->push_back(inner);

    inner->push_back(3);
}

auto x = outer->at(0);

for (auto c : x) {
    cout << c << ",";
}

我想遍历 vector<char>* 的值;我怎样才能做到这一点？

Answer 1

为什么不简单地取消引用 x？

for (auto c : *x) { // Here
    cout << c << ",";
}

它将通过引用获取*x，因此不会复制。