如何检查传递的Iterator是一个随机访问迭代器？

#include <iostream>
#include <iterator>
#include <vector>

template <typename Iterator>
bool isRandomAccessIterator(const Iterator& iter) {
    using traits = std::iterator_traits<Iterator>;
    return std::is_same<typename traits::iterator_category, std::random_access_iterator_tag>::value;
}

int main() {
    std::vector<int> vec;
    auto iter = vec.begin();

    if (isRandomAccessIterator(iter)) {
        std::cout << "Iterator is a random access iterator." << std::endl;
    } else {
        std::cout << "Iterator is not a random access iterator." << std::endl;
    }

    return 0;
}