stl(7)几种常见的迭代器

1.常规用于从前往后遍历的迭代器iterator

std::vector<int> vec;
for (int i = 0; i < 4; i++) {

vec.push_back(i);

}
for (std::vector<int>::iterator it = vec.begin(); it != vec.end(); it++) {

std::cout << *it << std::endl;

}

 

2.用于倒序遍历的迭代器reverse_iterator

std::vector<int> vec;
for (int i = 0; i < 4; i++) {

vec.push_back(i);

}

for (std::vector<int>::reverse_iterator it = vec.rbegin(); it != vec.rend(); it++) {

std::cout << *it << std::endl;

}

 

3.只读不能赋值的迭代器const_iterator

std::vector<int> vec;
for (int i = 0; i < 4; i++) {

vec.push_back(i);

}

printVec(vec)

void printVec(const std::vector<int> &vec) {
for (std::vector<int>::const_iterator it = vec.begin(); it != vec.end(); it++) {

std::cout << *it << std::endl;

}
}