#include <iostream> #include <vector> using namespace std; int main() { int ar[10] = { 1,2,3,4,5,6,7,8,9,0 }; std::vector<int> vec5(ar, ar + 10); // reverse size_t cap1 = vec5.capacity(); // = 10 vec5.reserve(20); // = Request a change in capacity size_t cap2 = vec5.capacity(); // = 20 // data() int * pInt = vec5.data(); for (size_t i=0; i<vec5.size(); ++i) { cout << pInt[i]; } cout << endl; // 1234567890 // begin end for (auto it=vec5.begin(); it != vec5.end(); ++it) { cout << *it; } cout << endl; // 1234567890 // cbegin cend 常量,保证不改变 vector 中的元素 for (auto it = vec5.cbegin(); it != vec5.cend(); ++it) { cout << *it; } cout << endl; // 1234567890 // rbegin rend 注意偏移是 ++ 操作 for (auto it = vec5.rbegin(); it != vec5.rend(); ++it) { cout << *it; } cout << endl; // 0987654321 // iterator erase (const_iterator position); vec5.erase(vec5.begin()); // delete 1; size = 9 // iterator erase (const_iterator first, const_iterator last); vec5.erase(vec5.begin(), vec5.begin()+2); // delete 2, 3; size = 7 // max_size; Returns the maximum number of elements that the vector can hold. // 系统或者库的设计上线。并非机器所能申请的最大大小。 size_t maxSize = vec5.max_size(); std::vector<int> vec6(2); vec5.swap(vec6); // 两者交换 //vec5.swap(std::vector<int>()); // 2015支持,2017不支持 }
原文地址:https://www.cnblogs.com/alexYuin/p/12032231.html
时间: 2024-10-12 20:01:26