reverse iterator c 2b 2b

1// Using iterators
2for (auto it = s.crbegin() ; it != s.crend(); ++it) {
3  std::cout << *it;
4}
5
6// Naive
7for (int i = s.size() - 1; i >= 0; i--) {
8  std::cout << s[i];
9}
10

1// string::rbegin/rend
2#include <iostream>
3#include <string>
4
5int main ()
6{
7  std::string str ("now step live...");
8  for (std::string::reverse_iterator rit=str.rbegin(); rit!=str.rend(); ++rit)
9    std::cout << *rit;
10  return 0;
11}

1// A reverse_iterator example using vectors
2
3#include <iostream>
4#include <vector>
5
6int main() {
7	std::vector<int> vec = {1, 2, 3, 4, 5};
8  	std::vector<int>::reverse_iterator r_iter;
9  
10    // rbegin() points to the end of the vector, and rend()
11    // points to the front. Use crbegin() and crend() for
12  	// the const versions of these interators.
13    for (r_iter = vec.rbegin(); r_iter != vec.rend(); r_iter++) {
14        std::cout << *r_iter << std::endl;
15    }
16  	
17  	return 0;
18}

1...evil pets won
2