std::reverse() is a built-in function in C++'s Standard Template Library. The function takes in a beginning iterator, an ending iterator, and reverses the order of the element in the given range.
Take a look at the function signature of std::reverse() below:
std::reverse with a std::vector#include <vector>#include <iostream>// The following header needs to be included to use std::reverse()#include <algorithm>using namespace std;int main() {std::vector<int> values = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};std::cout << "Before reversing: ";for(int x: values) {std::cout << x << ' ';}std::reverse(values.begin(), values.end());std::cout << "\nAfter reversing: ";for(int x: values) {std::cout << x << ' ';}}
std::reverse with a std::string#include <string>#include <iostream>// The following header needs to be included to use std::reverse()#include <algorithm>using namespace std;int main() {std::string sentence = "Hello, World!";std::cout << "Before reversing: " << sentence << '\n';std::reverse(sentence.begin(), sentence.end());std::cout << "After reversing: " << sentence << '\n';}
std::reverse with a built-in array type#include <iostream>// The following header needs to be included to use std::reverse()#include <algorithm>// The following header needs to be included to use std::begin() and std::end()#include <iterator>using namespace std;int main() {int arr[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};std::cout << "Before reversing: ";for(int x: arr) {std::cout << x << ' ';}// built-in array has no begin() and end() member functions// but we can pass it to std::begin() and std::end()// in order to get the iterators we needstd::reverse(std::begin(arr), std::end(arr));std::cout << "\nAfter reversing: ";for(int x: arr) {std::cout << x << ' ';}}