cpp/named req/ReversibleContainer

The concept Template:concept is a Forward Container whose iterators are Bidirectional Iterators. It allows backwards iteration through the container. It means that it can produce iterators that move backward from the end, as well as iterators that move forward from the beginning.

Standard library

The following standard library facilities.

Template:cpp/container/dcl list rbeginTemplate:cpp/container/dcl list rend

Example

The following example uses vector but will work with all containers that support iteration.

Run this code

#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include "../require.h"
 
using namespace std;
 
int main() {
    ifstream in("Reversible.cpp");
    assure(in, "Reversible.cpp");
    string line;
    vector<string> lines;
    while(getline(in, line))
        lines.push_back(line);
    for(vector<string>::reverse_iterator r = lines.rbegin();
        r != lines.rend(); r++)
        cout << *r << endl;
}