O'Reilly logo

C++ Cookbook by Jeff Cogswell, Jonathan Turkanis, Christopher Diggins, D. Ryan Stephens

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

7.6. Sorting a Range

Problem

You have a range of elements that you need to sort.

Solution

There are a handful of algorithms you can use for sorting a range. You can do a conventional sort (ascending or descending order) with sort, defined in <algorithm>, or you can use one of the other sorting functions, such as partial_sort . Have a look at Example 7-6 to see how.

Example 7-6. Sorting

#include <iostream> #include <istream> #include <string> #include <list> #include <vector> #include <algorithm> #include <iterator> #include "utils.h" // For printContainer(): see 7.10 using namespace std; int main() { cout << "Enter a series of strings: "; istream_iterator<string> start(cin); istream_iterator<string> end; // This creates a "marker" vector<string> v(start, end); // The sort standard algorithm will sort elements in a range. It // requires a random-access iterator, so it works for a vector. sort(v.begin(), v.end()); printContainer(v); random_shuffle(v.begin(), v.end()); // See 7.2 string* arr = new string[v.size()]; // Copy the elements into the array copy(v.begin(), v.end(), &arr[0]); // Sort works on any kind of range, so long as its arguments // behave like random-access iterators. sort(&arr[0], &arr[v.size()]); printRange(&arr[0], &arr[v.size()]); // Create a list with the same elements list<string> lst(v.begin(), v.end()); lst.sort(); // The standalone version of sort won't work; you have // to use list::sort. Note, consequently, that you // can't sort only parts of a list. printContainer(lst); ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required