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sort
Sorts all elements
Definition
The sort() algorithm is defined in the standard header <algorithm> and in the nonstandard backward-compatibility header <algo.h>.Interface
#include <algorithm> template < class RandomAccessIterator > void sort( RandomAccessIterator first, RandomAccessIterator last ); template < class RandomAccessIterator, class Predicate > void sort( RandomAccessIterator first, RandomAccessIterator last, Predicate comp );Parameters:
| Parameter | Description |
|---|---|
| first | A random-access iterator addressing the position of the first element in the range to be sorted |
| last | A random-access iterator addressing the position one past the final element in the range to be sorted |
| comp | User-defined predicate function object that defines the comparison criterion to be satisfied by successive elements in the ordering. A binary predicate takes two arguments and returns true when satisfied and false when not satisfied |
Description
Sort function sorts the elements in the range[first, last) in ascending order.
The first version uses operator< to compare the elements, the second version uses the given comparison function comp.Example:
Example - sort algorithm
Problem
The following example demonstrates the use of sort().
Workings
#include <vector> #include <algorithm> #include <functional> #include <iostream> using namespace std; // return whether first element is greater than the second bool userdefgreater(int elem1, int elem2) { return elem1 > elem2; } int main() { vector <int> vec1; // container vector <int>::iterator Iter1; // iterator int k; for (k = 0; k <= 15; k++) vec1.push_back(k); random_shuffle(vec1.begin(), vec1.end()); cout <<"Original random shuffle vector vec1 data:\n"; for (Iter1 = vec1.begin(); Iter1 != vec1.end(); Iter1++) cout <<*Iter1<<" "; cout <<endl; sort(vec1.begin(), vec1.end()); cout <<"\nSorted vector vec1 data:\n"; for (Iter1 = vec1.begin(); Iter1 != vec1.end(); Iter1++) cout <<*Iter1<<" "; cout <<endl; // to sort in descending order, specify binary predicate sort(vec1.begin(), vec1.end(), greater<int>()); cout <<"\nRe sorted (greater) vector vec1 data:\n"; for (Iter1 = vec1.begin(); Iter1 != vec1.end(); Iter1++) cout <<*Iter1<<" "; cout <<endl; // a user-defined binary predicate can also be used sort(vec1.begin(), vec1.end(), userdefgreater); cout <<"\nUser defined re sorted vector vec1 data:\n"; for (Iter1 = vec1.begin(); Iter1 != vec1.end(); Iter1++) cout <<*Iter1<<" "; cout <<endl; return 0; }
Solution
Output:
Original random shuffle vector vec1 data:
12 1 9 2 0 11 7 3 4 15 8 5 14 13 10 6 Sorted vector vec1 data:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Re sorted (greater) vector vec1 data:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 User defined re sorted vector vec1 data:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
12 1 9 2 0 11 7 3 4 15 8 5 14 13 10 6 Sorted vector vec1 data:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Re sorted (greater) vector vec1 data:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 User defined re sorted vector vec1 data:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
References
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