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Stable sort - Sort all elements in the range [first, last) into ascending order.

Stable sort - Sort all elements in the range [first, last) into ascending order.


stable_sort
	
 
Header
<algorithm>

template<class RandomAccessIterator>
void sort(RandomAccessIterator first, RandomAccessIterator last)

Sort all elements in the range [first, last) into ascending order. The relative order of equal elements is preserved.

The non-predicate version uses operator< for comparison.

template<class RandomAccessIterator, class BinaryPredicate>
void sort(RandomAccessIterator first, RandomAccessIterator last, BinaryPredicate pr)

Sort all elements in the range [first, last) into ascending order. The relative order of equal elements is preserved.

The predicate version uses the predicate function pr for comparison.


Sample

#pragma warning(disable : 4786)

#include <algorithm>
#include <iostream>
#include <functional>

int main()
{
	int array[6] = { 102, 425, 102, 34, 87, 34} ;

	std::ostream_iterator<int> intOstreamIt(std::cout, ", ") ;

	std::cout << "using non-predicate stable_sort" << std::endl ;

	std::cout << "\n\narray before sorting = " ;
	std::copy(array, array+6, intOstreamIt) ;
	std::cout << std::endl ;
	
	//stable_sort non-predicate version
	std::stable_sort(array, array+6) ;

	std::cout << "\n\narray after sorting = " ;
	std::copy(array, array+6, intOstreamIt) ;
	std::cout << std::endl ;

	std::random_shuffle(array, array+6) ;

	std::cout << "using predicate stable_sort" << std::endl ;

	std::cout << "\n\narray after random_shuffle = " ;
	std::copy(array, array+6, intOstreamIt) ;
	std::cout << std::endl ;
	
	//sort predicate version
	std::stable_sort(array, array+6, std::less<int>()) ;

	std::cout << "\n\narray after sorting = " ;
	std::copy(array, array+6, intOstreamIt) ;
	std::cout << std::endl ;

	return 0 ;
}

Program Output

using non-predicate stable_sort


array before sorting = 102, 425, 102, 34, 87, 34,


array after sorting = 34, 34, 87, 102, 102, 425,
using predicate stable_sort


array after random_shuffle = 102, 102, 34, 87, 425, 34,


array after sorting = 34, 34, 87, 102, 102, 425,