The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include "algostuff.hpp"
using namespace std;
bool differenceOne (int elem1, int elem2)
{
return elem1 + 1 == elem2 || elem1 - 1 == elem2;
}
int main()
{
// source data
int source[] = { 1, 4, 4, 6, 1, 2, 2, 3, 1, 6, 6, 6, 5, 7,
5, 4, 4 };
// initialize coll with elements from source
list<int> coll;
copy(begin(source), end(source), // source
back_inserter(coll)); // destination
PRINT_ELEMENTS(coll);
// print elements with consecutive duplicates removed
unique_copy(coll.cbegin(), coll.cend(), // source
ostream_iterator<int>(cout," ")); // destination
cout << endl;
// print elements without consecutive entries that differ by one
unique_copy(coll.cbegin(), coll.cend(), // source
ostream_iterator<int>(cout," "), // destination
differenceOne); // duplicates criterion
cout << endl;
}