1: //iter_swap1a.cpp
3: #include <iostream>
4: #include <vector>
5: #include <algorithm>
6: using namespace std;
8: int main()
9: {
10: cout << "\nThis program illustrates the use of the STL iter_swap() "
11: "algorithm to swap\ninteger values that are pointed to by two "
12: "different iterators that may point\ninto the same vector of "
13: "integers, or into two different vectors of integers.";
14: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
16: int a1[] = {1, 2, 3, 4, 5};
17: vector<int> v1(a1, a1+5);
18: cout << "\nHere are the contents of v1:\n";
19: for (vector<int>::size_type i=0; i<v1.size(); i++)
20: cout << v1.at(i) << " ";
21: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
23: int a2[] = {2, 4, 6, 8, 10};
24: vector<int> v2(a2, a2+5);
25: cout << "\nHere are the contents of v2:\n";
26: for (vector<int>::size_type i=0; i<v2.size(); i++)
27: cout << v2.at(i) << " ";
28: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
30: cout << "\nFirst we swap the end values in v1.";
31: iter_swap(v1.begin(), v1.end()-1);
32: cout << "\nHere are the contents of the revised v1:\n";
33: for (vector<int>::size_type i=0; i<v1.size(); i++)
34: cout << v1.at(i) << " ";
35: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
37: cout << "\nThen we swap the middle values in v1 and v2.";
38: iter_swap(v1.begin()+2, v2.begin()+2);
39: cout << "\nHere are the contents of the revised v1:\n";
40: for (vector<int>::size_type i=0; i<v1.size(); i++)
41: cout << v1.at(i) << " ";
42: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
43: cout << "\nHere are the contents of the revised v2:\n";
44: for (vector<int>::size_type i=0; i<v2.size(); i++)
45: cout << v2.at(i) << " ";
46: cout << "\nPress Enter to continue ... "; cin.ignore(80, '\n');
47: }