C++/STL Algorithms Modifying sequence operations/swap
Содержание
Illustrating the generic swap algorithm
#include <iostream>
#include <cassert>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
vector<int> vector1(100, 1), vector2(200, 2);
swap(vector1, vector2);
for(int i=0;i<vector1.size();i++){
cout << vector1[i] ;
}
cout << "\n\n\n\n\n";
for(int i=0;i<vector2.size();i++){
cout << vector2[i] ;
}
return 0;
}
/*
22222222222222222222222222222222222222222222222222222222222222222222222222222222
22222222222222222222222222222222222222222222222222222222222222222222222222222222
2222222222222222222222222222222222222222
11111111111111111111111111111111111111111111111111111111111111111111111111111111
11111111111111111111
*/
Illustrating the generic swap algorithm: swap two integers
#include <iostream>
#include <cassert>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
int high = 250, low = 0;
swap(high, low);
cout << high << " ";
cout << low;
return 0;
}
/*
0 250
*/
Swap elements at locations 0 and 1 of an array
#include <iostream>
using std::cout;
using std::endl;
#include <algorithm>
#include <iterator>
int main()
{
int a[ 10 ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
std::ostream_iterator< int > output( cout, " " );
cout << "Array a contains:\n ";
std::copy( a, a + 10, output );
std::swap( a[ 0 ], a[ 1 ] );
cout << "\nArray a after swapping a[0] and a[1] using swap:\n ";
std::copy( a, a + 10, output ); // display array a
cout << endl;
return 0;
}
/*
Array a contains:
1 2 3 4 5 6 7 8 9 10
Array a after swapping a[0] and a[1] using swap:
2 1 3 4 5 6 7 8 9 10
*/
Swap second and fourth element in a vector
/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>
using namespace std;
int main()
{
// create empty vector for strings
vector<string> sentence;
// reserve memory for five elements to avoid reallocation
sentence.reserve(5);
// append some elements
sentence.push_back("Hello,");
sentence.push_back("how");
sentence.push_back("are");
sentence.push_back("you");
sentence.push_back("?");
// swap second and fourth element
swap (sentence[1], sentence[3]);
// print elements separated with spaces
copy (sentence.begin(), sentence.end(),
ostream_iterator<string>(cout," "));
cout << endl;
}
/*
Hello, you are how ?
*/