C++ STL vector, swap() code example

 

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info: none

To do: Using the C++ swap() to exchange the elements of two vectors in C++ programming

To show: How to use the C++ vector, swap() to exchange the elements of two vectors in C++ programming

 

// C++ STL vector, swap()

#include <vector>

#include <iostream>

using namespace std;

 

int main(void)

{

// vector containers

vector <int> vec1, vec2;

unsigned int i;

 

// push/insert data

vec1.push_back(4);

vec1.push_back(7);

vec1.push_back(2);

vec1.push_back(12);

 

// print the data and do some operations

cout<<"vec1 vector data: ";

for(i=0; i<vec1.size(); ++i)

cout<<vec1[i]<<' ';

cout<<endl;

 

// push more data

vec2.push_back(11);

vec2.push_back(21);

vec2.push_back(30);

 

// print the data

cout<<"vec2 vector data: ";

for(i=0; i<vec2.size(); ++i)

cout<<vec2[i]<<' ';

cout<<endl;

cout<<"The number of elements in vec1 = "<<vec1.size()<<endl;

cout<<"The number of elements in vec2 = "<<vec2.size()<<endl;

cout<<endl;

 

// do the swapping

cout<<"Operation: vec1.swap(vec2);"<<endl<<endl;

vec1.swap(vec2);

cout<<"The number of elements in v1 = "<<vec1.size()<<endl;

cout<<"The number of elements in v2 = "<<vec2.size()<<endl;

cout<<"vec1 vector data: ";

for(i=0; i<vec1.size(); ++i)

cout<<vec1[i]<<' ';

cout<<endl;

cout<<"vec2 vector data: ";

for(i=0; i<vec2.size(); ++i)

cout<<vec2[i]<<' ';

cout<<endl;

return 0;

}

 

Output examples:

 

vec1 vector data: 4 7 2 12

vec2 vector data: 11 21 30

The number of elements in vec1 = 4

The number of elements in vec2 = 3

Operation: vec1.swap(vec2);

The number of elements in v1 = 3

The number of elements in v2 = 4

vec1 vector data: 11 21 30

vec2 vector data: 4 7 2 12

Press any key to continue . . .

 

 

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