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C++ Vector Library - swap() Function
Description
The C++ function std::vector::swap() exchanges the contents of two vector.
Declaration
Following is the declaration for std::vector::swap() function form std::vector header.
template <class T, class Alloc> void swap (vector<T,Alloc>& v1, vector<T,Alloc>& v2);
Parameters
v1 − First vector container.
v2 − Second vector container.
Return value
None.
Exceptions
This function never throws exception.
Time complexity
Linear i.e. O(1)
Example
The following example shows the usage of std::vector::swap() function.
#include <iostream> #include <vector> using namespace std; int main(void) { vector<int> v1 = {1, 2, 3, 4, 5}; vector<int> v2 = {10, 20, 30}; cout << "Contents of vector v1 before swap operation" << endl; for (int i = 0; i < v1.size(); ++i) cout << v1[i] << endl; cout << "Contents of vector v2 before swap operation" << endl; for (int i = 0; i < v2.size(); ++i) cout << v2[i] << endl; swap(v1, v2); cout << "Contents of vector v1 after swap operation" << endl; for (int i = 0; i < v1.size(); ++i) cout << v1[i] << endl; cout << "Contents of vector v2 after swap operation" << endl; for (int i = 0; i < v2.size(); ++i) cout << v2[i] << endl; return 0; }
Let us compile and run the above program, this will produce the following result −
Contents of vector v1 before swap operation 1 2 3 4 5 Contents of vector v2 befor swap operation 10 20 30 Contents of vector v1 after swap operation 10 20 30 Contents of vector v2 after swap operation 1 2 3 4 5
vector.htm
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