vector::clear()

vector::erase()

The clear() function is used to remove all the elements of the vector container, thus making it size 0.

Syntax:

vector_name.clear()

Parameters: No parameters are passed.

Result: All the elements of the vector are removed (or destroyed).

Example:

Input:    myvector= {1, 2, 3, 4, 5};
        myvector.clear();

Output:    myvector= {}

C++

// C++ program to demonstrate
// Implementation of clear() function
#include <iostream>
#include <vector>
using namespace std;
 
int main()
{
    vector<int> myvector;
    myvector.push_back(1);
    myvector.push_back(2);
    myvector.push_back(3);
    myvector.push_back(4);
    myvector.push_back(5);
 
    // Vector becomes 1, 2, 3, 4, 5
 
    myvector.clear();
    // vector becomes empty
 
    // Printing the vector
    for (auto it = myvector.begin(); it != myvector.end();
         ++it)
        cout << ' ' << *it;
    return 0;
}

Output

No Output

Time Complexity: O(N)
Auxiliary Space: O(1)
All elements are destroyed one by one.

Errors and Exceptions

It has a no exception throw guarantee.
It shows an error when a parameter is passed.

vector erase() and clear() in C++

Prerequisite: Vector in C++

Vectors are the same as dynamic arrays with the ability to resize themselves automatically when an element is inserted or deleted, with their storage being handled automatically by the container.

Tags:

#cpp-advanced #CPP-Library #cpp-vector #STL #C++ #CPP #STL

vector::erase()

vector::clear()

C++

Errors and Exceptions

vector erase() and clear() in C++

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