How to clear a list in C++?

How to clear a list in C++?

 

Lists are containers employed in C++ to store data in a non-contiguous fashion, Usually, Arrays and Vectors are contiguous in nature, hence the insertion and deletion operations are costlier as compared to the insertion and deletion selection in Lists.

list::clear()

clear() function is used to eliminate all the elements of the list container, thus making it size 0.

 

Syntax :

listname.clear()

Parameters :

No parameters are passed.

Result :

All the elements of the list are removed

 

Examples –

Input: list{2, 4, 6, 8, 10};

         list.clear();

Output : list{}

Input : list{};

         list.clear();

Output : list{}

Errors and Exceptions

1. This has a no exception throw guarantee.

2. Displays error when a parameter is passed.

 

// CPP program to explanation (Clear a list in C++)

// execution of clear() function 

 

#include <iostream> 

#include <list> 

using namespace std; 

  

int main() 

    list<int> mylist{ 2, 4, 6, 8, 10 }; 

  

    mylist.clear(); 

    // List becomes empty 

  

    // Printing the list 

    for (auto it = mylist.begin(); it != mylist.end(); ++it) 

        cout << ‘ ‘ << *it; 

    return 0; 

Output:

None

 

You May Also Read This – 

Various ways to clear a list in Python

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