C++ Fundamentals: Understanding the Basics

Vector erase() in C++

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Vector erase() in C++

    C++ Language: An Overview

    Difference Between C and C++ Programming Languages

    Understanding Loops in C++

    Command Line Arguments in C++

    Learn about Strings in C++

    Initializing Vectors in C++

    Understanding Vectors in C++

    Understanding 2D Vectors in C++

    Vector erase() in C++

    Understanding Templates in C++

    A quick guide to Unordered Map in C++

    Left Shift Operator in C++

    Bitwise Operators In C++

    rand() Function in C++

    Static variables in C++

Introduction

A single element at a specific index or a group of items between two start and finish indices can be deleted using the erase() method.

Syntax

The erase() function's syntax is as follows to delete an element at a given index:

iterator erase( const_iterator index );

Iterator erase(const iterator start, const iterator end) is the syntax for the erase() function, which removes all the items from a particular start index to the end index. Please take note that const iterator must be specified as the position of the element to be eliminated.

Examples

Element from Vector Removed at a Specific Index

In the following C++ program, we initialize a vector name with five elements, and then remove the element at index=3.

Code

#include <iostream>
#include <vector>
using namespace std;
int main() {
    vector<string> names{ "apple", "banana", "cherry", "mango" , "orange" };
    names.erase( std::next(names.begin(), 2) );
    for ( string x: names ) {
        cout << x << endl;
    }
}

Output


apple

banana

mango

orange

write your code here: Coding Playground

Remove the specified range of elements from the vector. [start, end)

In the C++ program that follows, we create a vector named with five entries before removing the elements starting at index=2 and continuing until index=4.

Code

#include <iostream>
#include <vector>
using namespace std;
int main() {
    vector<string> names{ "apple", "banana", "cherry", "mango" , "orange" };
    int start = 2;
    int end = 4;
    names.erase( std::next(names.begin(), start),
                std::next(names.begin(), end) );
    for ( string x: names ) {
        cout << x << endl;
    }
}

Output


apple

banana

orange

write your code here: Coding Playground

Conclusion

In this C++ lesson, we learnt how to utilize the erase() function's syntax to delete a specific element from a location or a group of items that are present in a certain index range.